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COACHING- ARC > DAY 2- CEP > Flashcards

DAY 2- CEP 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 percent 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 to 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

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

A

Cross Flow

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19
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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20
Q

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

A

1

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21
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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22
Q

Needle valves are generally not used for

A

very large diameter pipes

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23
Q

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

A

time lag

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24
Q

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

A

frequency

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25
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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26
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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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. reboiler load
B. number of plates
C. condenser load
D. all (a), (b) and (c)

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.
B. mixture (to be separated) shows negative deviation
from ideality.
C. mixture (to be separated) shows positive deviation
from ideality.
D. multicomponent distillation is involved.

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. Number of theoretical plates.
B. Static submergence.
C. Allowable vapor velocity.
D. Length of straight rectangular weir on cross-
flow tray.

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.
B. McCabe-Thiele’s method.
C. Ponchon-Savarit method.
D. none of these.

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. has low free fatty acid content.
B. is odorless.
C. has more of unsaturates.
D. none of these.

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. Ammonia
B. Nitric acid
C. Limestone
D. None of these

A

Nitric Acid

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36
Q

The purpose of tanning in leather industry is to

A

to 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.
B. multi-effect evaporation only.
C. selective liquid extraction.
D. extractive distillation.

A

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. An increased weir height improves the tray efficiency at the cost of high plate
pressure drop; optimum wear height being 40-90 mm for column pressure above
atmospheric and 6-12 mm for vacuum columns.
B. For segmental downcomers, the chord length is 60-80% of the column
diameter. An initial value of downcomer area of 12% is taken in the design.
C. Width of the calming section provided at the inlet and outlet sides of the plate is
75 mm for column diameter below 1.5 meters and 100 mm for larger diameter
columns.
D. 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.

A

D

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, there
are 20 kg of
A. SO3 and 80 kg of H2SO4
B. H2SO4 and 80 kg of SO3
C. SO3 for each 100 kg of H2SO4
D. none of these.

A

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. Titanium dioxide C. Ferrous sulphate
B. Lead chromates D. Zinc sulfides

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

rocket fuel

71
Q

Main use of liquid nitrogen is in

A

refrigerant 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
B. 492°R
C. 273°K
D. 32°F

A

A. 32°R

79
Q

Pick out the one which is a first order instrument.
A. Mercury in glass thermometer (without any
covering or air gap).
B. Bare metallic thermometer.
C. Bare vapor pressure thermometer.
D. All (a), (b) and (c).

A

D. All (a), (b) and (c).

80
Q

Load cells are used for the measurement of

A

weight

81
Q

Pick out the wrong statement.
A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
B. CO2 is the strongest paramagnetic gas.
C. Paramagnetic susceptibility of gases decreases with
temperature.
D. Paramagnetic susceptibility of gases permits the
measurement of their concentration.

A

B. CO2 is the strongest paramagnetic gas.

82
Q

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

A

unstable

83
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

84
Q

Flapper nozzle is used in a/an
__________ controller.

A

pneumatic

85
Q

Working principle of radiation
pyrometer is based on the

A

Stefan-Boltzman law

86
Q

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

A

Thomson effect

87
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

88
Q

Which of the following is a desirable
characteristic of an instrument ?
A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility

A

B. High fidelity

89
Q

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

A

Frequency

90
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.

91
Q

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

A

60 deg

92
Q

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

A

approximate

93
Q

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

A

hold baffle in space.

94
Q

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

A

Euler

95
Q

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

A

Mach

96
Q

The friction factor is
A. always inversely proportional to the Reynolds number.
B. not dimensionless.
C. not dependent on the roughness of the pipe.
D. none of these.

A

None of these

97
Q

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

A

f1/4

98
Q

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

A

surface tension

99
Q

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

A

jet pump

100
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.

101
Q

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

A

jet pump

102
Q

Most commonly used joint in
the underground pipe lines
is the

A

sleevejoint

103
Q

Water hammer in a pipeline
results from the

A

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

104
Q

Maxwell’s thermodynamic relations
applies to the

A

chemical systems in equilibrium.

105
Q

Which of the following is not an explosive ?
A. TNT
B. CMC
C. RDX
D. Lead azide

A

CMC

106
Q

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

A

Breeder

107
Q

Foot valves provided in pumps
are __________ valves.

A

directional control

108
Q

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

A

steel

109
Q

__________ addition increases
the depth of hardness of steel.

A

chromium

COACHING- ARC (3 decks)

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