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CPI, PC, PD > Plant Design > Flashcards

Plant Design Flashcards

1
Q

The ratio of shear stress to shear strain is called

A. bulk modulus
B. shear modulus
C. modulus of rigidity
D. modulus of elasticity

A

B. shear modulus

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2
Q

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

A. Rimmed still
B. Mild steel
C. Killed steel
D. Semi killed steel

A

Rimmed still

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3
Q

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

A. sea green
B. brown
C. yellow
D. red

A

sea green

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4
Q

25% cut segmental baffle means that the baffle

A. height is 75% of the I.D. of the shell.
B. height is 25% of the I.D. of the shell.
C. spacing is 75% of its height.
D. width is 25% of its height.

A

height is 75% of the I.D. of the shell.

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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. 20
B. 30
C. 45
D. 85

A

45

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6
Q

Le/D for fully open globe value may be around

A. 10
B. 25
C. 75
D. 300

A

300

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7
Q

Lug support is
A. the most suitable for thick vertical vessel.
B. same as bracket support.
C. provided usually for vessels of much smaller height than skirt supported vessels.

A

ALL

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8
Q

With increase in the number of shells passes, the value of F T

A. increases
B. decreases
C. remains same
D.remains same, only if the number of tube passes does
not change

A

INCREASES

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9
Q

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

A. 1.5 to 2
B. 2.5 to 5
C. 5 to 10
D. 10 to 15

A

2.5 to 5

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10
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. 3-5
B. 5-11
C. 8-15
D. 12-18

A

5-11

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11
Q

The stress developed in a material without any permanent set is
called the

A. ultimate stress
B. yield stress
C. elastic limit
D. breaking stress

A

elastic limit

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12
Q

In a shell and tube heat exchanger, the ‘tube pitch’ is defined as
the

A. O.D. of the tube for square pitch.
B. shortest distance between two adjacent tube holes.
C. shortest centre to centre distance between adjacent tubes.
D. none of these.

A

C. shortest centre to centre distance between adjacent tubes.

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13
Q

Which
of the following is not a valid assumption in continuous
binary distillation for calculating the number of equilibrium stages
by Mc Cabe Thiele’s method

A. Sensible heat changes for vapor & liquid are negligibly small.
B. Reflux is not a saturated liquid.
C. Molar latent heat of the two components are equal.
D. Heat of mixing of normal liquid is assumed to be zero

A

Reflux is not a saturated liquid.

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14
Q

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

A. 10
B. 20
C. 30
D. 40

A

10

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15
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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16
Q

To keep the power input constant for a stirred vessel operating
under fully developed turbulent flow conditions (constant power
number), if the impeller diameter is increased by 20 the
impeller speed should be decreased by a factor of

A

(1.2)^5/3

17
Q

The value of fouling factor depends upon the
A. characteristic of process fluid.
B. velocity of process fluid containing suspended solids.
C. suspended solids in the fluid.
D. (a), (b) and (c).

A

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

18
Q

Where does the maximum tensile strength occur in a thick
cylindrical vessel subjected to internal pressure?
A. At the inner surface.
B. At the mid thickness of the cylindrical wall.
C. At the outer surface.
D. None of these.

A

A. At the inner surface.

19
Q

It is not desirable to design a heat exchanger for LMTD
correction factor, FT, of less than
A. 0.99
B. 0.95
C. 0.80
D. 0.55

A

C. 0.80

20
Q

Arivetted joint does not fail by of rivets.
A. 0.99
B. 0.95
C. 0.80
D. 0.55

A

D. 0.55

21
Q

Triangular pitch tube layout as compared to square pitch in a
shell and tube heat exchanger
A. permits the use of less tubes in a given shell diameter.
B.facilitates comparatively easier external cleaning because of
large clearance.
C. permits the use of more tubes in a given shell diameter.
D. both (b) and (c)

A

C. permits the use of more tubes in a given shell diameter

22
Q

Bracket supports are the most suitable for supporting
vessels.
A. thick walled vertical
B. horizontal
C. thin spherical (e.g. Horton sphere)
D. none of these

A

A. thick walled vertical

23
Q

In a multi-pass shell and tube heat exchanger, the shell side
cross flow area does not depend upon
A. baffle spacing
B. clearance
C. pitch
D. none of these

A

D. none of these

24
Q

Two iron pipes of the same nominal diameter but different
schedule numbers will have the same
A. inside diameter
B. outside diameter
C. wall thickness
D. none of these

A

A. inside diameter

25
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. 5
B. 20
C. 35
D. 55

A

20

26
Q

In chemical process equipment, the conical bottom heads used,
usually has an apex angle of
A. 20°
B. 40°
C. 60°
D. 80

A

C. 60°

27
Q

Smaller sized packings are generally dumped to the packed
columns, and the large ones of size greater than ____
mm are stacked individually, which provides better control over
bed porosity and offers lower gas pressure drop.
A. 25
B. 50
C. 75
D. 150

A

C. 75

28
Q

Correct use of ‘factor of safety’ is very important in equipment
design. It is defined as the ratio of the
A. ultimate stress to breaking stress.
B. ultimate stress to working stress.
C. working stress to ultimate stress.
D. none of these

A

B. ultimate stress to working stress

29
Q

The operating velocity in the absorption tower is usually 40-50%
of the flooding velocity. Packed absorption towers are normally
designed for a pressure drop of about ______ mm of water
column per meter height of packing.
A. 1-5
B. 20-40
C. 100-150
D. 1000-150

A

B. 20-40

30
Q

In perforated plate towers, the
A. hole sizes may be around 1/8” or 3/16”.
B.total hole area may be around 6 to 15% of tower crosssectional area.
C. pressure drop is less compared is similar bubble cap towers.
D. all (a), (b) and (c)

A

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

31
Q

The ends of a cylindrical vessel can be closed by a head, which
can be one of the four shapes. For the same thickness, choose
the one which can withstand the highest pressure.
A. Flat plate
B. Hemispherical
C. Torispherical
D. Ellipsoidal

A

D. Ellipsoidal

32
Q

Wall thickness of schedule 40 pipe as compared to that of
schedule 80 pipe is
A. more
B. less
C. same
D. either (a) or (b); depends upon the I.D. of the pipe

A

B. less

33
Q

Pick out the wrong statement pertaining to the design of a
basket type evaporator.
A. It is used for high viscosity liquor having large rate of scaling.
B. The tube bundle is suspended on bracket.
C. There is no central downtake.
D.Downtake is formed by the annular space between the bundle
and the shell

A

A. It is used for high viscosity liquor having large rate of scaling

34
Q

Speed of the drum of the rotary vacuum filter normally ranges from ___ rpm.
A. 0.1 to 2
B. 5 to 7
C. 3 to 8
D. 8 to 15

A

A. 0.1 to 2

35
Q

Astuffing box is used for
A.absorbing the contraction/expansion of pipeline due to
temperature changes.
B. prevention of fluid leakage around moving parts.
C. facilitating smooth opening and closing of a valve.
D. reducing the resistance of fluid flow

A

B. prevention of fluid leakage around moving parts.

36
Q

In a heat exchanger, shell side fluid velocity can be changed by
changing the tube
A. layout
B. pitch
C. both (a) & (b)
D. neither (a) nor (b

A

C. both (a) & (b)

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