Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Che > adkasdas > Flashcards

adkasdas Flashcards

1
Q

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

A

Rimmed Steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

25 per cent cut segmental baffle means that
the baffle

A

Height is 75% of the ID of the

shell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Le/D for fully open globe value may be around

A

300

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

2.5 to 5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

10

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

layout and pitch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

0.8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Bracket supports are the most suitable for
supporting __________ vessels.

A

thick walled vertical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

outside diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

Cross flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The main purpose of providing stepping on the
trays is to

A

facilitate handling of large flow

rate of liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Needle valves are generally not used for

A

very large diameter pipes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

time lag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

A

chemical properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

centrifugal extractor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Total reflux in a distillation operation requires
minimum
A. reboiler load C. condenser load
B. number of plates D. all (a), (b) and (c)

A

B. number of plates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

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

A

natural

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Saddle supports are used for supporting
__________ vessels.

A

Horizontal Cylindrical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Which of the following is not required in the
manufacture of soda ash by Solvay process ?
A. Ammonia C. Limestone
B. Nitric acid D. None of these

A

B. Nitric acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Kaoline is a/an

A

refractory material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Phenol is mainly used

A

to produce phenol

formaldehyde

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Main constituent of dolomite is

A

MgCO3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

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

A

shift conversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

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

A

oxidizing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Portland cement consists mainly of

A

CaO and SiO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

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

A

Pyrex

37
Q

Mannheim furnace is used in the manufacture
of

A

hydrochloric acid

38
Q

Thermosetting materials

A

are cross-linked molecules.

39
Q

__________ iron is the purest form of iron.

A

Wrought

40
Q

Enamels

A

give good glossy finish.

41
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.

42
Q

Varnish does not contain

A

pigment

43
Q

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

A

Packed Column

44
Q

Neoprene is chemically known as

A

Polychlorepene

45
Q

Molecular weights of polymers are in the
range of

A

10^2

to 10^7

46
Q

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

A

allowable gas and liquid

velocities.

47
Q

Vertical vessels are not supported by

A

saddles

48
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. 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.

49
Q

Rivets are generally specified by the

A

shank diameter

50
Q

Oleum produces fumes of

A

SO3

51
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
.

A. none of these.

A

A. SO3 and 80 kg of H2SO4

52
Q

Inversion of sucrose produces

A

glucose

53
Q

Linde process of gas liquefaction employs

A

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

54
Q

The major use of butadiene is

A

in the manufacture of

synthetic rubber.

55
Q

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

A

trickle bed reactor

56
Q

__________ glass is used for the
manufacture of optical glass.

A

flint

57
Q

Favorable conditions for the liquefaction of
gases in general are

A

high pressure & low

temperature.

58
Q

Which of the following is an yellow pigment ?
A. Titanium dioxide C. Ferrous sulphate
B. Lead chromates D. Zinc sulfides

A

C. Ferrous sulphate

59
Q

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

A

freeze drying

60
Q

Sulphuric acid is mainly used in the
__________ industry.

A

fertilizer

61
Q

Main use of hydrazine is

A

rocket fuel

62
Q

Main use of liquid nitrogen is in

A

refrigerative cooling.

63
Q

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

A

vinyl chloride

64
Q

Yellow glycerine is made into white, using

A

activated carbon

65
Q

Gypsum is chemically

A

calcium sulfate

66
Q

Zeigler process

A

produces high density

polyethylene.

67
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).

68
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.

69
Q

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

A

unstable

70
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

71
Q

Flapper nozzle is used in a/an
__________ controller.

A

pneumatic

72
Q

Working principle of radiation
pyrometer is based on the

A

Stefan-Boltzman law

73
Q

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

A

Thomson effect

74
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.

75
Q

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

A

60Deg

76
Q

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

A

approximate

77
Q

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

A

hold baffle in space.

78
Q

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

A

Euler

79
Q

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

A

Mach

80
Q

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

A

jet pump

81
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.

82
Q

Most commonly used joint in
the underground pipe lines
is the

A

sleevejoint

83
Q

Water hammer in a pipeline
results from the

A

rapid pressure change due to

a rapid change in the rate of flow.

84
Q

Maxwell’s thermodynamic relations
applies to the

A

chemical systems in

equilibrium.

85
Q

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

A

B. CMC

86
Q

Foot valves provided in pumps
are __________ valves.

A

directional control

87
Q

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

A

steel

88
Q

__________ addition increases
the depth of hardness of steel.

A

chromium

Che (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions