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ChE Boards > Coaching: Day 2 Concepts > Flashcards

Coaching: Day 2 Concepts Flashcards

1
Q

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

A

Sea Green

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2
Q

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

A

Rimmed Steel

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3
Q

25% cut segmental baffle means that the baffle

A

height is 75% of the ID of the shell

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4
Q

The ratio of shear stress to shear strain is called

A

Shear Modulus

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5
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

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6
Q

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

A

increases

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7
Q

Le/D for fully open globe value may be around

A

300

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8
Q

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

A

2.5 to 5

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9
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

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10
Q

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

A

10

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11
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

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12
Q

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

A

layout and pitch

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13
Q

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

A

0.8

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14
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

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15
Q

Bracket supports are the most suitable for supporting __________ vessels.

A

thick walled vertical

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16
Q

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

A

inside diameter

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17
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

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18
Q

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

A

less

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19
Q

______ tray arrangement is recommended for distillation column having diameter up to 4 ft

A

Cross flow

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20
Q

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

A

less

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21
Q

What is the value of ‘q’ for saturated liquid feed to a distillation column?

A

1

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22
Q

The main purpose of providing stepping on the trays is to

A

facilitate handling of large flow rate of liquid

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23
Q

Needle valves are generally not used for

A

very large diameter pipes

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24
Q

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

A

time lag

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25
Q

Response of a system to a sinusoidal input is called __________ response

A

frequency

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26
Q

Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

A

chemical properties

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27
Q

Which of the following is the most suitable for extraction in a system having very low density difference?

A

centrifugal extractor

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28
Q

Total reflux in a distillation operation requires minimum

A

number of plates

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29
Q

Fenske’s equation for determining the minimum number of theoretical stages in distillation column holds good, when the

A

relative volatility is reasonably constant.

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30
Q

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

A

natural

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31
Q

Which of the following is used to set the diameter of the distillation column?

A

Allowable vapor velocity.

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32
Q

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

A

Sorel-Lewis method.

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33
Q

Saddle supports are used for supporting __________ vessels.

A

Horizontal Cylindrical

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34
Q

Solvent extracted oil

A

none of these

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35
Q

Which of the following is not required in the manufacture of soda ash by Solvay process?

A

Nitric acid

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36
Q

The purpose of tanning in leather industry is to

A

stiffen the leather.

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37
Q

Kaoline is a/an

A

refractory material

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38
Q

Phenol is mainly used

A

to produce phenol formaldehyde

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39
Q

Main constituent of dolomite is

A

MgCO3

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40
Q

Conversion of CO to CO2 by steam in presence of a catalyst is called

A

shift conversion

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41
Q

Bleaching action of bleaching powder is due to its __________ properties.

A

oxidizing

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42
Q

Portland cement consists mainly of

A

CaO and SiO2

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43
Q

__________ glass has the lowest coefficient of thermal expansion and hence is more heat resistant.

A

Pyrex

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44
Q

Mannheim furnace is used in the manufacture of

A

hydrochloric acid

45
Q

Thermosetting materials

A

are cross-linked molecules.

46
Q

__________ iron is the purest form of iron.

A

Wrought

47
Q

Enamels

A

give good glossy finish.

48
Q

Black liquor is converted into white liquor by

A

evaporation and burning the concentrate followed by causticisation of products.

49
Q

Varnish does not contain

A

pigment

50
Q

Liquor poisoning generally occurs due to the presence of __________ in it.

A

methyl alcohol

51
Q

Which of the following same diameter columns gives lowest pressure drop per unit height?

A

Packed Column

52
Q

Neoprene is chemically known as

A

Polychlorepene

53
Q

Molecular weights of polymers are in the range of

A

10^2 to 10^7

54
Q

In distillation columns, the number of bubble caps per tray primarily depends upon the

A

allowable gas and liquid velocities.

55
Q

Vertical vessels are not supported by

A

saddles

56
Q

Pick out the wrong statement about the design of a sieve plate column.

A

Minimum recommended downcomer residence time for the disengagement of entrained vapor is the same for both foaming and non-foaming liquids, which is about 20 seconds.

57
Q

Rivets are generally specified by the

A

shank diameter

58
Q

Oleum produces fumes of

A

SO3

59
Q

20% oleum means that in 100 kg oleum, thereare 20 kg of

A

SO3 and 80 kg of H2SO4

60
Q

Inversion of sucrose produces

A

glucose

61
Q

Linde process of gas liquefaction employs

A

adiabatic expansion through a throttle valve (Joule-Thomson expansion)

62
Q

The major use of butadiene is

A

in the manufacture of synthetic rubber.

63
Q

Hydrogenation of oil takes place in a/an __________ reactor.

A

trickle bed reactor

64
Q

Fatty material used in soap making is

A

tallow

65
Q

__________ glass is used for the manufacture of optical glass.

A

flint

66
Q

Favorable conditions for the liquefaction of gases in general are

A

high pressure & low temperature.

67
Q

Which of the following is an yellow pigment?

A

Ferrous sulphate

68
Q

Common salt is generally not produced commonly by __________ method from brine.

A

freeze drying

69
Q

Sulphuric acid is mainly used in the __________ industry.

A

fertilizer

70
Q

Main use of hydrazine is

A

as a rocket fuel

71
Q

Main use of liquid nitrogen is in

A

refrigerative cooling.

72
Q

Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.

A

vinyl chloride

73
Q

Chemical formula of oleum is

A

H2S2O7

74
Q

Yellow glycerine is made into white, using

A

activated carbon

75
Q

Gypsum is chemically

A

calcium sulfate

76
Q

Zeigler process

A

produces high density polyethylene.

77
Q

Sea weeds are an important source of

A

iodine

78
Q

Which of the following is not the triple point of water?

A

32°R

79
Q

Load cells are used for the measurement of

A

weight

80
Q

Pick out the wrong statement.

A

CO2 is the strongest paramagnetic gas.

81
Q

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

A

unstable

82
Q

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

A

solid semi-conductor

83
Q

Flapper nozzle is used in a/an __________ controller.

A

pneumatic

84
Q

Working principle of radiation pyrometer is based on the

A

Stefan-Boltzman law

85
Q

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

A

Thomson effect

86
Q

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

A

Fahrenheit scale

87
Q

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

A

High fidelity

88
Q

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

A

frequency

89
Q

Bubble cap tray is the most commonly used tray in large distillation column, because

A

of its flexibility and nearly constant efficiency under varying conditions of operation.

90
Q

Apex angle of conical heads used in the bottom heads of chemical process equipment is usually

A

60 degrees

91
Q

Nominal size of a pipe is an indication of its __________ diameter.

A

approximate

92
Q

In shell and tube heat exchangers, straight tie rods are used to

A

hold baffle in space.

93
Q

The ratio of pressure forces to inertial forces is called the __________ number.

A

Euler

94
Q

The ratio of inertial forces to elastic forces is called the __________ number.

A

Mach

95
Q

The friction factor is

A

none of these

96
Q

If Blausius or Darcey friction factor is ‘f1’ then the Fanning friction factor is equal to

A

f1/4

97
Q

The fluid property, due to which, mercury does not wet the glass is

A

surface tension

98
Q

When the momentum of one fluid is used for moving another fluid, such a device is called a/an

A

jet pump

99
Q

The normal stress is the same in all directions at a point in a fluid, when the fluid is

A

having no motion of one fluid layer relative to the other.

100
Q

Most commonly used joint in the underground pipe lines is the

A

sleevejoint

101
Q

Water hammer in a pipeline results from the

A

rapid pressure change due to a rapid change in the rate of flow.

102
Q

Maxwell’s thermodynamic relations applies to the

A

chemical systems in equilibrium.

103
Q

Which of the following is not an explosive?

A

CMC

104
Q

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

A

breeder

105
Q

Foot valves provided in pumps are __________ valves.

A

directional control

106
Q

The most suitable material of construction for a sewer to carry sewage under high pressure is

A

steel

107
Q

__________ addition increases the depth of hardness of steel.

A

chromium

108
Q

Pick out the one which is a first order instrument.

A

All (a), (b), (c) mercury, bare metallic thermometer, bare vapor pressure thermometer

ChE Boards (4 decks)

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