95-102 Flashcards
(158 cards)
1
Q
Sulfuric acid is pumped at 3 kg/s through a 60-m length of smooth 25 mm pipe. If the pressure drop falls by one-half, what will be the new
flow rate (kg/s)? Assume the following properties of sulfuric acid: SG=1.84, viscosity=25 cP.
A. 3 B. 2 C. 0.2 D. 0.124
A
B. 2
2
Q
Property of fluid that converts kinetic energy to heat energy.
A. viscosity B. fluidity C. shear D. resistance
A
B. fluidity
3
Q
Which of the following is an extensive property?
A. temperature B. velocity C. pressure D. mass
A
D. mass
4
Q
If the temperature of a confined gas is constant, the pressure is inversely proportional to the volume. This is known as:
A. Charles law B. Archimedes principle
C. Boyle’s law D. Dalton’s law
A
C. Boyle’s law
5
Q
Which of the following is the most efficient?
A. Carnot B. Brayton C. Otto D. Diesel
A
A. Carnot
6
Q
The achievement of a temperature below that of the immediate surroundings is
A. air conditioning B. drying
C. refrigeration D. evaporation
A
C. refrigeration
7
Q
Work is a
A. property of the system
B. state function
C. path function
D. state description of a system
A
C. path function
8
Q
Throttling process is
A. a reversible and isothermal process
B. a reversible and constant entropy process
C. an irreversible and constant entropy
D. constant enthalpy
A
D. constant enthalpy
9
Q
In the reversible isothermal expansion of an ideal gas at 300 K from 1 to 10 liters, where the gas has an initial pressure of 20 atm, calculate the change in entropy of the gas in cal/°K.
A. 3.20 B.3.46 C. 3.72 D. 3.86
A
C. 3.72
10
Q
To have an efficiency of 40 percent, a heat engine that exhausts heat at 350°K must absorb heat at no less than
A. 210 K B. 875 K
C. 583 K D. 1038 K
A
B. 875 K
11
Q
If a Carnot engine absorbs 10kJ of heat per cycle when it operates between 500 and 400 K, the work it does per cycle is
A. 2 kJ B. 8 kJ C. 2.5 kJ D. 10kJ
A
A. 2 kJ
12
Q
Calculate the entropy change in cal/°K if 350 grams of water at 5°C is mixed with 500 grams of water at 70°C.
A. 4.485 B. 4.580
C. 4.652 D. 4.789
A
A. 4.485
13
Q
A rigid tank contains hot fluid that is cooled while being stirred by a paddle wheel. The internal energy of fluid is 800 kJ and loses 500 kJ ofnheat during cooling process with the paddle work of 100 kJ applied on the fluid. Neglecting the energy stored in the paddle wheel, determine the final internal energy of the fluid.
A. 430 kJ B. 340 kJ
C. 400 kJ D. 500 kJ
A
C. 400 kJ
14
Q
How many cubic feet per minute of entering air is needed to evaporate 10 lb of water per hour from a rayon, if the air enters at 80°F and 25% humidity and leaves at 170°F and 55% relative humidity. The operating pressure is 14.3 psia.
A. 12.7 cfm B. 145.8 cfm
C. 255.1 cfm D. 322.5 cfm
A
A. 12.7 cfm
15
Q
A nitrogen-hydrogen chloride mixture (10 vol% hydrogen chloride) is to be scrubbed with water to remove the hydrogen chloride. To satisfy
environmental concerns, 99% of the inlet HCl must be removed. Assuming that the gas leaving the scrubber will be at 125°F and 1 atm saturated with water, what will be the volume of the gas leaving if we must process 200 lbmol/hr of dry entering gas.
A. 88630 ft3/hr B. 71000 ft3/hr
C. 61210 ft3/hr D. 57441 ft3/hr
A
A. 88630 ft3/hr
16
Q
From the data in problem #2, calculate the percentage hydrogen chloride of the gas leaving.
A. 2% B. 0.1%
C. 0.0001% D. 0.02%
A
B. 0.1%
17
Q
0.6 m3/s (measured at STP) of gas is to be dried from a dew point of 294 K to a dew point of 277.5 K. how much water must be removed?
Vapour pressure of water at 294 K is 2.5 kN/m2. Vapour pressure of water at 277.5 K is 0.85 kN/m2
A. 2.1 kg/s B. 0.75 kg/s
C. 0.0071 kg/s D. 0.00009 kg/s
A
C. 0.0071 kg/s
18
Q
From the data in problem #4, what will be the volume of the gas after drying measured at STP?
A. 0.59 m3/s B. 2.18 m3/s
C. 4.52 m3/s D. 6.78 m3/s
A
A. 0.59 m3/s
19
Q
Wet material, containing 70% moisture on a wet basis, is to be dried at a rate of 0.15 kg/s in a counter-current dryer to give a product containing 5% moisture (both on a wet basis). The drying medium consists of air heated to 373 K and containing water vapour with a partial pressure of 1.0 kN/m2. The air leaves the dryer at 313 K and 70% saturated. Calculate how much air will be required to remove the moisture. The vapour pressure of water at 313 K may be taken as 7.4 kN/m2.
A. 0.54 kg/s B. 3.78 kg/s
C. 12.1 kg/s D. 45.1 kg/s
A
B. 3.78 kg/s
20
Q
30,000 m3 of cool gas (measured at 289 K and 101.3kN/m2
saturated with water vapour) is compressed to 340 kN/m2
pressure, cooled to
289 K and the condensed water is drained off. Subsequently the pressure is reduced to 170 kN/m3 and the gas is distributed at this pressure and 289 K. What is the percentage absolute humidity after this treatment? The vapour pressure of water at 289 K is 1.8 kN/m2.
A. 30% B. 40% C. 50% D. 60%
A
C. 50%
21
Q
When a porous solid was dried under constant-drying conditions, 5 hours were required to reduce the moisture from 30 to 12 lb H2O/lb dry
solid. Critical moisture content is 18 lb H2O/lb dry solid and the equilibrium moisture is 5 lb H2O/lb dry solid. If the drying rate during the falling-rate period is a straight line through the origin, determine the time needed to dry the solid from 30 to 8 lb H2O/lb dry solid.
A. 3.44 hr B. 7.74 hr
C. 1.25 hr D. 2.88 hr
A
B. 7.74 hr
22
Q
For acetone at 20°C and 1 bar, volume expansivity (β) =1.478 E-3/°C, isothermal compressibility (κ) =62 E-6/bar and specific volume (V) =1.287 cm3/g. The value of (∂P/∂T)V is
A. 24 bar/°C B. 42 bar/°C
C. 10 bar/°C D. 33 bar/°C
A
A. 24 bar/°C
23
Q
For acetone at 20°C and 1 bar, volume expansivity (β) =1.478 E-3/°C, isothermal compressibility (κ) =62 E-6/bar and specific volume (V)=1.287 cm3
/g. The pressure generated when acetone is heated at constant volume from 20°C and 1 bar to 30°C is
A. 241 bar B. 110 bar
C. 177 bar D. 220 bar
A
A. 241 bar
24
Q
For acetone at 20°C and 1 bar, volume expansivity (β) =1.478 E-3/°C, isothermal compressibility (κ) =62 E-6/bar and specific volume (V)=1.287 cm3/g. The volume change in (cm3/g) when acetone is changed from 20°C and 1 bar to 0°C and 10 bar.
A. 0.038 B. -0.038
C. 0.144 D. -0.144
A
B. -0.038
25
A boiler plant raises 5.2 kg/s of steam at 1825 kN/m2 pressure, using coal of calorific value of 27.2 MJ/kg. If the boiler efficiency is 75%, how much coal is consumed per day?
A. 0.12 kg/s B. 0.71 kg/s
C. 4.22 kg/s D. 10.12 kg/s
B. 0.71 kg/s
26
From the data in problem #12, if the steam is used to generate electricity, what is the power generation in kilowatts assuming a 20% conversion efficiency of the turbines and generators?
A. 1 MW B. 3 MW
C. 5 MW D. 7 MW
B. 3 MW
27
Compare the costs of electricity at P1.00 per kWh and gas at P15.00 per therm.
A. Cost of electricity is P0.14 per MJ
B. Cost of gas is P0.28 per MJ
C. Cost of electricity is P0.14 per MJ less than cost of gas
D. Cost of electricity is P0.14 per MJ more than cost of gas
D. Cost of electricity is P0.14 per MJ more than cost of gas
28
A refrigerator is proposed that will require 10 hp to extract 3 MJ of energy each minute from a space which is maintained at -18°C. The outside air is at 20°C. Is this possible?
A. maybe B. no
C. cannot be determined D. yes
B. no
29
Stalagmometer is used for the measurement of
A. kinematic viscosity
B. surface tension
C. refractive index
D. optical activity
B. surface tension
30
An instrument for the detection of high energy decay products of radioactive nuclei, which is based on the counting of light pulses
produced by radiation when it enters a crystal.
A. scintillation counter
B. voltmeter
C. radiograph
D. spectrometer
A. scintillation counter
31
A tube containing a salt solution that is used to connect two-half cells in an electrochemical cell. It allows passage of ions, but prevents mixing of the half-cell electrolytes.
A. salt bridge B. membrane
C. capillary tube D. brine
A. salt bridge
32
The Brinell number of a material is a measure of
A. specific gravity B. density
C. specific heat D. hardness
D. hardness
33
A gas turbine cycle consisting of two adiabatic steps and two isobaric steps.
A. Brayton cycle B. Sterling cycle C. Rankine cycle D. Otto cycle
A. Brayton cycle
34
At low Reynold's number
A. viscous forces are unimportant
B. viscous forces control
C. viscous forces control and inertial forces are unimportant
D. gravity forces control
C. viscous forces control and inertial forces are unimportant
35
At high Reynold's number
A. inertial forces control and viscous forces are unimportant
Page 1 of 5
B. viscous forces predominates
C. inertial forces are unimportant and viscous forces control
D. none of these
A. inertial forces control and viscous forces are unimportant
Page 1 of 5
36
Channeling is most severe
A. in towers packed with stacked packing
B. in towers packed randomly with crushed solids
C. in dumped packing of regular units
D. at very high liquid flow rate
A. in towers packed with stacked packing
37
The most common filter aid is
A. diatomaceous earth
B. calcium silicate
C. sodium carbonate
D. sphalerite
A. diatomaceous earth
38
An example of a collector for flotation of metallic sulfides and native metals is
A. xanthates B. sodium silicate
C. sodium sulfide D. sphalerite
A. xanthates
39
The operating speed of a ball mill should be
A. less than the critical speed
B. much more than the critical speed
C. at least equal to the critical speed
D. none of these
A. less than the critical speed
40
Boiler feed pump is usually a
A. reciprocating pump
B. gear pump
C. multistage centrifugal pump
D. diaphragm pump
B. gear pump
41
Plunger pumps are used for
A. higher pressure B. Slurries
C. Viscous mass D. none of these
A. higher pressure
42
For pipes that must be broken at intervals for maintenance the connector used should be a
A. union B. tee
C. reducer D. elbow
A. union
43
Tea percolation employs
A. a liquid-liquid extraction
B. absorption
C. leaching
D. adsorption
C. leaching
44
A 5 dm3 flask containing N2 at 5.0 bar was connected to a 4.0 dm3 flask containing He at 4.0 bar, and the gases were allowed to mix isothermally. Calculate the total pressure of the resulting mixture.
A. 4.6 bar B. 1.8 bar
C. 2.8 bar D. 1.2 bar
A. 4.6 bar
45
Assume that an atom of neon is 0.065 nm in radius and that 1 mol of the gas occupies 22.4 dm3 . What fraction of the volume is occupied by the atoms?
A. 0.031 B. 0.0031
C. 0.00031 D. 0.000031
D. 0.000031
46
What is the difference in the density of dry air at 1 atm and 25°C and moist air with 50% relative humidity under the same conditions?
A. 1.185 kg/m3 B. 1.178 kg/m3
C. 1.987 kg/m3 D. 0.007 kg/m3
D. 0.007 kg/m3
47
The coefficient of viscosity for water vapor at 150°C and 1.01 bar is 1.445E-5 Pas. calculate the molecular diameter for a water molecule
under these conditions.
A. 0.402 nm B. 5.644 nm
C. 0.0056 nm D. 75.65 nm
A. 0.402 nm
48
A light machinery oil has viscosity of 5E-2 Pas and density of 970 kg/m3 at 25°C, how long will it take for a sample to pass through a viscometer of water under the same conditions takes 1 minute?
A. 57.9 min B. 45.8 min
C. 38.8 min D. 27.9 min
A. 57.9 min
49
Assuming the cubic expansion coefficient (α) is 2.21E-5 K-1, and the isothermal compressibility (κ) is 1.32E-6 bar-1, and density of 2.702E3 kg/m3, find the difference between Cp and Cv for Al at 25°C.
A. 0.078 J/molK B. 0.11 J/molK C. 0.87 J/molK D. 1.25 J/molK
B. 0.11 J/molK
50
The heat of combustion of H2(g) to form H2O(l) under constant-pressure conditions is -285.83 kJ/mol at 25°C. If the water if formed at 1 bar and has a density of 1000 kg/m3, calculate the change in internal energy for this reaction.
A. -187 kJ/mol B. -210 kJ/mol
C. -282 kJ/mol D. -310 kJ/mo
C. -282 kJ/mol
51
What would be the final volume occupied by 1.00 mol of an ideal gas initially at 0°C and 1.0 bar if q=1000 J during a reversible isothermal expansion?
A. 27.8 dm3 B. 31.2 dm3
C. 35.3 dm3 D. 38.9 dm3
C. 35.3 dm3
52
Five moles of a diatomic gas is allowed to expand isothermally at 25°C from 0.02 to 0.10 m3
. Calculate the work if the expansion is performed reversibly.
A. -19.94 kJ B. -25.44 kJ
C. -32.18 kJ D. -35.77 kJ
A. -19.94 kJ
53
Consider an adiabatic calorimeter in which 1kg of water at 98.3°C is mixed with 0.10 kg of water at 0°C. What is the final temperature of the 1.1 kg of water?
A. 89.4°C B. 82.1°C
C. 78.4°C D. 74.3°C
A. 89.4°C
54
From the data in problem #10, if the 0.10 kg of water were originally ice at 0°C, what would be the final temperature of the mixture?
A. 89.4°C B. 82.1°C
C. 78.4°C D. 74.3°C
B. 82.1°C
55
An oxygen bomb calorimeter was calibrated using a 0.325-g sample of benzoic acid (U=6316 cal/g), which gave a change in
temperature of 1.48°C. What is the calorimeter constant in J/K?
A. 4245 B. 5120 C. 5803 D. 6221
C. 5803
56
From the data in problem #12, a 0.69-g sample of gasoline was oxidized in the calorimeter, resulting in a temperature change of 4.89°C. What is the U for 1 g of gasoline?
A. -34.5 kJ B. -41.1 kJ
C. -49.8 kJ D. 53.2 kJ
B. -41.1 kJ
57
A system absorbs 1.5 kJ at 25°C from its surroundings and later releases 1.5 kJ to its surrounding at 75°C. Calculate the overall entropy change for the system assuming both processes are reversible.
A. 0.1 J/K B. 0.7 J/K
C. 1.5 J/K D. 2.2 J/K
B. 0.7 J/K
58
Calculate the percent conversion to PCl5 at 1.00 bar total pressure and 400 K for the reaction PCl(g) + Cl2(g) ↔ PCl5(g) if the original
reaction mixture contained 1.0 mol PCl3 and 2.0 mol Cl2. For this reaction G at 400°K is 3533J.
A. 45.3% B. 52.1%
C. 57.8% D. 62.6%
D. 62.6%
59
From the data in problem #15, calculate the partial pressure of PCl5 at equilibrium.
A. 0.09 bar B. 0.26 bar
C. 4.22 bar D. 8.77 bar
B. 0.26 bar
60
It is the transfer of heat from one body to another body, not in contact with it, by means of wave motion through space.
A. conduction B. convection
C. radiation D. evaporation
C. radiation
61
It refers to any layer or deposit of extraneous material on a heat-transfer surface.
A. scaling B. salting
C. fouling D. boiling
C. fouling
62
It occurs when the fluid flow rate is great enough so that the pressure drop across the bed equals the weight of the bed.
A. fluidization B. cavitation
C. channeling D. pressure drop
A. fluidization
63
The resistance of a layer of fluid to flow over the next layer is measured by
A. viscosity B. friction factor
C. surface tension D. density
A. viscosity
64
A method of enzyme immobilization where its means of capture is by coating a liquid droplet containing enzymes with some semipermeable materials formed in situ.
A. adsorption
B. covalent bonding
C. entrapment
D. ericapsulation
D. ericapsulation
65
Lower BWG means
A. lower thickness tube
B. outer diameter of tube
C. lower cross-section of tube
D. inner diameter of tube
C. lower cross-section of tube
66
What device is used to protect the pipe line from bursting due to pressure rise when the water in the pipe line is brought to rest?
A. surge tank B. check valve
C. sluice gate D. float
A. surge tank
67
Ratio of viscosity to density.
A. absolute viscosity
B. kinematic viscosity
C. relative viscosity
D. threshold viscosity
B. kinematic viscosity
68
Which of the following heat exchangers where fluid flow in the same direction and both are of changing temperatures?
A. parallel flow B. cross flow
C. counter flow D. mixed flow
A. parallel flow
69
Which of the following is not a heat exchanger?
A. condenser B. boilers
C. evaporators D. water hammer
D. water hammer
70
The thermal conductivity does not depend on which of the following?
A. chemical composition
B. physical state or texture
C. temperature and pressure
D. gravitational pull
D. gravitational pull
71
Which of the following is not a unit of the rate of heat transfer?
A. Watt B. BTU/hr
C. cal/s D. BTU/hphr
D. BTU/hphr
72
The half-life of a material undergoing second order decay is
A. proportional to the square of initial concentration
B. inversely proportional to the initial concentration
C. independent of initial concentration
D. proportional to initial concentration
B. inversely proportional to the initial concentration
73
A dimensionless number which is the ratio of the characteristic relaxation time of the fluid and the characteristic time scale of flow.
A. Deborah number
B. Grashof number
C. Poclet number
D. Froude number
A. Deborah number
74
It measure the tendency of the coal to swell when burned or gasified in fixed or fluidized bed.
A. Fisher assay
B. Hardgrove index
C. free-swelling index
D. friability
C. free-swelling index
75
It is the residue for the destructive distillation of wood.
A. shale oil B. charcoal
C. bagasse D. char
B. charcoal
76
Let c be the concentration of a reagent. For a first order reaction, what would be a plot in ln c versus t yield?
A. a straight line whose slope is k.
B. a straight line whose slope is -k.
C. a horizontal line with an intercept of the ln c axis at ln c=k.
D. a logarithmic curve approaching a value of k.
A. a straight line whose slope is k.
77
Which of the following statements is false?
A. When temperature is raised, the rate of any reaction is always increased.
B. In general, when any two compounds are unmixed, a large number of reactions may be possible, but those
which proceed the fastest are the ones observed.
C. It is possible to influence the products of a chemical change by controlling the factors which affect reaction
rates.
D. Heterogeneous reactions are the reactions that takes place at the boundary surface between two faces.
A. When temperature is raised, the rate of any reaction is always increased.
78
Which of the following statements is false?
A. In general, as reaction products are formed, they react with each other and reform reactants.
B. The net rate at which reaction proceeds from left to right is equal to the forward rate minus the reverse rate.
C. At equilibrium, the net reaction rate is zero.
D. The differential rate law is a mathematical expression that shows how the rate of reaction depends on volume
D. The differential rate law is a mathematical expression that shows how the rate of reaction depends on volume
79
Silicone rubbers are
A. polysiloxanes B. polyethylene C. polypropylene D. elastomer
A. polysiloxanes
80
It is defined as the average distance a molecule traverses before colliding with other molecules.
A. mean free path
B. collision distance
C. collision length
D. translation
A. mean free path
81
What fraction of crude petroleum has 20 or more carbon atoms in a molecule?
A. kerosene B. gas-oil
C. wax D. residue
C. wax
82
An acid found in vinegar.
A. citric acid B. formic acid
C. stearic acid D. acetic acid
D. acetic acid
83
Who determined that energy is radiated only when an electron falls from a higher energy level to a lower energy level?
A. Einstein B. Rutherford
C. Heisenberg D. Bohr
D. Bohr
84
Who determined the charge of an electron by means of oil droplet experiment?
A. Rutherford B. Heisenberg
C. Millikan D. de Broglie
C. Millikan
85
What alloying element is added in stainless steel to impart corrosion resistance?
A. chromium B. vanadium
C. titanium D. copper
A. chromium
86
Which of the following metals reacts violently with water?
A. sodium B. calcium
C. diamond D. aluminum
A. sodium
87
A freezer is to be maintained at a temperature of -40°F on a summer day when the ambient temperature is 80°F. In order to maintain the freezer box at -40°F it is necessary to remove heat from it at the rate of 70 BTU/min. what is the minimum power that must be supplied to
the freezer?
A. 2.5 hp B. 5 hp
C. 1.2 hp D. 0.47 hp
D. 0.47 hp
88
A cylinder of cork is floating upright in a container partially filled with water. A vacuum is applied to the container that partially removes the
air within the vessel. The cork will
A. rise somewhat in the water
B. sink somewhat in the water
C. remain stationary
D. turn over on its side
B. sink somewhat in the water
89
It is equal to the gross annual sales divided by the fixed capital investments.
A. turnover ratio B. capital ratio C. investment ratio D. acid ratio
A. turnover ratio
90
The cost of a glass lined receiver with a nominal capacity of 1000 gallons is P22,000. Find the estimated cost of a similar receiver but with
a nominal capacity of 2000 gallons.
A. P44,000 B. P33,000
C. P50,000 D. P25,000
B. P33,000
91
Which of the following is an ore of mercury?
A. bauxite B. galena
C. sphalerite D. cinnabar
D. cinnabar
92
Which of the following is the present process for the manufacture of soda ash (Na2CO3)?
A. LeBlanc process
B. Deacon process
C. Solvay process
D. Weldon process
C. Solvay process
93
A device in which the kinetic energy of one fluid (primary fluid) is used to pump another fluid (secondary fluid).
A. pumps B. compressors
C. ejectors D. nozzle
C. ejectors
94
Fluid the amount of steam at 212°C which must be blown into 400 lb of water originally at 70°F in order to make the final temperature 212°F. Heat loses amount to 2000 Btu. The latent heat at 212°F is 970.3 Btu/lb.
A. 42.1 lbs B. 48.0 lbs
C. 50.9 lbs D. 60.6 lbs
D. 60.6 lbs
95
A steam turbine is operating in the following conditions: steam to turbine at 900°F and 120 psia, velocity=250 ft/s; steam existing turbine at 700°F and 1 atm, velocity=100 ft/s. calculate the rate at which work can be obtained from this turbine if the steam flow is 25000lb/h and
the turbine operation is steady state adiabatic.
A. 875.2 Hp B. 949.4 Hp
C. 1020.3 Hp D. 1120.5 Hp
B. 949.4 Hp
96
Which of the following adsorbent is used to decolorize yellow glycerine?
A. silica gel B. Fuller's earth
C. activated carbon D. alumina
C. activated carbon
97
Air enters a drier at a temperature of 240°F with a dew point of 55°F. The drier may be assumed to approach adiabatic vaporization in its operation, all the heat being supplied by the air. If the air leaves the drier saturated with water vapor, how much water per 1000 cu ft of entering wet air?
A. 21.05 lb B. 15.22 lb
C. 8.754 lb D. 1.912 lb
D. 1.912 lb
98
A 190-cm3 sample of argon gas at 25°C required 8.5 seconds to flow through a 1.00 m tube of 1.0 mm radius. The inlet pressure for the gas was 1.02bar, the outlet pressure was 1.007 bar. The volume of the gas was measured at 1.007 bar. What is the viscosity of the gas in
Pas?
A. 4.6 E-6 B. 2.3 E-5
C. 8.9 E-4 D. 5.1 E-3
B. 2.3 E-5
99
Solid lithium hydroxide is used in space vehicle to remove exhaled carbon dioxide. The lithium hydroxide reacts with gaseous carbon dioxide to form solid lithium carbonate and liquid water. How many grams of carbon dioxide can be absorbed by each 1 g of lithium
hydroxide?
A. 0.875 B. 0.919
C. 1.055 D. 1.120
B. 0.919
100
In roll crushers, it is the angle formed by the tangents to the roll faces at the point of contact with the particle to be crushed.
A. angle of repose
B. angle of nip
C. angle of sliding
D. contact angle
B. angle of nip
101
It is a measure of the rate of grinding of materials in a particular mill.
A. reducibility B. malleability
C. grindability D. ductility
C. grindability
102
The hardness of a mineral is a criterion of its resistance to crushing. Which of the following is an example of a hard material?
A. talc B. calcite
C. sapphire D. feldspar
C. sapphire
103
It is the tendency of a material to break into smaller sizes in the course of handling.
A. brittleness B. hardness
C. friability D. toughness
C. friability
104
It is defined as the total surface of a unit weight or volume of a solid.
A. surface area B. specific surface C. specific volume D. particle size
B. specific surface
105
Natural convection is characterized by
A. Reynold's number
B. Peclet number
C. Grashof number
D. Prandtl number
C. Grashof number
106
The Graetz number is concerned with
A. mass transfer between a gas and a liquid
B. heat transfer in turbulent flow
C. absorption with chemical reaction
D. heat transfer in laminar flow
D. heat transfer in laminar flow
107
Plaster of Paris is obtained by calcining
A. bauxite B. gypsum
C. kankar D. limestone
B. gypsum
108
When ice cubes melts in a glass of water, the temperature of the resulting mixture of water and ice
A. increases
B. decreases
C. stays constant
C. stays constant
109
In all natural occurring processes, the entropy of the universe
A. increases
B. stays the same
C. decreases
D. may increase or decrease
A. increases
110
An inventor seeking a patent claims that the building may be comfortably heated in winter by a device that draws heat into the building from the earth, even though the temperature of the earth is lower than the desired temperature inside the building. He further claims that the quantity of heat supplied in the building in a given time period can significantly exceed the work done by the device during the same period. If you were a patent clerk (like the young Albert Einstein), what should be your recommendation about the application?
A. the application should be rejected because it violates the first law of Thermodynamics.
B. the application should be rejected because it violates the second law of Thermodynamics.
C. the application should be rejected because it violates the 1st and 2nd law of Thermodynamics.
D. the application should be given full consideration because it does not violate any laws of thermodynamics
D. the application should be given full consideration because it does not violate any laws of thermodynamics
111
Where the difference in density of the two liquid phases to be separated is very small (as in milk cream separator), the most suitable separator is
A. disc bond centrifuge
B. sharpless supercentrifuge
C. batch basket centrifuge
D. sparkler filter
A. disc bond centrifuge
112
A substance that appears in but one incoming stream and one outgoing stream.
A. tie substance
B. dry component
C. solute
D. solvent
A. tie substance
113
The ratio of the total quantity of the reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the operation as fresh feed is the
A. recycle ratio
B. reactant ratio
C. combined feed ratio
D. fresh-feed conversion
C. combined feed ratio
114
It is known as the blood sugar.
A. glucose B. sucrose
C. fructose D. galactose
A. glucose
115
The ____ was responsible for an epidemic of an incurable hemorrhagic fever in Zaire, Africa in1995.
A. AIDS B. bird flu virus
C. Anthrax virus D. Ebola virus
D. Ebola virus
116
A debutanizer is a
A. heat transfer equipment
B. mass transfer equipment
C. fluid transfer equipment
D. size reduction equipment
B. mass transfer equipment
117
The continuity equation of fluid flow is applicable to which if the following conditions?
I. The flow of fluid is one dimensional
II. The flow of fluid is steady
III. The velocity of flow is uniform over the cross section
A. I only B. I and II only
C. II and III only D. I, II and III
D. I, II and III
118
Hydrometer is used to find out
A. specific gravity of liquids
B. specific gravity of gases
C. specific gravity of solids
D. relative humidity
A. specific gravity of liquids
119
It refers to the type of boiling experienced when the heating surface is surrounded by a relatively large body of fluid which is not flowing at
any appreciable velocity and is agitated only by the motion of the bubbles and by natural-convection currents.
A. film boiling
B. nucleate boiling
C. pool boiling
D. dropwise boiling
C. pool boiling
120
It refers to any layer or deposit of extraneous material on a heat-transfer surface.
A. scaling B. salting
C. fouling D. boiling
C. fouling
121
77. The overall heat transfer coefficient of a jacketed vessel in which steam is the jacket fluid and water is the vessel fluid with stainless steel as the wall material is _____ W/m2
K.
A. 150-300 B. 400-800
C. 850-1700 D. 5000-10000
C. 850-1700
122
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
123
Which of the following statements characterized the laminar flow?
I. The velocity is zero at the pipe wall
II. The velocity is minimum at the center
III. The velocity distribution is circular
A. I only B. II only
C. I and II only D. I, II and II
A. I only
123
In tubes having small diameters, liquids are observed to rise or fall relative to the level of the surrounding liquid. What do you call this phenomenon?
A. fluidity B. capillarity
C. surface tension D. viscosity
C. surface tension
124
It consist of inherent moisture and bed moisture in coal.
A. combined water
B. total moisture
C. equilibrium moisture
D. moisture
B. total moisture
125
The terms "sweet" and "sour" in natural gas terminology, are used to denote the absence or presence of ____.
A. CO B. methane
C. H2S D. glucose
C. H2S
126
It is the solid, cellular, infusible material remaining after the carbonization of coal, pitch, petroleum residue and certain other carbonaceous materials.
A. coke B. char C. wood D. peat
A. coke
127
Which of the following is a hard material?
A. gypsum B. fluorite
C. apatite D. corundum
D. corundum
128
It states that the energy needed during size reduction is proportional to the new surface produced.
A. Bond law
B. Rittinger's law
C. Kirchoff's law
D. Boltzmann Law
B. Rittinger's law
129
A process in which fuel is mixed with the ore and burned on the grate.
A. sintering B. annealing
C. cold working D. heat hardening
A. sintering
130
The parameter which completely describes the behavior of the response to a disturbance of a second order system is the
A. time constant
B. damping coefficient
C. rise time
D. overshoot
B. damping coefficient
131
Which of the following can be adjusted by human operator in a closed feedback control loop?
A. set point
B. controller output
C. process variable
D. load variable
A. set point
132
Deadtime is a function of distance and
A. momentum B. acceleration
C. time D. velocity
D. velocity
133
Neoprene is a
A. monomer B. synthetic rubber C. polyester D. pigment
B. synthetic rubber
133
The process involved in converting rubber into a thin sheet or coating it on fabric is called
A. extrusion B. mastication
C. vulcanization D. calendaring
D. calendaring
134
Silicone is
A. thermoplastic
B. an inorganic polymer
C. thermoseeting plastic
D. a monomer
B. an inorganic polymer
135
Plasticizers are added to paint to
A. make it corrosion resistance
B. give elasticity and prevent cracking of the film
C. make glossy surface
D. increase atmospheric oxidation
A. make it corrosion resistance
136
Alkyl benzene sulfonate (ABS) is a
A. detergent B. rubber
C. pesticide D. polyester
A. detergent
137
Varnish does not contain
A. pigment
B. dryer
C. anti-skinning agent
D. thinner
A. pigment
138
Rancidity of oil can be reduced by
A. decoloration B. hydrogenation C. oxidation D. purification
B. hydrogenation
139
Water insoluble cell binders of wood
A. pulp B. cellulose
C. xylem D. lignin
D. lignin
140
Molasses is a by product of raw sugar from the _____ process.
A. milling B. extraction
C. evaporation D. crystalization
D. crystalization
141
Kraft process is a common name for
A. sulfate pulping
B. sulfite pulping
C. bleaching
D. calendering
B. sulfite pulping
142
DDT means
A.diphenyldichlorotriphenylethane
B.dichlorodiphenyltrichlorobutane
C.dichlorodiphenyldichloroethane
D.diphenyldichlorotriphenylbutane
B.dichlorodiphenyltrichlorobutane
142
A fluid is flowing on the surface, which contains a component that leaches out to the fluid. Assuming that all the 3 regions of mass transfer are present, in which of these regions is diffusion controlling?
A. Knudsen region
B. buffer region
C. turbulent region
D. viscous sublayer
D. viscous sublayer
143
In unsteady state mass transfer, the quantity DAB
t/rm2 is referred to as
A. unaccomplished change
B. relative resistance
C. relative time
D. relative position
C. relative time
144
f Kx > Ky, then the controlling phase is
A. the liquid phase
B. the gas phase
C. the interface
D. either of the bulk phases
B. the gas phase
145
In two phase-mass transfer, equilibrium may exist
A. the interface
B. the gas phase
C. in the liquid phase
D. in either film
A. the interface
146
A fibrous material left after cane sugar has been milled is commonly called as
A. bagasse B. pulp
C. cellulose D. waste
A. bagasse
147
The binder for all the powder materials of paint
A. pigment B. vehicle
C. opacifier D. filler
A. pigment
148
Carbon black is added to rubber compounding as
A. activator B. curing agent
C. retarders D. fillers
A. activator
149
Principal chemical conversion in the production of resin from monomer
A. condensation B. hydration
C. polymerization D. alkylation
B. hydration
150
Polyethylne is an example of ____ polymerization.
A. condensation B. addition
C. copolymerization D. alkylation
A. condensation
151
Which is not true at the interphase of a gas scrubbing operation?
A. the solute concentration of the gas is less than that of the bulk
B. the solute concentration of the liquid is less than that of the bulk
C. the solute concentration of the liquid and gas phase are equal
D. the solute concentration of the gas is greater than the liquid
C. the solute concentration of the liquid and gas phase are equal
152
The unit of volumetric diffusivity is
A. cm2/s B. cm/s
C. cm3/s D. cm2/s2
A. cm2/s
153
In extraction, as the temperature increases, the area of homogeneity (area covered by bimodal curve)
A. decreases
B. increases
C. remains the same
A. decreases
154
The suitable evaporator for concentration of foaming liquid is
A. long tube evaporator
B. vacuum evaporator
C. short tube evaporator
D. falling film evaporator
A. long tube evaporator
155
Macroscopic transfer of mass between moving fluid and surface which is of different concentration is called
A. molecular diffusion
B. convective mass transfer
C. unsteady-state diffusion
D. all of these
B. convective mass transfer
