Equipment and Plant Design (ED/PD)

Question 1

The ratio of shear stress to shear strain is called

Answer 1

Shear modulus

Question 2

A material that is seldom used for pressure vessel construction

Answer 2

Rimmed steel

Question 3

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

Answer 3

Sea green

Question 4

25% cut segmental baffle means that the baffle

Answer 4

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

Question 5

Liquid/petroleum fuel storage tanks are built underground, when the storage capacity is less than ____ kiloliters.

Answer 5

45

Question 6

Le/D for fully open globe valve may be around

Answer 6

300

Question 7

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
D. A,b,c

Answer 7

D. A,b,c

Question 8

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

Answer 8

Increases

Question 9

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

Answer 9

2.5 to 5

Question 10

In cae of a shell and tube heat exchanger, the min. shell thickness for carbon steel depends on shell diameter abd is in the range of ____ mm.

Answer 10

5-11

Question 11

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

Answer 11

Elastic limit

Question 12

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

Answer 12

C. Shortest centre to centre distance between adjacent tubes

Question 13

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

A. Sensible heat changes for vapor and liquid are negligibly small
B. Reflux is not a saturated liquid
C. Molar latent heat of the two components are equal
D. None of these

Answer 13

B. Reflux is not a saturated liquid

Question 14

The value of fouling factor depends upon the

A. Characteristics of process fluid
B. Velocity of process fluid containing suspended solids
C. Suspended solids in the fluid
D. A, b, c

Answer 14

D. A, b, c

Question 15

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

Answer 15

10

Question 16

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 and number of tubes and operated at the same liquid flow rate.

Answer 16

8

Question 17

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

Answer 17

(1.2)^5/3

Question 18

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

A. Layout
B. Pitch
C. Both a and b
D. Neither a and b

Answer 18

C. Both a and b

Question 19

It is where the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure

Answer 19

At the inner surface

Question 20

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

Answer 20

0.80

Question 21

A rivetted joint does not fail by ____ of rivets

Answer 21

0.55

Question 22

Triangular pitch tube layout as compared to the 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

Answer 22

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

Question 23

Bracket supports are the most suitable for supporting ______ vessels

Answer 23

Thick-walled vertical

Question 24

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

Answer 24

D. None of these

Question 25

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

Answer 25

Inside diameter

Question 26

Lessing ring is formed by the addition of the partition across the centre of a raschig ring, which results in an area increase of about _____ percent

Answer 26

20

Question 27

In chemical process equipment, the conical bottom heads used, usually has an apex angle of

Answer 27

60°

Question 28

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

Answer 28

75

Question 29

Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of

Answer 29

Ultimate stress to working stress

Question 30

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.

Answer 30

20-40

Question 31

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 cross-sectional area C. Pressure drop is less compared is similar bubble cap towers D. All a,b,c

Answer 31

D. All a,b,c

Question 32

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

Answer 32

Ellipsoidal

Question 33

Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

Answer 33

Less

Question 34

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 soace between the bundle and the shell

Answer 34

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

Question 35

Speed of the drum of the rotary vacuum filter normally ranges from____ rpm

Answer 35

0.1 to 2

Question 36

A stuffing box is used for

Answer 36

Prevention of fluid leakage around moving parts