78-86 Flashcards
(190 cards)
1
Q
The overall order of reaction for the elementary reaction A + 2B -> C is
A. 0
B. 1
C. 2
D. 3
A
2
Q
A reaction is known to be first order in A. A straight line will be obtain ed by plotting
A. log C A versus time
B. log C A versus reciprocal time
C. C A versus time
D. 1/C A versus time
A
A. log C A versus time
3
Q
Falling drops of water becomes spherical due to
A. surface tension
B. viscosity
C. compressibility
D. capillarity
A
A. surface tension
4
Q
When evaporation occurs, the liquid that remains is cooler because
A. the pressure on the liquid decrease
B. the slowest molecules remain behind
C. the volume of the liquid decreases
D. the fastest molecules remain behind
A
B. the slowest molecules remain behind
5
Q
When a volume of air is heated,
A. the amount of water vapor it can hold does not change
B. it can hold less water vapor
C. its relative humidity to increase
D. it can hold more water vapor
A
D. it can hold more water vapor
6
Q
Cooling saturated air causes
A. its ability to take up water vapor to increase
B. some of its water content to condense out
C. its relative humidity to increase
D. its relative humidity to decrease
A
B. some of its water content to condense out
7
Q
Malt is produced from barley by
A. steeping, germination, and kilning
B. mashing, addition of hops, and fermentation
C. steeping, mashing, and lagering
D. mashing, kilning, and fermentation
A
A. steeping, germination, and kilning
8
Q
A mechanical pressure gauge which indicates pressure by the amount of deflection under internal pressure of an oval tube bent in an arc
of a circle and closed at one end.
A. diaphragm gauge
B. Bourdon-tube gauge
C. compound gauges
D. manometer
A
B. Bourdon-tube gauge
8
Q
If the Reynolds number is less than 2100, what is the classification of the fluid flow?
A. laminar liquid
B. critical flow
C. turbulent flow
D. uniform flow
A
A. laminar liquid
8
Q
It is a dimensionless group which is proportional to the ratio of inertial force and surface-tension force.
A. Bond number
B. Froude number
C. Weber number
D. Power number
A
C. Weber number
9
Q
A plot of shear stress versus shea r rate for a fluid in simple shear flow.
A. stress-strain diagram
B. rheogram
C. histogram
D. anagram
A
B. rheogram
10
Q
Which of the following fluid flow is characterized by erratic, small whirlpool-like circles?
A. steady flow
B. laminar flow
C. uniform flow
D. turbulent flow
A
D. turbulent flow
11
Q
How do you classify liquids that vaporized easily?
A. ideal liquid
B. saturated liquid
C. volatile liquid
D. osmotic liquid
A
C. volatile liquid
12
Q
What do you call the power required to deliver a given quantity of a fluid against a given head with no losses in the pump?
A. wheel power
B. brake power
C. hydraulic power
D. specific power
A
C. hydraulic power
13
Q
Which of the following refers to the measure of a fluid’s sensitivity to change in viscosity with changes in temperature?
A. viscosity index
B. viscosity ratio
C. viscosity factor
D. coefficient of viscosity
A
A. viscosity index
14
Q
Viscosities can change with time assuming all other conditions to be constant. If the viscosities increases with time up to a finite value
how do you call the fluid?
A. pseudoplastic fluid
B. colloidal fluid
C. rheopectic fluid
D. thixotropic fluid
A
C. rheopectic fluid
15
Q
A machine or device for moving incompressible fluid is commonly known as
A. compressor
B. motor
C. pump
D. turbine
A
C. pump
16
Q
The breakdown of glucose to products such as lactic acid or ethanol.
A. glycolysis
B. glucolysis
C. mitosis
D. photosynthesis
A
A. glycolysis
17
Q
If the pressure of the fluid suction line drops, some liquid flashes into vapors. The flashing is called
A. channeling
B. cavitation
C. flooding
D. vaporization
A
B. cavitation
18
Q
An isotope of hydrogen is
A. neptunium
B. plutonium
C. thorium
D. tritium
A
D. tritium
19
Q
Crystallization occurs in a solution that is
A. concentrated
B. unsaturated
C. supersaturated
D. saturated
A
C. supersaturated
20
Q
It is used primarily in operations requiring high flame temperature, such as welding and metal cutting.
A. coal gas
B. acetylene
C. blue water gas
D. carbureted gas
A
B. acetylene
21
Q
It is the variation of temperature with height above the ground.
A. inversion aloft
B. ground-level inversion
C. lapse rate
D. greenhouse effect
A
C. lapse rate
22
Q
It is the portion of the coal which when heated in the absence of air under prescribed conditions is liberated as gases or vapors.
A. fixed carbon
B. volatile matter
C. total carbon
D. net hydrogen
A
B. volatile matter
23
The heating value obtained when the water is not condensed.
A. high heating value
B. low heating value
C. calorific value
D. gross calorific value
B. low heating value
24
A type of valve which permits only on e direction of flow.
A. gate valve
B. butterfly valve
C. globe valve
D. check valve
D. check valve
25
One common problem in conveyors is to cut out the driving force when a conveyor jams _____ devices are often used, as are electrical
controls which cut power to the drive motor.
A. torque limiting
B. holdback
C. brake
D. cleaners
A. torque limiting
26
It is an algebraic expression for the dynamic relation between a selected input and output of the process model.
A. Laplace transform
B. complex numbers
C. transfer function
D. quadratic equation
C. transfer function
27
It is the time the process output takes to first the new steady-state values.
A. rise time
B. settling time
C. overshoot
D. decay ratio
A. rise time
28
A type screening equipment operated with a shaking motion, a long stroke at low frequency.
A. vibrating screens
B. reciprocating screens
C. oscillating screens
D. revolving screens
B. reciprocating screens
29
A device used to the classification of particles size ranges below 10 micrometer.
A. thickeners
B. hydraulic jigs
C. centrifuge
D. tables
C. centrifuge
30
Which of the following media can trap particles of size 0.005 micrometer?
A. woven wire
B. membranes
C. woven cloth
D. cellulose
B. membranes
31
Also known as flash dryers
A. spray dryers
B. pneumatic dryers
C. rotary dryers
D. tray dryers
B. pneumatic dryers
32
Hydrogen sulfide is removed from water by contacting the solution with warm air. The operation is
A. distillation
B. leaching
C. absorption
D. stripping
D. stripping
33
Sulfur is undesirable is petroleum because
A. it cause engine knocking
B. it poisons the catalyst in the refining process
C. it increases the boiling point of fuel
D. all that are mentioned
A. it cause engine knocking
34
Materials added to detergent formulation to enhance cleaning performance by exhibiting synergistic cleaning effects with surfactant.
A. fillers
B. brighteners
C. builders
D. perfume
C. builders
35
An inherent disadvantage of this control system is that it results in continuous cycling of the controlled variable and thus produces
excessive wear in the final element.
A. on-off control
B. P-only control
C. Pl-only control
D. PID control
A. on-off control
36
Plasticizers are added to paints to
A. make it corrosion resistant
B. give elasticity and prevent cracking of the film
C. make glossy surface
D. increase atmospheric oxidation
B. give elasticity and prevent cracking of the film
37
Molasses is the starting material for
A. alcohol
B. essential oil
C. fatty acids
D. ether
A. alcohol
38
Third aspect in plant design.
A. environment
B. education
C. religion
D. morality
A. environment
39
Under the same temperature gradient across various metal plates of the same thickness, the heat conducted per unit surface area will be
more across
A. iron
B. nickel
C. copper
D. lead
C. copper
40
A dryer in which the solid is directly exposed to a hot gas, usually air is called
A. indirect dryer
B. adiabatic dryer
C. circulating dryer
D. continuous dryer
B. adiabatic dryer
41
Metallurgical processes that utilizes high temperature are collective called
A. hydrometallurgy
B. pyrometallurgy
C. electrometallurgy
D. alloying
B. pyrometallurgy
42
It is the lowest temperature at which the material will ignite from an open flame.
A. flash point
B. flammability limit
C. autoignition temperature
D. flame traps
A. flash point
43
It is a sudden, catastrophic, release of energy, causing a pressure wave (blast wave)
A. ignition
B. deflagration
C. detonation
D. explosion
D. explosion
44
The differential height between two points through which a fluid has to be transported is the
A. pressure head
B. dynamic head
C. velocity head
D. potential head
D. potential head
45
BET apparatus is used to determine the
A. Specific surface of porous catalyst
B. Pore diameter
C. Pore size distribution
D. Porosity of the catalyst bed
A. Specific surface of porous catalyst
46
An elementary reaction has k=0.18 L /mol-s, the order of the reaction is
A. zero
B. first
C. second
D. third
C. second
47
What do you call a system in which there is a flow of matter through the boundary? This system usually encloses the device that involves mass flow, such as: compressor, turbine, or nozzle.
A. closed system
B. open system
C. isolated system
D. all of these
B. open system
48
What is the entropy of a pure substance at a temperature of absolute zero?
A. unity
B. zero
C. infinity
D. 100
B. zero
49
An amorphous carbon that has been treated with steam and heat until it has a very great affinity for absorbing many materials .
A. lampblack
B. carbon black
C. activated carbon
D. graphite
C. activated carbon
50
It pertains to the production and use of extreme cold at temperature below-100oC
A. cryogenics
B. air conditioning
C. low temperature industry
D. refrigeration
A. cryogenics
51
It is very finely divided, essentially nonporous type of carbonaceous material which is produced in a precisely controlled pyrolytic
petrochemical process.
A. carbon black
B. soot
C. anthracite
D. bituminous
A. carbon black
52
Which acid is used in removing ink spots?
A. oxalic acid
B. citric acid
C. tartaric acid
D. formic acid
A. oxalic acid
53
A bet saddle is used so that
A. one can easily ride a horse
B. to increase mass transfer rate
C. the one with the higher melting point
D. the one with the higher boiling point
B. to increase mass transfer rate
54
In binary distillation, the first component to condense in the distillate flask will be
A. the one with the lower melting point
B. the one with the lower boiling point
C. the one with higher melting point
D. the one with the higher boiling point
D. the one with the higher boiling point
55
To increase the life an incandescent lamp it is
A. filled with neon gas
B. filled with argon gas
C. filled with CO2 gas
D. evacuated
B. filled with argon gas
56
Lanolin is widely used in cosmetics, derived from ____.
A. cottonseed oil
B. coconut oil
C. sheep’s wool
D. palm oil
C. sheep’s wool
57
Compounds added to the glass to give it the while opaque appearance so characteristics of vitreous enamels.
A. fluxes
B. opacifiers
C. electrolytes
D. whiteners
58
A pure finely divided calcium carbonate prepared by wet grinding and levitating natural chalk.
A. flourspar
B. putty
C. lactate
D. whiting
D. whiting
59
Ratio of the maximum controllable flow to the minimum controllable flow.
A. rangeability
B. zero-span ratio
C. hysteresis
D. installed flow characteristics
A. rangeability
60
Which of the following is true if the resulting combustible lost in refuse is coked coal?
A. has lost only its moisture content
B. has lost both moisture and VCM content
C. has FC and VCM as its main constituent
D. the FC/VCM in green coal is equal to FC/VCM in refuse
B. has lost both moisture and VCM content
61
Calorific value as determined by bomb calorimeter is
A. higher calorific value at constant volume
B. lower calorific value at constant pressure
C. gross calorific value at constant pressure
D. net calorific value at constant volume
A. higher calorific value at constant volume
62
Coolers and boilers are ordinarily operated at ______ condition.
A. isobaric
B. isenthalpic
C. isothermal
D. isentropic
A. isobaric
63
Otto cycle consist of
A. two isentropic and two constant volume processes
B. two isentropic and two constant pressure processes
C. two adiabatic and two isothermal processes
D. two isothermal and two constant volume process
A. two isentropic and two constant volume processes
64
Very tall packed towers are divided into series of beds to
A. reduce the over-all pressure drop
B. reduce liquid hold-up
C. avoid channeling
D. avoid flooding
C. avoid channeling
65
In the constant rate period of the rate of drying curve for batch drying
A. cracks develop on the surface of t he solid
B. surface evaporation of unbound moisture occurs
C. rate of drying decrease abruptly
D. none of these
B. surface evaporation of unbound moisture occurs
66
An equation relating the temperature dependence of the equilibrium constant to the enthalpy change in the reaction.
A. rate equation
B. Arrhenius equation
C. Van’t Hoff equation
D. Raoult’s law
C. Van’t Hoff equation
67
The statement that states that the entropy of vaporization for a liquids is approximately 88 J/mol-K or 21 cal/mol-K.
A. Trouton’s rule
B. mixing rule
C. Gibb’s phase rule
D. Third law of thermodynamics
A. Trouton’s rule
68
The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called.
A. Operational yield
B. Relative yield
C. Selectivity
D. None of these
C. Selectivity
69
Which of the following is a unit of kinematic viscosity
A. centipoise
B. pascal-second
C. centistokes
D. lb/ft-s
C. centistokes
70
Bear pump
A. is a positive displacement pump
B. is a non-positive displacement pump
C. is a centrifugal pump
D. can be started with delivery valve closed
A. is a positive displacement pump
71
Rittinger’s crushing law states that
A. Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
B. Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
C. Work required in crushing is proportional to the new surface created
D. for a given machine and feed, crushing efficiency is dependent on the sizes of feed and product
C. Work required in crushing is proportional to the new surface created
72
This is also known as the volume fraction of the voids in packed beds.
A. porosity
B. Superficial velocity
C. Specific volume
D. sphericity
A. porosity
73
Diatomaceous earth is
A. explosive
B. filter aid
C. filter medium
D. none of these
B. filter aid
74
Mass transfer in a flowing fluid may be correlated by
A. Sherwood, Nusselt & Reynold’s number
B. Peclet, Reynold’s & Schmidt number
C. Sherwood, Reynolds & Schmidt number
D. Prandtl, Schimdt & Reynolds number
C. Sherwood, Reynolds & Schmidt number
75
Which of the following ratios describe Reynolds number?
A. inertial force/viscous forces
B. buoyant forces/inertial forces
C. drag forces/buoyant forces
D. viscous forces/drag forces
A. inertial force/viscous forces
75
It is frequently caused by crystallization of a material whose solubility at the wall temperature is lower than at the bulk liquid temperature.
A. scaling
B. salting
C. fouling
D. boiling
A. scaling
76
Which of the following has the highest thermal conductivity
A. gasoline
B. glycerin
C. water
D. alcohol
C. water
77
Heat transfer in turbulent flow may be described through an empirical equation correlating
A. Nusselt, Stanton and Reynold’s numbers
B. Peclet, Stanton and Prandtl numbers
C. Nusselt, Prandtl and Reynold’s numbers
D. Schmidt, Peclet, and friction numbers
C. Nusselt, Prandtl and Reynold’s numbers
78
The boiling point of a given solution is a linear function of the boiling point of pure water at the same pressure.
A. Steffi’s rule
B. Duhring’s rule
C. Haviuck rule
D. McCabe Thiele rule
B. Duhring’s rule
79
Schmidt number is
A. μ/ρD AD
B. Re.Pe
C. Sh x Pe
D. Re/Pe
A. μ/ρD AD
80
Operating velocity in a packed tower is usually
A. half the flooding velocity
B. equal to flooding velocity
C. twice the flooding velocity
D. more than the flooding velocity
A. half the flooding velocity
81
Flooding in a column results due to
A. high pressure drop
B. low pressure drop
C. low velocity of the liquid
D. high temperature
A. high pressure drop
82
Which of the following provides maximum contacts surface for a liquid-vapor system?
A. packed tower
B. sieve-plate column
C. bubble-cup plate column
D. wetted wall column
A. packed tower
83
Weeping in distillation or absorption column
A. increase tray efficiency
B. results due to low gas velocity
C. provides larger surface for mass transfer
D. is due to bubble cups
B. results due to low gas velocity
84
Condensation of a vapor-gas mixture just begins when______. Note: p = partial pressure of the vapor and P = vapor pressure of the
liquid.
A. ρ=P
B. ρ>P
C. ρ
=P
A. ρ=P
85
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?
A. dry bulb temperature
B. wet bulb temperature
C. absolute humidity
D. dew point
B. wet bulb temperature
86
Percentage saturation is _______ the relative saturation.
A. always smaller than
B. always greater than
C. not related to
D. none of these
A. always smaller than
87
.Wet bulb and dry bulb temperatures become identical at
A. 100% saturation curve
B. 78% saturation curve
C. 50% saturation curve
D. 10% saturation curve
A. 100% saturation curve
88
Extraction of coffee from its seeds is done by
A. liquid-liquid extraction
B. extractive distillation
C. steam distillation
D. leaching
D. leaching
89
Which product is produced commercially by the Haber process?
A. sulfuric acid
B. ammonia
C. propane
D. calcium
B. ammonia
90
Which of the following is pearl ash?
A. Na2CO3
B. K2CO3
C. Al2O3
D. CaO
B. K2CO3
91
Which of the following is also known as black diamond?
A. bort
B. fullerenes
C. carbonado
D. carbon fibers
C. carbonado
92
The unit operation for separating a particular gaseous component from a mixture of gases due to difference in solubility of the gases in a
liquid phase is
A. adsorption
B. absorption
C. extraction
D. distillation
B. absorption
93
It is characterized by simple vegetative bodies from which reproductive structures are elaborated. It contains no chlorophyll and therefore
requires sources of complex organic molecules.
A. algae
B. fungi
C. virus
D. protozoa
B. fungi
94
It is the most abundant metal of the earth’s crust.
A. iron
B. aluminum
C. lithium
D. sodium
B. aluminum
95
It is commonly applied to any process used to effect partial or complete demineralization of highly saline waters such as seawater (35,000
ppm of dissolved salts) and brackish waters.
A. purification
B. desalting
C. deaeration
D. electrodialysis
B. desalting
96
It converts solar energy into electricity directly.
A. electrolytic cell
B. electrochemical cell
C. photovoltaic cell
D. fuel cell
C. photovoltaic cell
97
It is usually applied to cooling below ambient temperature.
A. air conditioning
B. refrigeration
C. thermal conduction
D. heat transfer
B. refrigeration
98
The device that cause the process to provide the output.
A. sensor
B. transmitter
C. adaptor
D. actuator
D. actuator
98
An unwanted input signal that affects the system’s output signal.
A. disturbance signal
B. sensor signal
C. error signal
D. controlled variable signal
A. disturbance signal
99
The amount of radiation emitted in all directions and over all wavelengths by a perfect emitter is proportional to the fourth power of the
absolute temperature of the emitter. This is the statement of
A. Stefan-Boltzmann law
B. Kirchhoff’s law
C. Wien’s Law
D. Planck’s Law
A. Stefan-Boltzmann law
100
An ideal surface that absorbs all incident radiation regardless of wavelength and direction and is also considered as a perfect emitter is
referred to as a
A. gray body
B. black body
C. pin hole
D. black hole
B. black body
101
The reason for insulating the pipes is
A. they may not break under pressure
B. capacity to withstand pressure is increased
C. there is minimum corrosion
D. heat loss from the surface is minimized
D. heat loss from the surface is minimized
102
A heat transfer device that is normally used to liquefy vapors is
A. evaporator
B. condenser
C. boiler
D. cooler
B. condenser
103
The separation of a dilute slurry or suspension by gravity settling into a clear fluid and slurry or suspension by gravity settling into a clear
fluid and a slurry of high solids content is called.
A. thickening
B. classification
C. sorting
D. centrifugation
A. thickening
104
Moisture in a solid exerting an equilibrium vapor pressure equal to that of the pure liquid at the same temperature is
A. unbound moisture
B. free moisture
C. Critical moisture
D. bound moisture
A. unbound moisture
105
Liquid-fluid extraction is possible when there is a difference in this property of a given solute between two immiscible solvents.
A. viscosity
B. solubility
C. vapor pressure
D. temperature
B. solubility
106
A space-time of 3 hours for a flow reactor means that
A. the time required to process one reactor volume of feed (measured a t specified conditions) is 3 hour
B. three reactor volumes of feed can be processed every hour
C. it takes three hours to dump the entire volume of the reaction with feed
D. conversion is cent per cent after three hours
A. the time required to process one reactor volume of feed (measured a t specified conditions) is 3 hour
107
This is an operation whereby components of a liquid mixture are separated by boiling because of their difference in vapor pressure.
A. distillation
B. drying
C. evaporation
D. leaching
A. distillation
108
The _____ efficiency is the efficiency for a single plate of distillation column.
A. specific
B. point
C. murphree
D. local
A. specific
109
Moisture contain by a substance in excess of the equilibrium moisture is called
A. unbound moisture
B. free moisture
C. critical moisture
D. bound moisture
B. free moisture
110
The Bond work index for a mesh-of-grind of 200 mesh for a rock consisting mainly of quartz is 17.5 kWh/ton. How much power (in kW) is needed to reduce the material in a wet-grinding ball mill from an 80 percent passing size of 1100 μm to an 80 percent passing size of 80μm at a capacity of 10 to per hour?
A. 120 kW
B. 143 kW
C. 176 kW
D. 200 kW
B. 143 kW
111
Calculate the terminal velocity for a spherical droplets of coffee extract, 400 microns in diameter, falling through air. The specific gravity of coffee extract is 1.03 and the air is 300oF.
A. 3.57 ft/s
B. 8.5 ft/s
C. 0.56 ft/s
D. 10.4 ft/s
A. 3.57 ft/s
112
If coal having a heat of combustion of 14,000 BTU/lb is used in a heating plant of 50% efficiency, how many pounds of steam of 50%
quality and 212oF temperature can be made per pound of this coal from water whose initial temperature is 70oF?
A. 11.12 lb
B. 12.04 lb
C. 12.76 lb
D. 13.21 lb
A. 11.12 lb
113
It is planned to lift and move logs from almost inaccessible forest areas by means of balloons. Helium at atmospheric (101.325 kPa) and
temperature 21.1oc is to be used in balloons. What minimum balloon diameter (assume spherical shape) will be required for gross lifting force of 20,000 kg? gas constant for air and Helium are 287.08 and 2077.67 J/kg-K, respectively
A. 16.65 m
B. 33.3 m
C. 44.4 m
D. 48.4 m
B. 33.3 m
114
100 lb of saturated liquid water at 50 psia contained in a closed vessel are heated until 80% of water is vaporized. The amount of heat
added to the system is closest to?
A. 90876 Btu
B. 73920 Btu
C. 65200 Btu
D. 48200 Btu
B. 73920 Btu
115
80 kg of water at 95oC is adiabatically mixed with 20 kg of cold water at 40oC. The entropy change for the process is closest to
A. 0.8473 kJ/K
B. 5.0 kJ/K
C. -0.8473 kJ/K
D. -5.0 kJ/K
A. 0.8473 kJ/K
116
At what critical speed which the flow of water in a long cylindrical pipe of diameter 2 cm becomes turbulent considering that the
temperature is 20oC, viscosity is 1E-3 Pa-s, and the critical Reynolds number is 3000.
A. 0.350 m/s
B. 0.250 m/s
C. 0.234 m/s
D. 0.150 m/s
D. 0.150 m/s
116
If the total percentage of particles larger than the screen opening in the fee, oversize, undersize are 36%, 89% and 3%, respectively the effectiveness of the screen if the undersize is the product is
A. 0.98
B. 0.89
C. 0.78
D. 0.65
B. 0.89
117
For question 9-10, refer to the following; 10 kmols of the fuel gas (composition by volume: methane 85%, ethane 10.5%, nitrogen 4,5%) is
burned with 15% excess air. If complete combustion is assumed;
9. Total number of moles after combustion per 10 kmols of gas is
A. 123.64
B. 272
C. 33.9
D. 124
10. If the total pressure is 100.6 kPa, the partial pressure of water vapor (in kPa) is
A. 16.4
B. 2.7
C. 0.16
D. 2.38
A. 123.64, A. 16.4
118
What is the ratio of the average velocity to maximum velocity for water flowing in a 1” schedule 40 pipe?
A. 0.8
B. 0.9
C. 0.6
D. 0.5
D. 0.5
119
Water at 60 deg F flows through a 3-inch inside diameter smooth horizontal pipe. If the Reynold’s number is 353000, calculate the ratio of maximum velocity to average velocity.
A. 1.05
B. 1.22
C. 1.72
D. 1.89
B. 1.22
120
Four kg of water is placed in an enclosed volume of 1 m3. Heat is added until the temperature is 150oC. Find the pressure of the vapor.
A. 465.9 kPa
B. 470.2 kPa
C. 475.8 kPa
D. 477.2 kPa
From the data in problem #13, find the mass of the vapor.
A. 2.542 kg
B. 2.650 kg
C. 2.721 kg
D. 2.782 kg
From the data in problem #13, find the volume of the vapor.
A. 0.8845 m3
B. 0.9240 m3
C. 0.9791 m3
D. 0.9985 m3
C. 475.8 kPa, A. 2.542 kg, D. 0.9985 m3
121
A certain stoichiometric problem was solved on the basis of 100 mole dry flue gas (DFG). The given conditions at the stack ou tlet are as
follows: 780 mmHg, 970 K and the partial pressure of H2O is 24 mmHg. The computed total moles of H2O is
A. 2.340
B. 4.232
C. 3.175
D. 6.225
From data in problem #16, the partial pressure of H2O is equal to ____ in Hg.
A. 0.88
B. 0.80
C. 0.85
D. 0.94
From data in problem #16, the volume of the wet flue gas is
A. 6.098 m3
B. 8.001 m3
C. 8719 L
D. 592 L
From data in problem #16, Pressure of the gas stream in psia is:
A. 16.09
B. 14.7
C. 22.34
D. 21.71
From data in problem #16, Actual volume occupied by the computed moles of H2O is
A. 246.22 L
B. 256.33 L
C. 24.9 L
D. 25.6 L
From data in problem #16, flue gas temperature in oF is
A. 613
B. 1472
C. 323
D. 1287
C. 3.175, D. 0.94, B. 8.001 m3 , A. 16.09 , A. 246.22 L , D. 1287
122
A mill produces wet paper containing 15% water by weight (wet basis). This wet paper is fed in a continuous steady-state operation
through a drier where the water content is reduced to 6% by weight. If the heating cost is 5 centavos for every pound of water removed
from the paper in the drying operation, what is the heating cost per 100 lb of wet paper fed into the dryer?
A. P1.50
B. P0.36
C. P0.48
D. P2.00
C. P0.48
123
Calculate the volume (cubic feet at STP) of air required for the complete combustion of 500 cu ft of coal gas that has the following
composition: 49.0 per cent hydrogen, 34.8 per cent methane, 4.2 percent ethylene (C2H4), 6.0 per cent carbon monoxide, 4.0 per cent
nitrogen, 1 per cent carbon dioxide.
A. 2150
B. 2420
C. 2590
D. 2636
D. 2636
124
A volume of moist air of 1000 cu ft at a total pressure of 740 mmHg and a temperature of 30oC contains water vapor in such proportions
that its partial pressure is 22 mmHg. Without the total condensation. After cooling it is found that the partial pressure of the water vapor is
12.7 mmHg. Calculate the volume of the gas after cooling.
A. 750 ft3
B. 820 ft3
C. 938 ft3
D. 1022 ft3
From data in problem 24, calculate the weight of water removed.
A. 0.563 lb
B. 1.58 lb
C. 2.98 lb
D. 3.75 lb
C. 938 ft3, A. 0.563 lb
124
The gas phase irreversible reaction A + B C is elementary. The entering flow rate of A is 10 mol/min and is equal molar in A and B.
The entering concentration of A is 0.4 mol/L. What CSTR volume [L] is necessary to achieve 90% conversion?
A. 113
B. 227
C. 851
D. 900
C. 851
125
A quantity of ice at 0.0oC was added to 40 g of water at 19oC in an insulated container. All of the ice melted, and the water temperature
decreased to 0.0oC. How many grams of ice were added?
A. 9.52 g
B. 12.4 g
C. 14.1 g
D. 16.8 g
A. 9.52 g
126
A homogenous gas reaction A 3R has a reported rate at 215C -r A=10-2C A0.5, [mole/liter-sec] Find the space time needed for 80% conversion of a 50% A – 50% inert feed a plug flow reactor operating at 215C and 5 atm
(C Ao=0.0625 mol/liter).
A. 33.2 sec
B. 56.6 sec
C. 2.1 min
D. 4.5 min
A. 33.2 sec
127
Steam generated in a power plant at a pressure of 8600 kPa and a temperature of 500oC is fed to a turbine. Exhaust from the turbine enters a condenser at 10 kPa, where it is condensed to a saturated liquid, which is then pump to the boiler. What is the thermal efficiency of a Rankine cycle operating at these conditions?
A. 39.7%
B. 46.2%
C. 50.8%
D. 61.2%
A. 39.7%
128
A steel casting [Cp=0.5 kJ/kg-K] weighing 40 kg and at a temperature of 450oC is quenched in 150 kg of oil [Cp=2.5 kJ/kg-K] at a 25oC. if
there are no heat losses, what is the change in entropy of the oil?
A. 26.13 kJ/K
B. -16.33 kJ/K
C. 9.80 kJ/K
D. 0
From data in problem #30, what is the change in entropy of the oil and casting considered together?
A. 26.13 kJ/K
B. -16.33 kJ/K
C. 9.80 kJ/K
D. 0
A. 26.13 kJ/K, C. 9.80 kJ/K
129
A horizontal piston/cylinder arrangement is placed in a constant-temperature bath. The piston slides in the cylinder with negligible friction, and an external force holds it in place against an initial gas pressure of 14 bar. The initial gas volume is 0.03 m3. The external force on the piston is reduced gradually, and the gas expands isothermally as its volume doubles. If the volume of the gas is related to its pressure so that the product PV is constant, what is the work done by the gas in moving the external force?
A. -29.11 kJ
B. -32.08 kJ
C. -33.25 kJ
D. -34.08 kJ
A. -29.11 kJ
130
A gaseous fuel is composed of 20% methane (CH4), 40% ethane (C2H6) and 40% propane (C3H8), where all percentage are by volume.
The volumetric analysis of the dry products of combustion (ie. Everything except the water) for this fuel gives 10.6 % carbon dioxide
(CO2), 3% oxygen (O2), 1% carbon monoxide (CO) and 85.4% nitrogen (N2). Determine the air fuel ratio on a mass basis for this reaction.
A. 1
B. 18
C. 23
D. 33
B. 18
131
A solid steel sphere of specific gravity of 7.85 and diameter of 0.02 m is falling at its terminal velocity through water. What is its velocity in
ft/s?
A. 1488
B. 4880
C. 6.21
D. 0.42
C. 6.21
132
What is the settling time [sec] for galena particles to settle under free settling conditions through 5 ft of water at 50degF? Galena is
spherical in shape. With specific gravity and 0,01 inch diameter
A. 38.1
B. 18.3
C. 13.8
D. 5
B. 18.3
133
A diesel engine has a compression ratio of 15:1 that is; the air in the cylinder is compressed to 1/15 of its initial volume. Find the final
pressure after compressing an atmospheric air of temperature 27 C.
A. 44 atm
B. 47 atm
C. 40 atm
D. 41 atm
A. 44 atm
134
A mole of steam is compressed at 100oC, and the water is cooled to 0oC and frozen to ice. What is the entropy change of the water in
cal/oK?
A. -36.9
B. -35.1
C. -34.8
D. -34.3
A. -36.9
135
A floating cylinder 8 cm in diameter and weighing 9.32 Newtons is placed in a cylindrical container that is 20 cm in diameter a nd partially full of water. The increase in the depth of water when the float is placed in it is
A. 10 cm
B. 5 cm
C. 3 cm
D. 2 cm
C. 3 cm
136
A fluid at 690 kPa has a specific volume of 0.25 m3/kg and enters an apparatus with a velocity of 15 m/s. Heat radiation losses in the
apparatus are equal to 25 kJ/kg of fluid supplied. The fluid leaves the apparatus at 135 kPa with a specific volume of 0.9 m3
/kg and a velocity of 300 m/s. In the apparatus, the shaft work done by the fluid is equal to 900 kJ/kg. does the internal energy of the fluid increase or decrease, and how much is the change?
A. 858 kJ/kg (increase)
B. 858 kj/kg (decrease)
C. 908 kJ/kg (increase)
D. 908 kJ/kg(decrease)
D. 908 kJ/kg(decrease)
137
Exhaust steam from a turbine exhaust into a surface condenser at a mass flow rate of 4000 kg/hr, 9.59 kPa, and 92 % quality. Cooling
water enters the condenser at 15oC and leaves at the steam inlet temperature. The cooling water mass rate in kg/hr is closest to
A. 157,200
B. 70,200
C. 95,000
D. 88,000
B. 70,200
138
.A solution of Na2SO4 in water is saturated at 50oC. When a saturated solution of Na2SO4 is cooled, crystals of Na2SO4-10H2O separate
from the solution. If 1000 kg of this solution is cooled to 10oC, the percentage yield obtain is nearly
A. 91%
B. 90%
C. 100%
D. 80%
A. 91%
139
A heat engine absorbs 1055 kJ at 427oC and rejects heat at 38oC. the work done in kJ by the engine if its efficiency is 50% of the Carnot
efficiency is close to
A. 496.6
B. 293.3
C. 1265
D. 320
B. 293.3
140
For question 43-44, refer to the following; A liquid phase reaction A R is carried out in a series of three completely mixed stirred tank
reactors of equal size. The reaction rate constant k is 0.066/min. Overall conversion is 90%. The feed rate is 10 liters/min and the feed contains only A in concentration of 1 gmol/L.
43. The over-all space-time in minutes for the three-reactor system is
A. 5.24
B. 524
C. 52.4
D. 17.5
44. The concentration from the second reactor is
A. 0.2148
B. 0.1
C. 0.35
D. 0.5
C. 52.4 , A. 0.2148
141
A tank holds 500 m3 of brine. Brine containing 2 kg/m3 of salt flows into the tank at the rate of 5 m3 /min and the mixture kept uniform,
flows at the rate of 10 m3/min. If the maximum amount of the salt is found in the tank at the end of 20 minutes, what is the initial salt
content of the tank?
A. 375 kg
B. 500 kg
C. 750 kg
D. 600 kg
A. 375 kg
142
A gas whose viscosity of 200 μP flows through a capillary tube 2 mm in diameter and 2 meters long. If 5 liters of gas pass through the
tube every 10 seconds, what must be the pressure head in dynes/cm2
under which the gas is flowing?
A. 5.09E5
B. 7.56E5
C. 8.31E5
D. 9.04E5
A. 5.09E5
143
Air at 1 atm and 68oF is flowing in a long, rectangular duct whose cross section is 1 ft by 0.5 ft, with average velocity of 40 ft/s. the
roughness of the duct is 0.00006 in. What is the pressure drop in Pa per meter length?
A. 2.8
B. 6.8
C. 10.2
D. 14.1
B. 6.8
144
The temperatures of three different liquids are maintained at 15oC, 20oC, and 25oC respectively. When equal masses of the first two liquids are mixed, the final temperature is 18oC, and when equal masses of the last two liquids are mixed, the final temperature is 24oC. What temperature will be achieved by mixing equal masses of the first and the last liquid?
A. 8.65C
B. 10.30C
C. 15.83C
D. 23.57C
D. 23.57C
145
A gaseous reaction A -> 2B + C takes place isothermally in a constant pressure reactor. Starting with a gaseous mixture containing 50% A and the rest inert materials, the ratio of final to initial volume is found to be 1.8. The percent conversion of A is
A. 80%
B. 50%
C. 60%
D. 74%
A. 80%
146
A sample of lignite was found to contain 34.55% moisture, 22.91% FC, 7.2% ash, 1.1%S and 0.57% N with a calorific value of 16.45
MJ/kg. Calculate % C in the coal.
A. 46.15%
B. 49.09%
C. 65.76%
D. 55.40
A. 46.15%
147
The flue gas from the combustion of a hydrocarbon fuel has the following Orsat analysis: 5.68% CO2, 2.43% CO, 6.4% O2 and 85.4 % N2. The percent excess air supplied is
A. 30.0%
B. 34.8%
C. 38.6%
D. 42.5%
A. 30.0%
148
A furnace is fired with coal with a velocity of 20 m/s and enthalpy of 3140 kJ/kg. The coal has a heating of 32,000 kJ/kg and the refuse
was analyzed to contain 4.8% VCM, 12.6% FC and 82.6% ash. The percentage of the carbon lost in the refuse is
A. 2.16%
B. 2.97%
C. 3.02%
D. 2.98%
A. 2.16%
149
A furnace is fired with coal with the following proximate analysis: 5%M, 60%FC, 25%VCM and 10% ash. Its calorific value is 31.33 MJ/kg.
Calculate the % VCM lost in the refuse if the refuse analyzes 25% FC, 4.4 % VCM, 70.6% ash.
A. 5.1
B. 4.59
C. 2.21
D. 3.45
C. 2.21
150
1.8 kg/s of steam enter a turbine with a velocity of 20 m/s and enthalpy of 3140 kJ/kg. The steam enters the condenser after being
expanded to 2500 kJ/kg at 38 m/s . There is a total heat loss from the turbine casing of 53 kJ/s. Potential energy changes are
insignificant. What power is generated at the turbine shaft?
A. 875 kW
B. 1098 kW
C. 1515 kW
D. 1480 kW
B. 1098 kW
151
Water at 20oC is flowing in a pipe of radius 1.0 cm. The viscosity of water at 20oC is 1.005 centipoise. If the flow speed at the center is
0.200 m/s and the flow is laminar, find the pressure drop along a 5 m section pipe.
A. 20.4 Pa
B. 40.2 Pa
C. 13.4 Pa
D. 45.8 Pa
B. 40.2 Pa
152
An oil is in laminar flow in a ½ -in I.D. tube at 6 gal/min. The oil viscosity is 300 centipoises, and its density is 60 lb/ft3. Calculate the
pressure drop per foot pipe length in psia.
A. 0.45
B. 112
C. 42.1
D. 7.84
From the data in problem #56, calculate the velocity at the center of the tube in ft/s.
A. 5.4
B. 12.5
C. 19.6
D. 9.8
From the data in problem #56, calculate the radial position at which the pint velocity is equal to the average velocity in inches.
A. 0.177
B. 0.085
C. 0.244
D. 0.221
D. 7.84, C. 19.6 , A. 0.177
153
The solubility of a substance A at 25C is 25 g/L and at 50C its solubility is 75 g/L. If 500 mL of a saturate solution of A is cooled from
50C to 25C, how many grams of solute A will be crystallized? Assume volume of solute in the solution is negligible.
A. 12.5 g
B. 37.5 g
C. 25 g
D. 32.5 g
C. 25 g
154
Air at 394.3 K flows through a packed bed of cylinders having a diameter of 0.0127 m and a length the same as the diameter. T he bed
void fraction is 0.40 and the length of the packed bed is 3.66 n. The air enters the bed at 2.20 atm abs at the rate of 2.45 kg/m2
-s based on the empty cross section of the bed. Calculate the pressure drop of air in the bed.
A. 12.3 kPa
B. 15.47 kPa
C. 18.20 kPa
D. 20.35 kPa
B. 15.47 kPa
155
Calculate the terminal velocity of a steel bar 2 mm diameter and of density 7870 kg/m3
in an oil of density 900 kg/m3 and viscosity 50mN·s/m2.
A. 0.189 m/s
B. 4.55 m/s
C. 8.12 m/s
D. 14.8 m/s
A. 0.189 m/s
156
What is the mass of a sphere of material of density 7500 kg/m3
whose terminal velocity in a large deep tank of water is 0.6 m/s?
A. 0.029 g
B. 2.9 g
C. 0.00029 g
D. 29.0 g
A. 0.029 g
157
A solution containing 10 per cent of caustic soda is to be concentrated to a 35 per cent solution at a rate of 180000 kg/day during a year of 300 working days. A suitable single-effect evaporator for this purpose, neglecting the condensing plant, costs $1600 and for a multiple effect evaporator the cost may be taken as $1600N, where N is the number of effects. Boiler steam may be purchased at $0.20/1000 kg and the vapour produced may be assumed to be 0.85N kg/kg of boiler steam. Assuming the interest on capital, depreciation, and other fixed charges amount to 45 per cent of the capital involved per annum, and that the cost of labour is constant and independent of the number of effects employed, determine the number of effects which, based on the data given, will give the maximum economy.
A. 1
B. 2
C. 3
D. 4
D. 4
158
A single effect evaporator operates at 13 kN/m2. What will be the heating surface necessary to concentrate 1.25 kg/s of 10 per cent caustic soda to 41 per cent, assuming a value of U of 1.25 kW/m2·K, using steam at 390K? the heating surface is 1.2 m below the liquid level. The boiling-point rise of the solution is 30 deg K, the feed temperature is 291K, the specific heat capacity of the feed is 4.0 kJ/kg·K, the specific heat capacity of the product is 3.26 kJ/kg·K and the density of the boiling liquid is 1390 kg/m3.
A. 45 m2
B. 75 m2
C. 107 m2
D. 142 m2
C. 107 m2
159
A single effect evaporator is used to concentrate 0.075 kg/s of a 10 per cent caustic soda liquor to 30 per cent. The unit employs forced circulation in which the liquor is pumped through the vertical tubes of the calandria which are 32 mm o.d. by 28 mm i.d. and 1.2 m long. Steam is supplied at 394K, dry the saturated, and the boiling point rise of the 30 per cent solution is 15 deg K. if the overall heat transfer coefficient is 1.75 kW/m2·K, how many tubes should be used. The latent heat of vaporization under these conditions is 2270 kJ/kg.
A. 45
B. 68
C. 93
D. 115
C. 93
160
2.5 kg/s of a solution at 288K containing 10 per cent of dissolved solids is fed to a forward-feed double-effect evaporator, operating at 14
kN/m2 in the last effect. If the product is to consist of a liquid containing 50 per cent by mass of dissolved solids and dry saturated steam is fed to the steam coils, what should be the pressure of the steam? The surface in each effect is 50m2 and the coefficient for the heat
transfer in the first and second effects are 2.8 and 1.7 kW/m2·K respectively. It may be assumed that the concentrated solution exhibits a boiling point rise of 5 deg K, and the latent heat has a constant value of 2260 kJ/kg and that the specific heat capacity of the liquid stream is constant at 3.75 kJ/kg·K.
A. 75 kN/m2
B. 98 kN/m2
C. 115 kN/m2
D. 130 kN/m2
C. 115 kN/m2
161
A saturated solution containing 1500 kg of potassium chloride at 360 K is cooled in an open tank to 290K. if the density of the solution is 1200 kg/m3 the solubility of potassium chloride/100 parts of water by mass is 53.55 at 330K and 34.5 at 290K, calculate the capacity (in m3) of the tank required.
A. 1.27 m3
B. 3.58 m3
C. 7.88 m3
D. 12.4 m3
From the data in problem #7, the mass of crystals obtained, neglecting any loss of water by evaporation
A. 375 kg
B. 455 kg
C. 534 kg
D.588 kg
B. 3.58 m3, C. 534 kg
162
The heat required when 1 kmol of MgSO4·7H2O is dissolved isothermally at 291 K in a large mass of water is 13.3 MJ. What is the heat of crystallization per unit mass of the salt?
A. 47.8 kJ/kg
B. 53.9 kJ/kg
C. 62.1 kJ/kg
D. 68.6 kJ/kg
B. 53.9 kJ/kg
163
2000 kg/h of a mixture consisting of 60 wt% benzene and 40 wt% toluene is to be separated in a distillation column. The distillate is to contain 98 wt% benzene and 95% of feed benzene is to be recovered as distillate. What is the flow rate of the distillate?
A. 820 kg/h
B. 980 kg/h
C. 1163 kg/h
D. 1544 kg/h
From the data in problem #10, calculate the flow rate of the bottom product.
A. 745 kg/h
B. 837 kg/h
C. 988 kg/h
D. 1025 kg/h
From the data in problem #10, calculate the percentage of benzene in the bottom product.
A. 7.2%
B. 92.8%
C. 12.5%
D. 87.5%
C. 1163 kg/h, B. 837 kg/h, A. 7.2%
164
100 kg of a mixture of sodium sulfate crystals (Na2SO4·10H2O) and sodium chloride (NaCl) is heated to drive all the water. Final weight of
the dry mixture is 58.075 kg. calculate the mass of sodium sulfate crystal in the original mixture.
A. 75 kg
B. 50 kg
C. 25 kg
D. 10 kg
From the data in problem #13, calculate the mass of sodium chloride in the original mixture.
A. 75 kg
B. 50 kg
C. 25 kg
D. 10 kg
From the data in problem #13, calculate the molar ratio of dry NaSO4 and NaCl in the original mixture.
A. 0.45
B. 0.55
C.0.65
D. 0.75
A. 75 kg , C. 25 kg , B. 0.55
165
Calculate the amount of H2S in cubic meters measured at 49˚C and at a pressure of 0.2 barG, which may be produced from 10 kg of FeS.
A. 2.5 m3
B. 3.0 m3
C. 3.5 m3
D. 4.0 m3
A. 2.5 m3
166
A piston cylinder initially contains 100 gmol of an ideal gas at a pressure of 516.3 kN/m2
A and 10˚C. External pressure is 101.3 kN/m2
.The piston is weighted with 100 kg of weight and held in place with latches. The temperature is kept constant. When latches are released, the piston moves up and comes to rest when the forces are balanced. Calculate the work done during this expansion. Area of cross section of piston is 0.0029 m2.
A. 20 kJ
B. 25 kJ
C. 30 kJ
D. 35 kJ
From the data in problem 17, next the mass is remove and the cylinder is allowed to come to equilibrium against the external pressure.
What is the work done in this step?
A. 216 kJ
B. 178 kJ
C. 157 kJ
D. 125 kJ
From the data in problem #17, what would be the work done if the gas were expanded reversibly against the external pressure?
A. 275 kJ
B. 383 kJ
C. 126.7 kJ
D. 65.4 kJ
D. 35 kJ, A. 216 kJ, B. 383 kJ
167
Two Carnot engines are operating in series. The first one absorbs heat at a temperature of 1111 K and rejects heat to the second engine
at a temperature T. the second engine receives the heat at the intermediate temperature T and rejects it to a reservoir at 300 K. Calculate
T if the efficiencies of the two engines are equal.
A. 498 K
B. 577 K
C. 645 K
D. 722 K
From the data in problem #20, calculate T if the work done by the two engines are equal.
A. 488 K
B. 585 K
C. 705 K
D. 645 K
B. 577 K , C. 705 K
168
Calculate the specific volume (in m3
/kmol) of CH3Cl at 1379 kPa and 205˚C using the Van der Waals equation. Van der Waals constant for CH3Cl are a=757.4 kPa·m6/kmol2
and b=0.034 m3/kmol.
A. 2.76
B. 3.65
C. 4.23
D. 4.99
A. 2.76
169
A Carnot engine operates in a closed system by absorbing heat at 927˚C and rejecting heat at 27˚C and produces 5021 kJ of net work.
Determine the heat input of the engine.
A. 6695 kJ
B. 6422 kJ
C. 5988 kJ
D. 5465 kJ
From the data in problem #23, determine the heat output of the engine.
A. 1422 kJ
B. 1674 kJ
C. 1877 kJ
D. 1988 kJ
A. 6695 kJ, B. 1674 kJ
170
The constant pressure specific heat of acetonitrile vapor at low pressure is given by the equation Cp=21.3 + 11.562E-2T-3.812E-5T2
where T in K and Cp is in kJ/kgmol·K. Estimate specific heat ratio (Cp/Cv) for acetonitrile at 1000 K.
A. 1.09
B. 1.76
C. 2.15
D. 2.67
A. 1.09
171
25 kg of carbon dioxide are to be heated from 300 to 700 K at constant volume. Calculate the number of kJ to be supplied. Specific heat
of carbon dioxide is given by Cp=43.26 + 0.0115T where Cp is in kJ/kmol·K and T is in degrees Kelvin.
A. 7655 kJ
B. 8675 kJ
C. 8822 kJ
D. 9249 kJ
D. 9249 kJ
171
Liquid allyl alcohol has a vapor pressure of 53.32 kPa at 80.2˚C and its normal boiling point is 96.6˚C. calculate the heat of vaporization
over the temperature range of 80.2 to 96.6˚C.
A. 35678 kJ/kmol
B. 42472 kJ/kmol
C. 48855 kJ/kmol
D. 52344 kJ/kmol
B. 42472 kJ/kmol
172
In a refrigeration cycle using HFC-143a, the refrigerant enters the expansion valve as saturated liquid at 10 barA and 40˚C, the
downstream pressure is 1.38 barA. What is the entropy increase (kJ/kg·K) in the expansion?
A. 0.0057
B. 0.035
C. 0.65
D. 2.14
B. 0.035
173
Aa certain reaction has the rate given by –r A=0.01C A2 mol/cm3·min. If the rate is to be expressed in kmol/liter 2h, what is the value of the rate constant?
A. 0.6 L/kmol·h
B. 0.6 L/kmol·min
C. 0.8 L/kmol·h
D. 0.8 L/kmol·min
A. 0.6 L/kmol·h
174
For a gas phase elementary reaction, A → 3R, what is fractional volume change assuming the volume varies linearly between zero and
complete conversion? The reaction mixture initially contains 40% by volume inerts.
A. 0.8
B. 1.0
C. 1.2
D. 1.4
C. 1.2
175
A substance A decomposes by first order kinetics. In a batch reactor, 50% A is converted in 5 min. How much longer would it take to
reach 90% conversion?
A. 12.4 min
B. 16.6 min
C. 18.9 min
D. 21.4 min
B. 16.6 min
176
The reaction CO2 + H2 ↔ CO + H2O is carried out by heating to 1000K and allowing the reaction to come to equilibrium at 50 bar total
pressure. 60% of CO2 is found to be converted. What is the value of the equilibrium constant Kp if the initial mixture consisted of only CO2
and H2 in equimolar proportion? Assume ideal behavior of components.
A. 1.12
B. 2.25
C. 2.88
D. 3.15
From the data in problem #32, what is the partial pressure of CO in the mixture?
A. 8 barA
B. 12 barA
C. 15 barA
D. 18 barA
B. 2.25, C. 15 barA
177
A liquid phase reaction A → R is carried out in a CFSTR. The reaction rate is 1 mol/liter/h. Feed is 5% converted. Find the size of the
reactor needed for 80% conversion of feed is to be processed at a rate of 1200 mol/h.
A. 600 L
B. 800 L
C. 900 L
D. 1000 L
From the data in problem #34, if the feed rate is doubled, what is the size of the reactor needed?
A. 1200 L
B. 1350 L
C. 1500 L
D. 1800 L
C. 900 L, D. 1800 L
178
A homogeneous liquid phase second-order reaction 2A → R is carried out in a plug-flow reactor with 60% conversion. What will be the
new conversion in a plug-flow reactor two times as large if all other variables remain the same, and if the reaction takes place without a
volume change? Feed to the reactor is pure A.
A. 0.75
B. 0.70
C. 0.65
D. 0.60
A. 0.75
179
Production of a chemical plant of a rated manufacturing capacity 100,000 tons of chemical per year involves the following costs:
Plant investments………………...$10,000,000.00
Overhead costs…………………...$1,000,000.00/yr
Manufacturing costs………………$50/ton
Selling price………………………..$100/ton
Assuming depreciation of 10%, calculate the breakeven capacity as a percent of rated capacity of the chemical plant.
A. 30%
B. 40%
C. 50%
D. 60%
B. 40%
180
The inside temperature of a composite wall is maintained at 2000˚F, and the outside ambient air temperature is maintained at 70˚F. The composite wall consists of three layers of materials; their thickness from the hotter to the colder surface is 12, 12 and 10 inches, respectively. The corresponding thermal conductivities are 0.4, 0.2 and 0.1 Btu/hr·ft·˚F, respectively. Assume that thermal conductivities are invariant with temperature and inside heat transfer resistance is negligible. The outside air film heat transfer coefficient is 2 Btu/hr·ft2·˚F. Calculate the heat loss through the composite wall in Btu/hr·ft2.
A. 118
B. 124
C. 132
D. 138
From the data in problem #38, calculate the outside surface temperature.
A. 89˚F
B. 98˚F
C. 112˚F
D. 129˚F
A. 118, D. 129˚F
181
A 2200-kg automobile travelling at 90 kph (25 m/s) hits the rear of s stationary, 1000-kg automobile. After the collision, the large
automobile slows to 50 kph (13.89 m/s) the smaller vehicle has a speed of 88 kph (24.44 m/s). what has been the increase in internal
energy, taking both the vehicles as the system?
A. 120.7 kJ
B. 176.6 kJ
C. 145.2 kJ
D. 15.1 kJ
B. 176.6 kJ
182
Air at 1 bar and 25˚C enters a compressor at low velocity, discharges at 3 bar and enters a nozzle in which it expands to a final velocity of
600 m/s at the initial conditions of pressure and temperature. If the work of compression is 240 kJ/kilogram of air, how much heat must be
removed during compression in kJ/kg?
A. 60
B. 180
C. 240
D. 300
A. 60
183
Assume that spheres having diameters of 0.005 cm and a density of 1.2 g/cm3 are settling in water (0.01 poises) under free settling conditions where the particles do not interfere with each other. What would be the free settling velocity in cm per seconds?
A. 2.05
B. 1.08
C. 0.57
D. 0.027
D. 0.027
