Discussion
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- Question
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
Options- A. 5-10
- B. 15-20
- C. 30-35
- D. 35-40
- Correct Answer
- 15-20
- 1. For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.
Options- A. sieve
- B. valve
- C. counterflow
- D. bubble cap Discuss
- 2. The necessary wall thickness for a metallic storage vessel is a function of the
Options- A. ultimate tensile strength (or yield point) of the material and operating temperature.
- B. operating pressure and welding/joint efficiency.
- C. diameter of the vessel.
- D. all (a); (b) and (c). Discuss
- 3. Bubble cap tray is the most commonly used tray in large distillation column, because
Options- A. of its flexibility and nearly constant efficiency under varying conditions of operation.
- B. it incurs less pressure drop as compared to any other try designed for the same duty.
- C. it eliminates the foaming and entrain-ment tendency during operation.
- D. none of these. Discuss
- 4. In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
Options- A. less than
- B. 1.25-1.50 times
- C. 2.5 times
- D. one-fourth of Discuss
- 5. Movement of pipeline caused by thermal expansion is taken care by providing
Options- A. expansion joint.
- B. changes in its direction.
- C. change in the shape of pipeline.
- D. all (a), (b) and (c). Discuss
- 6. Pick out the wrong statement
Options- A. In a flanged and standard dished head, the crown radius is ? shell outside diameter.
- B. In a flanged and shallow dished head, the crown radius is > shell outside diameter.
- C. Flat head covers are most suitable for larger vessels operating at very high pressure.
- D. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses. Discuss
- 7. In a bag filter, the pressure drop increases directly as the
Options- A. density of the gas, but is independent of the viscosity of the gas.
- B. density of the gas and inversely as viscosity of the gas.
- C. viscosity of the gas and inversely as density of the gas.
- D. none of these. Discuss
- 8. In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.
Options- A. 1.3 to 2
- B. 1.6 to 2
- C. 2.5
- D. 1.5 to 3 Discuss
- 9. In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement
Options- A. results in higher shell side pressure drop.
- B. can accomodate less number of tubes for a given shell diameter.
- C. facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid.
- D. creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient. Discuss
- 10. Which of the following is the best tube material from thermal conductivity point of view alone?
Options- A. Aluminium
- B. Stainless steel
- C. Copper
- D. Carbon steel Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: bubble cap
Correct Answer: all (a); (b) and (c).
Correct Answer: of its flexibility and nearly constant efficiency under varying conditions of operation.
Correct Answer: 1.25-1.50 times
Correct Answer: all (a), (b) and (c).
Correct Answer: Flat head covers are most suitable for larger vessels operating at very high pressure.
Correct Answer: density of the gas and inversely as viscosity of the gas.
Correct Answer: 1.3 to 2
Correct Answer: results in higher shell side pressure drop.
Correct Answer: Copper
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