Process Equipment and Plant Design problems
- 1. In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)
Options- A.
- B. D2 - D1
- C.
- D. none of these Discuss
Correct Answer:
- 2. Excessive liquid gradient on a tray may result in the
Options- A. maldistribution of gas.
- B. back trapping.
- C. gas blowing beneath cap skit.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 3. In a cylinderical vessel subjected to internal pressure, the longitudinal stress ?L and the circumferential stress, ?n are related by
Options- A. ?h = 2 ?L
- B. ?h = ?L
- C. ?h = ?L/2
- D. no relation exists Discuss
Correct Answer: ?h = 2 ?L
- 4. Rotary driers are most economically designed for the number of heat transfer units (HTU) from
Options- A. 0.01 to 1
- B. 1.5 to 2.5
- C. 5 to 10
- D. 10 to 20 Discuss
Correct Answer: 1.5 to 2.5
- 5. Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to
Options- A. hG = 1.004G0.37
- B. 1.004G0.8
- C. hG = 0.0176G0.37
- D. 0.0176G1.37 Discuss
Correct Answer: hG = 1.004G0.37
- 6. __________ liquor is best handled in a long tube vertical evaporator.
Options- A. Foamy
- B. Scaling
- C. Viscous
- D. Salting Discuss
Correct Answer: Foamy
- 7. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.
Options- A. 1.5 to 2
- B. 3 to 4
- C. 4 to 5
- D. >5 Discuss
Correct Answer: 1.5 to 2
- 8. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to
Options- A. 5 cms
- B. 40% of the I.D. of the shell
- C. 25 cms
- D. I.D. of the shell Discuss
Correct Answer: 5 cms
- 9. The units of Young's modulus of elasticity and __________ are the same.
Options- A. strain
- B. stress
- C. modular ratio
- D. none of these Discuss
Correct Answer: stress
- 10. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
Options- A. 2 to 3
- B. 3 to 5
- C. 4 to 8
- D. 6 to 12 Discuss
Correct Answer: 4 to 8
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