Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.
Options- A. low
- B. high
- Correct Answer
- high
- 1. The shrinkage allowance for cast iron pattern is
Options- A. 10 mm/m
- B. 16 mm/m
- C. 20 mm/m
- D. 26 mm/m Discuss
- 2. The __________ point of ammonia is -77.7°C.
Options- A. freezing
- B. boiling Discuss
- 3. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.
Options- A. one-half
- B. one-third
- C. two-third Discuss
- 4. The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
Options- A. Yes
- B. No Discuss
- 5. In ideal machines, mechanical advantage is __________ velocity ratio.
Options- A. equal to
- B. less than
- C. greater than Discuss
- 6. Sulphur in cast iron
Options- A. makes the iron soft and easily machinable
- B. increases hardness and brittleness
- C. makes the iron white and hard
- D. aids fusibility and fluidity Discuss
- 7. The state of a substance whose evaporation from its liquid state is partial, is known as steam.
Options- A. Agree
- B. Disagree Discuss
- 8. The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.
Options- A. same
- B. less
- C. more Discuss
- 9. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
Options- A. True
- B. False Discuss
- 10. The speed of a turbine runner is
Options- A. directly proportional to H1/2
- B. inversely proportional to H1/2
- C. directly proportional to H3/2
- D. inversely proportional to H3/2 Discuss
More questions
Correct Answer: 10 mm/m
Correct Answer: freezing
Correct Answer: one-third
Correct Answer: No
Correct Answer: equal to
Correct Answer: increases hardness and brittleness
Correct Answer: Disagree
Correct Answer: less
Correct Answer: True
Correct Answer: directly proportional to H1/2
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