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Coaching Series > COACHING DAY2 > Flashcards

COACHING DAY2 Flashcards

1
Q

Fresh water carrying pipelines in chemical industries are colored with?

A

Sea green

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2
Q

Which of the following materials 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 _______ kiloliters

A

45 kiloliters

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6
Q

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

A

Increases also

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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 a 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 a 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 cm

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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 the 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flowrate

A

8 times

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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 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 the raschig ring, which results in an area increase of about ______

A

20%

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18
Q

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

A

less

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19
Q

_______ tray arrangement is recommended for distillation columns having diameter up to 4ft.

A

Cross flow tray

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20
Q

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

A

q = 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 characterstic of an instrument?

A

Time lag

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24
Q

Response of a system to a sinusoidal input is called ________

A

frequency response

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25
Q

Mass transfer rate between two fluids 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

Total reflux in a distillation operation requires minimum?

A

number of plates

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28
Q

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

A

Relative volatility is reasonably constant

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29
Q

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

A

natural

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30
Q

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

A

Allowable vapor velocity

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31
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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32
Q

Saddle supports are used for supporting _______ vessels

A

Horizontal Cylindrical

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33
Q

Solvent Extracted oils
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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34
Q

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

A

Nitric Acid

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35
Q

The purpose of tanning in the leather industry is to

A

Stiffen the leather

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36
Q

Kaoline is a/an

A

Refractory material

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37
Q

Phenol is mainly used

A

To produce phenol formaldehyde

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38
Q

The main constituent of dolomite is

A

MgCO3 - Magnesium Carbonate

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39
Q

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

A

Shift Conversion

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40
Q

Bleaching action of Bleaching powder is due to its ________ properties

A

Oxidizing

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41
Q

Portland cement consists mainly of

A

CaO & SiO2

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42
Q

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

A

pyrex

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43
Q

Mannheim furnace is used in the manufacture

A

HCl - Hydrochloric acid

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44
Q

Thermosetting material

A

are cross-linked molecules

45
Q

_______iron is the purest form of iron

A

Wrought Iron

46
Q

Enamels

A

give good glossy finish

47
Q

Black liquor is converted into white liquor by:

A

evaporation and burning the concentrate followed by causticisation of products

48
Q

Varnish does not contain

A

Pigments

49
Q

liquor poisoning generally occurs due to the presence of _____in it

A

methyl alcohol (methanol)

50
Q

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

A

Packed Column

51
Q

Neoprene is chemically known as

A

Polychlorepene

52
Q

Molecular weights of polymers are in the range of

A

10^2 to 10^7

53
Q

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

A

allowable gas and liquid velocity

54
Q

Vertical vessels are not supported by

A

Saddles

55
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.

56
Q

Rivets are generally specified by the

A

Shank Diameter

57
Q

What is an Ore?

A

substance in which a metal can be extracted from it

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 80kg 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-Thompson expansion)

62
Q

The major use of butadiene

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 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 a yellow pigment?

A

Ferrous sulphate

68
Q

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

A

Freeze drying

69
Q

Sulpuhric acid is mainly used in the ________ industry

A

Fertilizer

70
Q

Main use of hydrazine

A

Rocket Fuel

71
Q

Main use of liquid nitrogen

A

Refrigerative cooling

72
Q

Raw material required for the manufacture of ________ is acetylene and hydrochloric acid

A

vinyl chloride

73
Q

Chemical formula of oleum

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

32R

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

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

CO2 is the strongest paramagnetic gas

82
Q

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

A

Unstable

83
Q

Thermistors, which have a high temperature coefficient of resistivity, are used as the sensing element in resistance thermometer. it is a/an

A

Solid semi-conductors

84
Q

Flapper nozzle is used in a/ an _______ controller

A

pneumatic

85
Q

The 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 homogenous wire to the temperature difference

A

Thompson effect

87
Q

Dilute wine was used as a thermometric liquid initially to develop temperature scales. The 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 Fidelity

89
Q

The 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

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 equipments

A

60 degrees

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 baffles in space

94
Q

The ratio of pressure forces to inertial forces is called the ________ number

A

Euler

95
Q

The ratio of the 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

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

Most commonly used joint in the underground pipe lines is the

A

Sleevejoint

102
Q

Water hammer in a pipeline results from the

A

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

103
Q

Maxwell’s thermodynamic relations applies to the

A

chemical systems in equilibrium

104
Q

Which of the following is not an explosive?

A

CMC

105
Q

If a nuclear reactor produces more fissile nuclear fuels that are consumed, then it is called a _____________ reactor

A

breeder

106
Q

Foot valves provided in pumps are ________ valves

A

directional control

107
Q

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

A

Steel

108
Q

________ addition increases the depth of hardness of steel

A

Chromium

Coaching Series (2 decks)

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