Process Equipment and Plant Design MCQs

Question 1

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.

Accepted Answer

8

Answer

2

Answer

$$\frac{1}{2}$$

Answer

4

Question 2

Optimum economic pipe diameter for fluid flow is determined by the

Accepted Answer

Total cost considerations (pumping cost plus fixed cost of the pipe)

Answer

Viscosity of the fluid

Answer

Density of the fluid

Answer

None of these

Question 3

Baffle spacing is generally __________ the I.D. of the shell.

Accepted Answer

Both B and C

Answer

More than

Answer

Not greater than

Answer

Not less than one fifth of

Question 4

Which of the following lengths of heat exchanger tubes are normally not used in practice?

Accepted Answer

10 metres

Answer

2.5 metres

Answer

6 metres

Answer

0.5 metre

Question 5

Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Accepted Answer

Both B & C

Answer

Plain carbon steel and cast iron parts are used

Answer

Wall thickness is > 30 mm

Answer

Material of construction is high alloy steel

Question 6

Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

Accepted Answer

Less

Answer

More

Answer

Same

Answer

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

Question 7

Value of Peclet number = 0, is the representative of

Accepted Answer

Complete back mixing

Answer

Laminar flow

Answer

Plug flow

Answer

Eddy diffusivity = 0

Question 8

In a cylinderical vessel subjected to internal pressure, the longitudinal stress $${\sigma _{	ext{L}}}$$ and the circumferential stress, $${\sigma _{	ext{h}}}$$ are related by

Accepted Answer

$${\sigma _{	ext{h}}} = 2{\sigma _{	ext{L}}}$$

Answer

$${\sigma _{	ext{h}}} = {\sigma _{	ext{L}}}$$

Answer

$${\sigma _{	ext{h}}} = \frac{{{\sigma _{	ext{L}}}}}{2}$$

Answer

No relation exists

Question 9

Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to

Accepted Answer

G 0.8

Answer

G 0.2

Answer

G 0.5

Answer

G 1.5