Discussion
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- Question
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
- Correct Answer
- Copper
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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 Discuss
- 6. Ratio of tube length to shell diameter for a shell and tube heat exchanger is
Options- A. 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers.
- B. 4 : 1 to 8 : 1 for liquid-liquid exchanger.
- C. < 4 : 1 for gas-gas exchangers.
- D. both(b) & (c). Discuss
- 7. For a given fluid, as the pipe diameter increases, the pumping cost
Options- A. decreases.
- B. increases.
- C. remains unaffected.
- D. may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion. Discuss
- 8. Hole diameter of the seive trays in the distillation column ranges from __________ mm.
Options- A. lto3
- B. 4 to 8
- C. 3 to 12.5
- D. 12.5 to 18.5 Discuss
- 9. Value of Peclet number = ?, is the representative of
Options- A. laminar flow.
- B. complete back mixing,
- C. plug flow.
- D. eddy diffusivity = 0. Discuss
- 10. In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ? = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier cross-section H = hold up of solid.)
Options- A.
- B.
- C.
- D.
Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: results in higher shell side pressure drop.
Correct Answer: 1.3 to 2
Correct Answer: density of the gas and inversely as viscosity of the gas.
Correct Answer: Flat head covers are most suitable for larger vessels operating at very high pressure.
Correct Answer: 15-20
Correct Answer: both(b) & (c).
Correct Answer: decreases.
Correct Answer: 3 to 12.5
Correct Answer: plug flow.
Correct Answer:
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