Process Equipment and Plant Design problems
- 1. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.
Options- A. increase by 1.8
- B. decrease by 22
- C. increase by 21.6
- D. none of these Discuss
Correct Answer: increase by 21.6
- 2. In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
Options- A. 2.5
- B. 5
- C. 12.5
- D. 17.5 Discuss
Correct Answer: 5
- 3. Bubble cap plate column is
Options- A. a finite stage contactor.
- B. used only for distillation, not for absorption.
- C. a differential stage contactor.
- D. a continuous contactor. Discuss
Correct Answer: a finite stage contactor.
- 4. In case of 1.5" heat exchanger tubes, the inside flow area __________ with decrease in BWG.
Options- A. increases
- B. decreases
- C. remains same
- D. none of these Discuss
Correct Answer: decreases
- 5. For turbine agitator, the impeller diameter is about
Options- A. 0.3 to 0.5 d
- B. 0.1 to 0.2 d
- C. 0.65 to 0.85 d
- D. 0.95 d Discuss
Correct Answer: 0.3 to 0.5 d
- 6. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?
Options- A. Triangular pitch.
- B. Square pitch.
- C. Diagonal square pitch.
- D. Heat transfer rate is independent of tube arrangement. Discuss
Correct Answer: Triangular pitch.
- 7. Cylindrical pressure vessels in horizontal condition is generally supported on a __________ support.
Options- A. lug
- B. skirt
- C. saddle
- D. guy wire Discuss
Correct Answer: saddle
- 8. Pick out the wrong statement.
Options- A. Rivetting provides a permanent fastening method.
- B. The joint made by overlapping of one plate over the other, and then rivetting the two plates together with two rows of rivets is called 'double rivetted butt joint'.
- C. Shank diameter of the rivets should be less than the size of the hole drilled in the plate for rivetting.
- D. The efficiency of a rivetted joint is the ratio of the strength of the rivetted joint to the strength of the solid plate. Discuss
Correct Answer: The joint made by overlapping of one plate over the other, and then rivetting the two plates together with two rows of rivets is called 'double rivetted butt joint'.
- 9. In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
Options- A. 45
- B. 60
- C. 80
- D. 95 Discuss
Correct Answer: 80
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