Free Heat Transfer Operations MCQs with Answers
645 Heat Transfer Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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645 questions · page 33 of 33
- A. Transition
- B. Nucleate
- C. Film
- D. All modes of
Explanation: Fins are advantageous in film boiling because the vapour film creates high thermal resistance and gives a relatively low heat-transfer…
Correct answer: Film- A. 25
- B. 45
- C. 65
- D. 20
Explanation: Very inefficient or older steam boilers may have thermal efficiencies near 20%, although modern boilers are usually much more efficient.
Correct answer: 20- A. High heat capacity
- B. Both B. and C.
- C. High thermal conductivity
- D. Low heat capacity
Explanation: A cooking vessel should have high thermal conductivity so heat spreads quickly and uniformly, but low heat capacity so it does not require…
Correct answer: Both B. and C.- A. Bomb
- B. Junker's
- C. Throttling
- D. Boy's
Explanation: A throttling calorimeter determines steam dryness from the pressure and temperature after throttling, where the process is approximately…
Correct answer: Throttling- A. All 'A', 'B' & 'C'
- B. Wet bulb temperature=dew point temperature
- C. Saturation temperature=dew point temperature
- D. Wet bulb temperature=dry bulb temperature
Explanation: At 100% relative humidity, the air is saturated, so dry-bulb, wet-bulb and dew-point temperatures are all equal.
Correct answer: All 'A', 'B' & 'C'