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CHE BOARDS ADTL > CPI, PDC, DESIGN > Flashcards

CPI, PDC, DESIGN Flashcards

1
Q

Oxidation of SO2 to SO3 is favored by

A

low temperature and high pressure.

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2
Q

Gun powder, an explosive, comprises of charcoal, sulfur and _________

A

saltpeter

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3
Q

The starting raw material for the manufacture of alum is _______

A

bauxite

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4
Q

Paper pulp produced by kraft/sulfate process is ________

A

strong & fibrous

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5
Q

Claude process of gas liquefaction employs

A

adiabatic expansion against a piston or in a turbine.

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6
Q

Viscose rayon is chemically _______

A

regenerated cellulose acetate

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7
Q

Styrene is produced from ethyl benzene by the process of _______

A

dehydrogenation

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8
Q

Gelatin which is a nitrogenous organic protein is obtained by the hydrolysis of ______

A

collagen

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9
Q

Sucrose content in the raw juice extracted from sugar cane is about ____%

A

15 - 20

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10
Q

Fusel oil is a/an

A

mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).

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11
Q

Styrene-butadiene-rubber (SBR) as compared to natural rubber has _____

A

poorer tensile strength

poorer resistance to oxidation.

greater amount of heat build-up under heavy loading.

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12
Q

Coefficient of thermal expansion of glass is decreased by the addition of ______ during its manufacture.

A

ZnO

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13
Q

The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is

A

oleum

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14
Q

Epoxy resin

A

is a good adhesive

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15
Q

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A

Pollution of water stream by mercury.

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16
Q

Esterification reaction produces

A

soap

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17
Q

Wood charcoal is used for decoloration of sugar because it _________ the colored materials.

A

adsorbs

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18
Q

Producer gas consists mainly of

A

CO, CO2, N2, H2

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19
Q

Neoprene is the trade name of

A

polychloroprene

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20
Q

Sulfur addition in soap is done to

A

cure pimples & dandruff

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21
Q

Phosphate rock is a raw material for the manufacture of

A

phosphoric acid
phosphorous
superphosphates

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22
Q

Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

A

greater tendency of decomposition at elevated temperature.

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23
Q

Which of the following is NOT a raw material used for the manufacture of ordinary glass?

A

Iron oxide

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24
Q

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A

sodium chloride

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25
Q

Pasteurization of milk means

A

killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.

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26
Q

Fusion of bauxite and _______ produces high alumina cement.

A

limestone

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27
Q

_________ process is used for the manufacture of sodium carbonate by ammonia soda process.

A

Solvay

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28
Q

Polycaprolactum is commercially known as

A

nylon-6

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29
Q

Frasch process is for

A

mining sulfur

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30
Q

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A

it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.

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31
Q

W hich is the main reducing agent during production of iron from iron ore in a blast furnace?

A

CO

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32
Q

The drug used in contraceptives is

A

mestranol

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33
Q

Raw materials used for producing ___ cement does not contain iron oxide.

A

white

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34
Q

In the Lurgi coal gasifier

A

large quantity of coal can be processed.

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35
Q

Neon gas is

A

used in color discharge tube.

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36
Q

Which of the following is an undesirable dynamic characteristic of an instrument?

A

Time lag

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37
Q

Pick out the one which is a first order instrument.

A

A.Mercury in glass thermometer (without any covering or air gap)
B. Bare metallic thermometer
C. Bare vapor pressure thermometer * D. All of the above

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38
Q

Load cells are used for the measurement of

A

weight

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39
Q

Which of the following is the dynamic characteristics of an instrument?

A

Fidelity

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40
Q

The _______ of a vapor pressure thermometer is a functioning element.

A

pointer

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41
Q

A negative gain margin expressed in decibels means a/an ______ system.

A

unstable

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42
Q

Thermistor has a high temperature coefficient of resistivity which is used as the sensing element in resistance thermometer. It is a/an

A

solid semiconductor

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43
Q

Flapper nozzle is used in a/an _______ controller.

A

pneumatic

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44
Q

Working principle of radiation pyrometer is based on the

A

Stefan-Boltzman law

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45
Q

Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

A

Thomson effect

46
Q

Dilute wine was initially used as a thermometric liquid to develop temperature scale. The first empirical temperature scale developed was the
scale.

A

Fahrenheit

47
Q

Which of the following is a desirable characteristic of an instrument?

A

High fidelity

48
Q

The operation of a rotameter is based on

A

variable flow area

49
Q

The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an ________ thermocouple.

A

iron-constantan

50
Q

Instrumentation in a plant offers the advantage of

A

A. greater safety of operation
B. better quality of product
C. greater operation economy
* D. all of these

51
Q

W hich of the following temperature measuring instruments need not touch the object whose temperature is being measured?

A

Radiation/infrared pyrometer

52
Q

Thermal conductivity measurement comprises the working principle of a

A

CO2 analyzer

53
Q

Response of a system to a sinusoidal input is called ______ response.

A

frequency

54
Q

The closed loop pole of a stable second order system could be

A

both real and negative

55
Q

Smoke density of the flue gas going out of the chimney is measured by a

A

photo electric cell

56
Q

Temperature measuring instruments are standardized mostly with __________ points of pure substances.

A

both melting and boiling

57
Q

Pick out the first order system from among the following.

A

A. Damped vibrator.
* B.Mercury in glass thermometer kept in boiling water.
C. Interacting system of two tanks in series.
D. Non-interacting system of two tanks in series.

58
Q

The maximum service temperature for fibre glass used as thermocouple wire insulation material is ____ °C.

A

500

59
Q

Which of the following controllers has the least maximum deviation?

A

P-D controller

60
Q

Volumetric expansion is the working principle of the _______ thermometers.

A

mercury in glass

61
Q

Which of the following measurements can be made by the measurement of emf?

A

A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
*D. All of the above

62
Q

A magnetic flowmeter is

A

A. based on the principle of Faraday’s law.
B.capable of measuring the flow rate of slurries and electrolytes.
C.based on the linear relationship between the fluid flow rate and the induced voltage.
*D. All of the above.

63
Q

Zirconia probe is used for the continuous measurement of ____ flue gases going out of the furnace.

A

oxygen in

64
Q

Strain gage pressure transducers are used to measure ______ pressures.

A

gage as well as vacuum
absolute as well as differential

65
Q

Compositional analysis of _______ is done using mass spectrometer.

A

an isotope

66
Q

The function of a transducer is to

A

convert the primary signal into a more useful quantity, usually an electric impulse.

67
Q

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

A

Chromel-constantan

68
Q

_______ is undesirable in thermocouples used in industries.

A

Non-linear relation of emf to temperature

69
Q

Select the correct statement from the following.

A. The frequency response of a pure capacity process is unbounded.
B. The phase lag of a pure time delay system decreases with increasing frequency.
C. The amplitude ratio of a pure capacity process is inversely proportional to frequency.
D.The amplitude ratio of a pure time delay system increases with frequency.

A

C. The amplitude ratio of a pure capacity process is inversely proportional to frequency.

70
Q

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

A

thermocouple

71
Q

The _______ of a vapor pressure thermometer is a secondary element.

A

Bourdon tube

72
Q

Emf developed by a thermocouple while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

A

platinum-platinum+rhodium

73
Q

Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

A

Peltier effect

74
Q

In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the _______ variable.

A

manipulated

75
Q

Typical specifications for design stipulates the gain margin and phase margin to be respectively

A

> 1.7 and >30°

76
Q

The ratio of shear stress to shear strain is called

A

shear modulus

77
Q

Which of the following material is seldom used for pressure vessel construction?

A

Rimmed still

78
Q

Fresh water carrying pipelines in chemical industries are colored with _______ color.

A

sea green

79
Q

25% cut segmental baffle means that the baffle

A

height is 75% of the I.D. of the shell.

80
Q

Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than _____ kilolitres.

A

45

81
Q

Le/D for fully open globe value may be around

A

300

82
Q

Lug support is

A

the most suitable for thick vertical vessel.
same as bracket support.
provided usually for vessels of much smaller height than skirt supported vessels.

83
Q

With increase in the number of shell passes, the value of FT

A

Increases

84
Q

Holes of a sieve tray are arranged in triangular pitch of ____ times the hole diameter.

A

2.5 to 5

85
Q

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of _____
mm

A

5-11

86
Q

The stress developed in a material without any permanent set is called the

A

elastic limit

87
Q

In a shell and tube heat exchanger, the ‘tube pitch’ is defined as the

A

shortest centre to centre distance between adjacent tubes.

88
Q

Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele’s method ?

A

Reflux is not a saturated liquid.

89
Q

The value of fouling factor depends upon the

A
  • characteristic of process fluid.
  • velocity of process fluid containing suspended solids.
  • suspended solids in the fluid.
90
Q

In case of bubble cap distillation column of diameter greater than 1.2 m, the cap diameter is roughly about ___ cm.

A

10

91
Q

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about _____ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.

A

8

92
Q

To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

A

(1.2)^5/3

93
Q

In a heat exchanger, shell side fluid velocity can be changed by changing the tube

A

Layout and pitch

94
Q

Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

A

At the inner surface.

95
Q

It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than

A

0.80

96
Q

A rivetted joint does not fail by _____ of rivets.

A

0.55

97
Q

Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

A

permits the use of more tubes in a given shell diameter.

98
Q

Bracket supports are the most suitable for supporting _______ vessels

A

thick walled vertical

99
Q

In a multi-pass shell and tube heat exchanger, the shell side cross flow area does not depend upon

A. baffle spacing
B. clearance
C. pitch
D. none of these

A

None of these

100
Q

Two iron pipes of the same nominal diameter but different schedule numbers will have the same

A

Inside diameter

101
Q

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about ___ percent.

A

20

102
Q

In chemical process equipment, the conical bottom heads used, usually has an apex angle of

A

60°

103
Q

Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ____
mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.

A

75

104
Q

Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the

A

ultimate stress to working stress.

105
Q

The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about ____ mm of water column per meter height of packing.

A

20-40

106
Q

In perforated plate towers, the
A. hole sizes may be around 1/8” or 3/16”.
B.total hole area may be around 6 to 15% of tower cross-
sectional area.
C. pressure drop is less compared is similar bubble cap towers.
D. all (a), (b) and (c).

A

all of the above

107
Q

The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

A

Ellipsoidal

108
Q

Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

A

Less

109
Q

Pick out the wrong statement pertaining to the design of a basket type evaporator.

A

It is used for high viscosity liquor having large rate of scaling.

110
Q

Speed of the drum of the rotary vacuum filter normally ranges from _____ rpm.

A

0.1 to 2

111
Q

A stuffing box is used for

A

prevention of fluid leakage around moving parts.

CHE BOARDS ADTL (4 decks)

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