adkasdas

Question 1

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

Answer 1

Rimmed Steel

Question 2

25 per cent cut segmental baffle means that
the baffle

Answer 2

Height is 75% of the ID of the

shell

Question 3

Liquid/petroleum fuel storage tanks are built
underground (as in case of petrol pumps),
when the storage capacity is less than
__________ kilolitres.

Answer 3

45

Question 4

Le/D for fully open globe value may be around

Answer 4

300

Question 5

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

Answer 5

2.5 to 5

Question 6

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.

Answer 6

5-11

Question 7

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

Answer 7

10

Question 8

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.

Answer 8

8

Question 9

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

Answer 9

layout and pitch

Question 10

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

Answer 10

0.8

Question 11

Triangular pitch tube layout as compared to
square pitch in a shell and tube heat
exchanger

Answer 11

permits the use of more tubes

in a given shell diameter

Question 12

Bracket supports are the most suitable for
supporting __________ vessels.

Answer 12

thick walled vertical

Question 13

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

Answer 13

outside diameter

Question 14

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.

Answer 14

20

Question 15

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

Answer 15

less

Question 16

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

Answer 16

Cross flow

Question 17

The main purpose of providing stepping on the
trays is to

Answer 17

facilitate handling of large flow

rate of liquid

Question 18

Needle valves are generally not used for

Answer 18

very large diameter pipes

Question 19

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

Answer 19

time lag

Question 20

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

Answer 20

frequency

Question 21

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

Answer 21

chemical properties

Question 22

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

Answer 22

centrifugal extractor

Question 23

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

Answer 23

B. number of plates

Question 24

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.

Answer 24

A. relative volatility is reasonably constant.

Question 25

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

Answer 25

natural

Question 26

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.

Answer 26

C. Allowable vapor velocity.

Question 27

Saddle supports are used for supporting __________ vessels.

Answer 27

Horizontal Cylindrical

Question 28

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

Answer 28

D. none of these.

Question 29

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

Answer 29

B. Nitric acid

Question 30

Kaoline is a/an

Answer 30

refractory material

Question 31

Phenol is mainly used

Answer 31

to produce phenol formaldehyde

Question 32

Main constituent of dolomite is

Answer 32

MgCO3

Question 33

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

Answer 33

shift conversion

Question 34

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

Answer 34

oxidizing

Question 35

Portland cement consists mainly of

Answer 35

CaO and SiO2

Question 36

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

Answer 36

Pyrex

Question 37

Mannheim furnace is used in the manufacture of

Answer 37

hydrochloric acid

Question 38

Thermosetting materials

Answer 38

are cross-linked molecules.

Question 39

__________ iron is the purest form of iron.

Answer 39

Wrought

Question 40

Enamels

Answer 40

give good glossy finish.

Question 41

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.

Answer 41

A. evaporation and burning the concentrate followed by causticisation of products.

Question 42

Varnish does not contain

Answer 42

pigment

Question 43

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

Answer 43

Packed Column

Question 44

Neoprene is chemically known as

Answer 44

Polychlorepene

Question 45

Molecular weights of polymers are in the range of

Answer 45

10^2 to 10^7

Question 46

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

Answer 46

allowable gas and liquid velocities.

Question 47

Vertical vessels are not supported by

Answer 47

saddles

Question 48

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.

Answer 48

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.

Question 49

Rivets are generally specified by the

Answer 49

shank diameter

Question 50

Oleum produces fumes of

Answer 50

SO3

Question 51

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.

Answer 51

A. SO3 and 80 kg of H2SO4

Question 52

Inversion of sucrose produces

Answer 52

glucose

Question 53

Linde process of gas liquefaction employs

Answer 53

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

Question 54

The major use of butadiene is

Answer 54

in the manufacture of synthetic rubber.

Question 55

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

Answer 55

trickle bed reactor

Question 56

__________ glass is used for the manufacture of optical glass.

Answer 56

flint

Question 57

Favorable conditions for the liquefaction of gases in general are

Answer 57

high pressure & low temperature.

Question 58

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

Answer 58

C. Ferrous sulphate

Question 59

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

Answer 59

freeze drying

Question 60

Sulphuric acid is mainly used in the __________ industry.

Answer 60

fertilizer

Question 61

Main use of hydrazine is

Answer 61

rocket fuel

Question 62

Main use of liquid nitrogen is in

Answer 62

refrigerative cooling.

Question 63

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

Answer 63

vinyl chloride

Question 64

Yellow glycerine is made into white, using

Answer 64

activated carbon

Question 65

Gypsum is chemically

Answer 65

calcium sulfate

Question 66

Zeigler process

Answer 66

produces high density polyethylene.

Question 67

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).

Answer 67

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

Question 68

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.

Answer 68

B. CO2 is the strongest paramagnetic gas.

Question 69

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

Answer 69

unstable

Question 70

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

Answer 70

solid semi-conductor

Question 71

Flapper nozzle is used in a/an __________ controller.

Answer 71

pneumatic

Question 72

Working principle of radiation pyrometer is based on the

Answer 72

Stefan-Boltzman law

Question 73

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

Answer 73

Thomson effect

Question 74

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

Answer 74

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

Question 75

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

Answer 75

60Deg

Question 76

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

Answer 76

approximate

Question 77

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

Answer 77

hold baffle in space.

Question 78

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

Answer 78

Euler

Question 79

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

Answer 79

Mach

Question 80

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

Answer 80

jet pump

Question 81

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

Answer 81

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

Question 82

Most commonly used joint in the underground pipe lines is the

Answer 82

sleevejoint

Question 83

Water hammer in a pipeline results from the

Answer 83

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

Question 84

Maxwell's thermodynamic relations applies to the

Answer 84

chemical systems in equilibrium.

Question 85

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

Answer 85

B. CMC

Question 86

Foot valves provided in pumps are __________ valves.

Answer 86

directional control

Question 87

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

Answer 87

steel

Question 88

__________ addition increases the depth of hardness of steel.

Answer 88

chromium