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Day 1 - Physical and Chemical Principles > Coaching > Flashcards

Coaching Flashcards

1
Q

Which would make a more efficient cold compress, ethanol or methanol?

A

Methanol

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2
Q

What is the color of nickel chloride?

A

Yellow

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3
Q

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

A

Sea Green

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4
Q

Which material is seldom used for pressure vessel construction?

A

Rimmed Steel

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5
Q

25 percent cut segmental baffle means that the baffle

A

Height is 75% of the ID of the shell

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6
Q

The ratio of shear stress to shear strain is called

A

Shear modulus

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7
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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8
Q

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

A

Increases

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9
Q

Le/D for fully open globe value may be around

A

300

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10
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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11
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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12
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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13
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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14
Q

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

A

Layout and pitch

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15
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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16
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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17
Q

Bracket supports are the most suitable for supporting __________ vessels.

A

thick-walled vertical

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18
Q

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

A

Inside diameter

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19
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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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

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

A

Cross flow

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22
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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23
Q

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

A

1

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24
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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25
Q

Needle valves are generally not used for

A

Very large diameter pipes

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26
Q

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

A

Time lag

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27
Q

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

A

Frequency

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28
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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29
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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30
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

B. number of plates

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31
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

A. relative volatility is reasonably constant.

32
Q

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

A

Natural

33
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

C. Allowable vapor velocity.

34
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

A. Sorel-Lewis method.

35
Q

Saddle supports are used for supporting __________ vessels.

A

Horizontal cylindrical

36
Q

Solvent extracted oil

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

A

D. none of these

37
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

B. Nitric acid

38
Q

Kaoline is a/an

A

Refractory material

39
Q

Phenol is mainly used

A

to produce phenol formaldehyde

40
Q

Main constituent of dolomite is

A

MgCO3

41
Q

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

A

shift conversion

42
Q

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

A

Oxidizing

43
Q

Portland cement consists mainly of

A

CaO and SiO2

44
Q

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

A

Pyrex

45
Q

Mannheim furnace is used in the manufacture of

A

Hydrochloric acid

46
Q

Thermosetting materials

A

are cross-linked molecules

47
Q

__________ iron is the purest form of iron.

A

Wrought

48
Q

Enamels

A

give good glossy finish

49
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

50
Q

Varnish does not contain

A

pigment

51
Q

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

A

Methyl alcohol

52
Q

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

A

Packed columns

53
Q

Neoprene is chemically known as

A

Polychlorepene

54
Q

Molecular weights of polymers are in the range of

A

10^2 to 10^7

55
Q

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

A

allowable gas and liquid velocities.

56
Q

Vertical vessels are not supported by

A

saddles

57
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.

58
Q

Rivets are generally specified by the

A

shank diameter

59
Q

Rivets are generally specified by the

A

a metal can be economically extracted from it.

60
Q

Oleum produces fumes of

A

SO3

61
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.

62
Q

Inversion of sucrose produces

A

Glucose

63
Q

Linde process of gas liquefaction employs

A

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

64
Q

The major use of butadiene is

A

in the manufacture of synthetic rubber.

65
Q

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

A

Trickle bed reactor

66
Q

Fatty material used in soap making is

A

tallow

67
Q

__________ glass is used for the
manufacture of optical glass.

A

Flint

68
Q

Favorable conditions for the liquefaction of gases in general are

A

High pressure and low temperature

69
Q

Which of the following is a yellow pigment?

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

A

C.

70
Q

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

A

Freeze drying

71
Q

Sulphuric acid is mainly used in the
__________ industry.

A

Fertilizer

72
Q

Main use of hydrazine is

A

Rocket fuel

73
Q

Main use of liquid nitrogen is in

A

Refrigerative cooling

74
Q

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

A

Vinyl chloride

75
Q

Chemical formula of oleum is

A

H2S2O7

76
Q

Yellow glycerine is made into white, using

A

Activated carbon

Day 1 - Physical and Chemical Principles (8 decks)

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