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Letchaysaybeejen > Refresher Exam > Flashcards

Refresher Exam Flashcards

1
Q

The science dealing with the study of phenomena at very low temperatures is known as

A. refrigenics
B. cytogenics
C. frozenics
D. cryogenics

A

D. cryogenics

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2
Q

It is a linear polymer which may be reversibly softened by heat and solidified by cooling

A. thermosets
B. polymer
C. thermoplastics
D. copolymer

A

C. thermoplastics

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3
Q

It is obtained from the milky secretion of various plants such us the tree Hevea brasilienses

A. natural rubber
B. Xenoy
C. PAI
D. collagen

A

A. natural rubber

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4
Q

Another name for revolving screen is

A. shaking screen B. vibrating screen
C. trommel screen D. mechanically vibrated screen

A

C. trommel screen

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5
Q

An ideal surface that absorbs all incident radiation regardless of wavelength and direction and is also
considered as perfect emitter is referred to as a

A. gray body
B. black body
C. pin hole
D. black hole

A

B. black body

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6
Q

The total amount of evaporation an evaporator is capable of producing per unit of time.

A. economy
B. steam consumption
C. capacity
D. fouling factors

A

C. capacity

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7
Q

Lanolin is

A. a hydrocarbon oil
B. a plant wax
C. a hydrocarbon wax
D. fat from sheep’s wool

A

D. fat from sheep’s wool

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8
Q

What is kaolinite?

A. aluminum silicate
B. potassium silicate
C. MgSO4-7H2O
D. magnesium silicate

A

A. aluminum silicate

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9
Q

. What is the organic molecular formula for a certain organic polychlorinated biphenyl similar to
chlorinated insecticides if the compound contains 3.95% carbon, 1.131% hydrogen, and 58.95%
chlorine with a molecular mass of 360.89?

A. C14H8Cl14
B. C6H2Cl13
C. C10H8Cl12
D. C12H6Cl1

A

D. C12H6Cl1 - change to C12H4Cl6

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10
Q

Determine the number of days it will take for one milligram of rubidium to decay to 0.6 mg. (Note: Rb-83 = half life = 86.2 days)

A. 132
B. 98
C. 63
D. 211

A

C. 63

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11
Q

Natural gas containg 95% methane and 5% nitrogen by volume is burned in a furnace with 15%
excess air. How much air at 289 K and 101.3 kPa is required if the fuel consumption is 10 m3/s
measured at 289 K and 101.3 kPa

A. 78.8 m3/s
B. 92.1 m3/s
C. 103.9 m3/s
D. 116.4 m3/s

From the data , calculate the mass flow rate of the flue gas.
A. 110.6 kg/s
B. 133.28 kg/s
C. 155.8 kg/s
D. 170.9 kg/s

A

C. 103.9 m3/s and B. 133.28 kg/s

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12
Q

A force of 1 N acting through a distance of one meter.

A. dyne
B. Joule
C. erg
D. slug

A

B. Joule

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13
Q

The current through a metal conductor is proportional to the potential difference between its ends

A. Coulomb’s law
B. Len’s law
C. Faraday’s law
D. Ohm’s law

A

D. Ohm’s law

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14
Q

What is the linear momentum units?
A. Pa-s
B. N/s
C. N-s
D. N/s²

A

C. N-s

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15
Q

An electrically neutral object has

A.no charge at all
B.equal amount of negative and positive charges
C. been stripped of all electrons
D. been stripped of all protons

A

B.equal amount of negative and

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16
Q

The second is the duration of radiation of what radioactive element?

A. magnesium
B. krypton
C. cesium
D. platinum

A

C. cesium

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17
Q

1 J = ?
A. 1E6 ergs
B. 1E8 ergs
C. 1E7 ergs
D. 1E9 ergs

A

C. 1E7 ergs

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18
Q

What is the value of the universal gravitational constant?

A. 6.67 E 11 m²-kg/s²
B. 6.67 E 11 m³-kg/s²
C. 6.67 E -11 m³-kg/s²
D. 6.67 E -11 m³/kg-s²

A

D. 6.67 E -11 m³/kg-s²

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19
Q

The declining balance method of depreciation is also known as

A. Investor’s method
B. Matheson method

A

B. Matheson method

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20
Q

The first derivative of kinetic energy with respect to time is

A. power
B. momentum
C. work
D. force

A

A. power

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21
Q

The amount of money required for the operation of a business including inventories is

A. cost of sales
B. fixed cost
C. working capital D. capital cost

A

C. working capital

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22
Q

Rentals for land, building and equipment including insurance premium are

A. incremental cost B. marginal cost
C. operating cost
D. fixed cost

A

D. fixed cost

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23
Q

The moment of inertia of any plane figure can be expressed in units of length to the ___ power.

A. second
B. third
C. first
D. fourth

A

D. fourth

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24
Q

The volume of any solid of revolution is equal to the generating area times the circumference of
the circle described by the centroid of the area. This commonly known as :

A. First proposition of Pappus
C. Second proposition of Pappus
B. Simpson’s rule D. Cavalier’s principle

A

C. Second proposition of Pappus

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25
Q

The area of a surface generated by rotating any plane curve about an intersecting axis in its
plane is equal to the product of the length of the curve and the distance traveled by its centroid.

A. First Proposition of Pappus
C. Second Propostion of Pappus
B. Parallel Axis Theorem
D. Second Moment of Inertia

A

A. First Proposition of Pappus

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26
Q

In statistics, the standard deviation measures

A. a standard distance
B. a normal distance
C. central tendency D. dispersion

A

D. dispersion

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27
Q

Benzene melts at 5.5C with a heat of fusion of 2350 cal/mol. Its normal boiling point is 80.1C, and its
heat of vaporization at that temperature is 94.1 cal/g. Calculate the molar entropy of fusion for
benzene in cal/mol-K.

A. 8.44
B. 14.32
C. 20.81
D. 27.55

From the data above, calculate the molar entropy of vaporization for benzene in cal/mol-K.

A. 8.44
B. 14.32
C. 20.81
D. 27.5

A

A. 8.44 and C. 20.81

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28
Q

A fuel furnishes 7000 calories of heat per gram of fuel. Calculate the maximum work in calorie per
gram of fuel which can be obtained from this heat in an engine which is operated with water between
its boiling point and 40°C.

A. 1126
B. 1425
C. 1870
D. 2021

A

A. 1126

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29
Q

Calculate the enthalpy change upon converting 1 mol of ice at -25°C to water vapor at 125°C under a
constant pressure of 1 atm. The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K and
1.84 J/g-K, respectively. For water the heat of fusion is 6.01 kJ/mol, and the heat of vaporization is
40.67 kJ/mol.

A. 40 kJ
B. 48 kJ
C. 56 kJ
D. 60 kJ

A

C. 56 kJ

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30
Q

Esterification is the reaction of carboxylic acid with

A. water
B. alcohol
C. alkyl halide
D. ammonia

A

B. alcohol

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31
Q

Name the compound with the general formula RCOOR’.

A. ether
B. ketones
C. ester
D. aldehyde

A

C. ester

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32
Q

Which organic compound has the functional group –COOH ?

A. ethers
B. ketones
C. aldehydes
D. acids

A

D. acids

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33
Q

To which of the following group does soap belong?

A. esters
B. salts of organic acids
C. amines
D. aldehydes

A

B. salts of organic acids

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34
Q

Which of the following types of reactions occur when a reactant has got a double bond?

A. addition
B. substitution
C. photolysis
D. polymerization

A

A. addition

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35
Q

is used to determine the molecular weight of an oil.

A. Polenske number
B. Iodine number
C. Saponification number
D. Acetyl number

A

C. Saponification number

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36
Q

The radiation that produces the greatest number of ions as it passes through matter is

A. omega
B. beta
C. alpha
D. gamma

A

C. alpha

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37
Q

Teflon is made from

A. polyvinyl chloride
B. polytetrafluoroethane
C. polyacrylonitrile D. polytetrafluoroethylene

A

D. polytetrafluoroethylene

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38
Q

A berl saddle is used so that

A. one can easily ride a horse
C. to reduce a personal problem
B. to increase mass transfer rate
D. to increase heat transfer rate

A

B. to increase mass transfer rate

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39
Q

The ordinate in a psychrometric chart is
A. absolute humidity of dry air C. absolute humidity of humid air
B. saturation temperature
D. dry bulb temperature

A

C. absolute humidity of humid air

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40
Q

The temperature at which the moisture content of humid air exerts a partial pressure equal to its
vapor pressure is the

A. saturation temperature
B. critical temperature
C. ambient temperature
D. dry bulb temperature

A

A. saturation temperature

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41
Q

If the partial pressure of the vapor in a gas-vapor mixture is for any reason less than the equilibrium
vapor pressure of the liquid at the same temperature, the mixture is

A. saturated
B. unsaturated
C. supersaturated D. concentrated

A

B. unsaturated

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42
Q

The maximum number of plates for a given distillation system is obtained at

A. variable reflux
B. minimum reflux
C. maximum reflux D. optimum reflux

A

B. minimum reflux

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43
Q

The triangle whose one corner coincides with the enriching line and the other corner is on the stripping
line, is called the ____.

A. feed plate
B. ideal stage
C. partial condenser
D. middle plate

A

A. feed plate

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44
Q

In a distilling column, the highest pressure will be at

A. the top
B. the feed plate
C. the bottom
D. between the feed plate and the top

A

C. the bottom

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45
Q

. It states that if two thermodynamic systems each are in thermal equilibrium with a third one, then they
are in thermal equilibrium with each other.

A. Zeroith Law of Thermodynamics B. First Law of Thermodynamics
C. Second law of Thermodynamics D. Third Law of Thermodynamics

A

A. Zeroith Law of Thermodynamics

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46
Q

It is the minimum amount of energy that is required to activate atoms or molecules to a condition in
which they can undergo chemical transformation or physical transport.

A. activation energy B. ionization energy
C. potential energy D. reaction energy

A

A. activation energy

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47
Q

In distillation, what do you call the section below the feed plate?

A. rectifying section B. stripping section C. condenser
D. boiler

A

B. stripping section

48
Q

.In distillation, what do you call the section above the feed plate?

A. rectifying section
B. stripping section C. condenser
D. boiler

A

A. rectifying section

49
Q

The standard equipment recommended for automatically carrying out sieve test procedures
with accuracy and dependability.

A. end-shake sieve shaker
B. braun sieve shaker
C. ro-tap shaker
D. dynamic sieve shaker

A

C. ro-tap shaker

50
Q

What subatomic particle has the same mass as proton?

A. electron
B. neutron
C. positron
D. beta particle

A

B. neutron

51
Q

In size reduction, the ratio of the average diameter of the feed to the average diameter of the product is the

A. settling ratio
B. reduction ratio
C. diameter ratio
D. classification ratio

A

B. reduction ratio

52
Q

LPG is normally stored as

A. sublimate
B. gas
C. solid
D. liquid

A

D. liquid

53
Q

Common microorganism used for penicillin manufacture is

A. mold
B. protozoa
C. bacteria
D. algae

A

A. mold

54
Q

Synthetic oil of wintergreen contains

A. ethyl salicylate
B. methyl salicylate
C. benzyl acetate
D. linalyl acetate

A

B. methyl salicylate

55
Q

It brings about fermentation of milk.
A. lactobacilli
B. saccharomyces cerevesie
B. acetobacter
D. penicillium

A

A. lactobacilli

56
Q

The fluid portion occupying the whole portion of a cell.
A. ribosomes
B. vacuole
C. cytoplasm
D. lysosome

A

C. cytoplasm

57
Q

The simplest type of carbohydrate is

A. lactose
B. glucose
C. maltose
D. sucrose

A

B. glucose

58
Q

The product obtained from the hydrolysis of collagen is

A. keratin
B. cortisol
C. gelatin
D. casein

A

C. gelatin

59
Q

.Oxygen gas is prepared in the laboratory by heating ____.

A. manganese oxide
B. salt solution in water
C. mercuric oxide D. potassium chlorate

A

D. potassium chlorate

60
Q

The most important component of pitchblende is

A. thorium
B. Uranium
C. radium
D. polonium

A

B. Uranium

61
Q

The most abundant element in the solar system is

A. hydrogen
B. nitrogen
C. oxygen
D. helium

A

A. hydrogen

62
Q

Which enzyme would you expect to find in greater concentration in the stomach of a baby than in an
adult’s stomach?

A. rennin
B. pepsin
C. chymotrypsin
D. trypsin

A

A. rennin

63
Q

Which product is produced commercially by the Haber process?

A. sulfuric acid
B. ammonia
C. propane
D. calcium

A

B. ammonia

64
Q

The migration of colloidal particles under the influence of electric field is called

A. electrodialysis
B. electrodispersion
C. electrophoresis D. electroosmosis

A

C. electrophoresis

65
Q

Also known as “The Clean Air Act of 1999”.

A. RA 8749
B. PD 984
C. RA 6969
D. PD 600

A

A. RA 8749

66
Q

Class ___ is used for recreation such as bathing, swimming, and skin diving.

A. A
B. B
C. C
D. D

A

B. B

67
Q

A 10 ft ladder leaning against a wall slips its base away at a rate of 2 ft/sec at the instant when the
base is 8 ft from the wall. How fast is the top of the ladder moving down the wall at that instant?

A. -1.5 ft/s
B. +2.67 ft/s
C. -2.67 ft/s
D. +1.5 ft/s

A

C. -2.67 ft/s

68
Q

A 2 mm diameter bronze wire can be twisted through 2 complete turns without exceeding a shearing stress of 80 MPa. Use G = 35 GPa

A. 0.1383 N-m
B. 0.1508 N-m
C. 0.1257 N-m
D. -.1100 N-m

A

C. 0.1257 N-m

69
Q

Situation - A region is enclosed between curves y = x» and y=x+6. The lower boundary is y =x»
and the upper boundary is y=x+6. At the end points of the region, the upper and the lower boundaries have the same y coordinates.
What is the endpoint at the left side of the curves?

A. (-2,4)
B. (+3,9)
C. (-3,9)
D. (+2,4)

What is the endpoint at the right side of the curves?

A. (3,9)
B. (-1,-4)
C. (-3,-9)
D. (2,4)

  1. What is the area of the region?
    A. 13.50
    B. 6.17
    C. 20.83
    D. 9.83
A

A. (-2,4)
A. (3,9)
C. 20.83

70
Q

Situation - Pikatsu initiated playing Toss Coin with his Pokemon friends. Pikatsu started by tossing three coins.
What is the probability that he gets at least two heads?

A. 0.50
B. 0.65
C. 0.75
D. 0.25

What is the probability that Pikatsu gets at least a tail and a head?

A. 0.25
B. 0.80
C. 0.50
D. 0.75

What is the probability that Pikatsu gets three tails?

A. 0.250
B. 0.205
C. 0.375
D. 0.125

A

A. 0.50
D. 0.75
D. 0.125

71
Q

The charge to a simple batch still consists of an equimolar mixture of hexane and heptane. If the
relative volatility of hexane to heptane is 2.0 and 50% of hexane has vaporized, what is the mole
fraction of heptane in the total distillate?

A. 0.37
B. 0.73
C. 0.46
D. 0.52

A

A. 0.37

72
Q

Situation - A solvent recovery system delivers a gas, saturated with benzene vapor containing
CO2, O2 and N2. The gas mixture is at 21 deg C and 14.5 psia pressure. It is compressed to 5 atm and cooled again to 21 C and the benzene removed after compression. The process involved 750 cu ft of the gas mixture. The vapor pressure of benzene at 21 deg C is 1.45 psia.
26. What is the volume in cu ft of the inert gas at the mentioned volume?

A. 675
B. 756
C. 655
D. 567

How many moles of inert gas are present in the gas mixture?

A. 5.71
B. 1.72
C. 7.12
D. 2.17

How many pounds benzene are condensed by the process per 750 cu ft of gas?

A. 13.2
B. 12.2
C. 11.4
D. 14.4

A

A. 675
B. 1.72
B. 12.2

73
Q

A cooling coil, consisting of a single length of tubing through which water is circulated, is provided in a reaction vessel, the contents of which are kept uniformly at 360K by means of a stirrer. The inlet and outlet temperatures of the cooling water are 280K and 320K respectively. What would be the outlet water temperature if the length of the cooling coil were increased by 5 times? Assume the overall heat transfer coefficient to be constant over the length of the tube and independent of the water temperature.

A. 312.1 K
B. 320 K
C. 338.6 K
D. 357.5 K

A

D. 357.5 K

74
Q

In an oil cooler, water flows at the rate of 360 kg/h per tube through metal tubes of outer diameter 19 mm and thickness 1.3 mm, along the outside of which oil flows in the opposite direction at the rate of 6.675 kg/s per tube. If the tubes are 2 m long and the inlet temperatures of the oil and water are 370K and 280K respectively, what will be the outlet oil temperature? The coefficient of heat transfer
on the oil side is 1.7 kW/m²-K and on the water side 2.5 kW/m²-K and the specific heat of the oil is 1.9 kJ/kg-K.

A. 304 K
B. 324 K
C. 344K
D. 364 K

A

B. 324 K

75
Q

Which does not belong to the group?

A. Cu
B. B
C. Si
D. As

A

A. Cu

76
Q

What bond posses the highest thermal and electrical conductivity?

A. ionic bond
B. metallic bond
C. covalent bond
D. hydrogen bond

A

B. metallic bond

77
Q

A salt that is hammered into pieces is a characteristic of a material pertaining to its

A. brittleness
B. malleability
C. ductility
D. volatility

A

A. brittleness

78
Q

Bauxite is an oxide mineral of

A. Ba
B. Bi
C. B
D. Al

A

D. Al

79
Q

Which of the following has the greatest affinity to electrons?

A. Na
B. Br
C. Cl
D. K

A

C. Cl

80
Q

Elements in a given period have the same

A. atomic weight
B. maximum azimuthal quantum number
C. maximum principal quantum number
D. valence electron structure

A

C. maximum principal quantum number

81
Q

Hydrogen is how many percent on the earth’s crust?

A. 1% by volume
B. 10% by weight
C. 10% by volume D. 1% by weight

A

D. 1% by weight

82
Q

When the temperature of a solid is raised, it expands in all directions. Certain crystals are found to have different expansivities along different axes. However, many of the common materials have the same properties in all directions. The \latter substances are called

A. isotropic substances
B. isogonic substances
C. isotopic substances
D. isothermal

A

A. isotropic substances

83
Q
  1. Among the intermolecular forces of attraction, which one is present in CCl4?

A. London dispersion forces
C. dipole-dipole force
B. hydrogen bonding
D. network covalent

A

A. London dispersion forces

84
Q

.Which of the following when present in water can lead to brown staining in sanitary ware?

A. fluorides
B. iron and manganese
C. carbonates
D. nitrates

A

B. iron and manganese

85
Q

.In which of the following is the size of particles increasing?

A. colloids, solution, suspension
C. solution, suspension, colloids
B. colloids, suspension, solution
D. suspension, solution, colloids

A

C. solution, suspension, colloids

86
Q

It is a portable flatform on which packaged materials can be handled and stored.

A. pallets
B. steel drums
C. hopper trucks
D. baler bags

A

A. pallets

87
Q

What is the general formula for an aldehyde?

A. R-CO-OH
B. R-CO-H
C. R-O-R
D. R-OH

A

B. R-CO-H

88
Q

What is the general formula for an alcohol?

A. R-CO-OH
B. R-CO-H
C. R-O-R
D. R-OH

A

D. R-OH

89
Q

What is the reciprocal of sinking fund factor?

A. single payment present worth factor
B. single payment compound amount factor
C. capital recovery factor
D. uniform series compound amount factor

A

D. uniform series compound amount factor

90
Q

The reciprocal of capital recovery factor is

A. uniform series present worth factor
B. uniform series compound amount factor
C. sinking fund factor
D. single payment present worth factor

A

A. uniform series present worth factor

91
Q

A magician rotates an open bucket containing water vertically with a radius of 0.5 m. Without spilling a drop of water on the floor, what must be the velocity?

A. 24.3 rpm
B. 34.8 rpm
C. 42.3 rpm
D. 55.1 rpm

A

C. 42.3 rpm

92
Q

A plant can produce 300 ceramic plates per working day. The direct cost for producing each
plate is P25, the overhead cost is P150,000 per year and the fixed cost is P450,000 per year. If
the plant operates 300 days in a year , by how much should the plates be sold in pesos per
dozen to realize a gross profit of 20% over total production cost?

A. P420
B. P432
C. P456
D. P445

A

C. P456

93
Q

Oil, water and ___ will form a stable emulsion.
A. butter
B. soap
C. starch
D. margarine

A

C. starch

94
Q

At triple point, what is the variance, F = __, where it is invariant?

A. 0
B. 2
C. 1
D. 3

A

A. 0

95
Q

How many independent variables must be specified in order to define completely a system of pure liquid water?

A. 2
B. 0
C. 1
D. more than 3

A

A. 2

96
Q

The number of degrees of freedom of an ethanol-water system in equilibrium with its vapor is

A. 3
B. 2
C. 1
D. 0

A

B. 2

97
Q

When carbon dioxide dissolves in water, ____ is formed.

A. carbon monoxide
B. carbonic acid
C. sodium carbonate
D. calcium carbonate

A

B. carbonic acid

98
Q

Process of breaking down a large isotope into smaller isotopes.

A. nuclear fission
B. beta particle emission
C. nuclear fusion
D. gamma ray emission

A

A.nuclear fission

99
Q

A 1.038 M sucrose solution has a density of 1.1 g/ml. Calculate the molality of the solution.

A. 1.39 m
B. 2.15 m
C. 1.89 m
D. 2.30 m

A

A. 1.39 m

100
Q

The percent composition of an unknown element X in CH3X is 32%. Which of the following is element X?

A. F
B. Na
C. Cl
D. Li

A

D. Li

101
Q

What is the heat needed to raise 1 molecule of water by 10ºC in ergs?

A. 1.3E-21
B. 2.6E-12
C. 2.6E-14
D. 1.3E-12

A

A. 1.3E-21

102
Q

Vinegar with a strength of 4.63% (by weight) acetic acid is pumped into a vat to which 2200 lb of 36% acetic acid is added. The resulting mixture contains 8.50% acid. How much of this 8.50% acid solution
is in the vat?

A. 17833 lb
B. 16433 lb
C. 15488 lb
D. 14210 lb

A

A. 17833 lb

103
Q

The property of a porous body which permits a gas or a liquid to flow through it is

A. diffusion
B. permeability
C. osmosis
D. viscosity

A

B. permeability

104
Q

What is the osmotic pressure of a solution that contains 0.10 mol of sodium chloride dissolved in a liter
of water at 25 C?

A. 1.75 atm
B. 2.29 atm
C. 3.02 atm
D. 4.88 atm

A

D. 4.88 atm

105
Q

The point at which an appreciable elongation occurs on a material under stress without further
increasing the load is

A. equilibrium point
B. critical point
C. safety point
D. yield point

A

D. yield point

106
Q

The type of loading where fatigue failure occurs.

A. high load
B. repeated load
C. plane load
D. static load

A

B. repeated load

107
Q

The highest ordinate on the stress-strain curve.

A. ultimate strength
B. yield strength
C. rupture point
D. proportional limit

A

A. ultimate strength

108
Q

What is the acid test ratio?

A. the ratio of owners equity to total current liabilities
B. the ratio of all assets to total liabilities
C. the ratio of current assets (exclusive of inventory) to total current liabilities
D. the ratio of profit after taxes to equity

A

C. the ratio of current assets (exclusive of inventory) to total current liabilities

109
Q

The correct unit for the specific rate constant for a first order reaction is

A. L²/mol²-min
B. mol/L-min
C. L³/mol³-min
D. 1/min

A

D. 1/min

110
Q

Reactions whereby reactants proceed along several paths and give different products are

A. polymeric reactions
B. reversible reactions
C. parallel reactions
D. consecutive reactions

A

D. parallel reactions

111
Q
  1. In a phase diagram for two miscible substances, composition of the liquid phase is equal to that of the
    solid phase at which of the following?

A. eutectic point
B. freezing point
C. azeotropic point D. triple point

A

A. eutectic point

112
Q

The transport number of an ion is determined using which method?

A. electrolysis
B. viscosity measurement
C. Hittorf’s method D. chromatography

A

C. Hittorf’s method

113
Q

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 25ºC. If there are no heat losses, what is the change in entropy of the oil and casting considered together?

A. 26.13 kJ/K
C. -16.33 kJ/K
B. 9.80 kJ/K
D. 0

A

B. 9.80 kJ/K

114
Q

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 25ºC. If there are no heat losses, what is the change in entropy of the oil and casting considered together?

A. 26.13 kJ/K
C. -16.33 kJ/K
B. 9.80 kJ/K
D. 0

A

B. 9.80 kJ/K

115
Q

A hydrocarbon mixture (15mol% methane, 15% ethane, 25%propane, 20% isobutene, 20%n-butane, and 5%n-pentane) is flashed into a separator at 80F and 150 psia. Fifty two percent of the mixture leaves the separator as liquid. What is the mole fraction of methane of this liquid? K values; methane, 17.0; ethane, 3.1; propane, 1.0; isobutene, 0.44; n-butane, 0.32; n-pentane, 0.096.

A. 0.2735
B. 0.2500
C. 0.0747
D. 0.0173

A

D. 0.0173

116
Q

In an oil cooler, 216 kg/h of hot oil enters a thin metal pipe of diameter 25 mm. An equal mass of
cooling water flows through the annular space between the pipe and a larger concentric pipe; the oil and water moving in opposite directions. The oil enters at 420 K and is to be cooled to 320 K. If the water enters at 290 K, what length of pipe will be required? Take coefficients of 1.6 kW/m2 K on the oil side and 3.6 kW/m2 K on the water side and 2.0 kJ/kg K for the specific heat of the oil.

A. 1.45 m
B. 8.75 m
C. 2.67 m
D. 7.42 m

A

C. 2.67 m

Letchaysaybeejen (10 decks)

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