Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The power per tonne of refrigeration is
Options- A. 3.5/C.O.P.
- B. C.O.P/3.5
- C. 3.5 x C.O.P.
- D. none of these
- Correct Answer
- 3.5/C.O.P.
- 1. The pressure at the inlet of a refrigerant compressor is called
Options- A. suction pressure
- B. discharge pressure
- C. critical pressure
- D. back pressure Discuss
- 2. In aircraft, air refrigeration Cycle is used because of
Options- A. low weight per tonne of refrigeration
- B. high heat transfer rate
- C. low temperature at high altitudes
- D. higher coefficient of performance Discuss
- 3. A refrigerant compressor is used to
Options- A. raise the pressure of the refrigerant
- B. raise the temperature of the refrigerant
- C. circulate the refrigerant through the refrigerating system
- D. all of the above Discuss
- 4. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
Options- A. liquid pump
- B. generator
- C. absorber and generator
- D. absorber, generator and liquid pump Discuss
- 5. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is
Options- A. ammonia
- B. carbon dioxide
- C. sulphur dioxide
- D. R-12 Discuss
- 6. The angle on which the strength of the tool depends is
Options- A. rake angle
- B. cutting angle
- C. clearance angle
- D. lip angle Discuss
- 7. In centreless grinding, the surface speed of regulating wheel is
Options- A. 5 to 15 m/min
- B. 15 to 60 m/min
- C. 60 to 90 m/min
- D. 90 to 120 m/min Discuss
- 8. Which of the following statement is correct regarding grinding of high carbon steel?
Options- A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
- B. Aluminium oxide wheels are employed.
- C. The grinding wheel has to be of open structure.
- D. all of the above Discuss
- 9. In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
Options- A. high metal removal rate
- B. dry machining
- C. use of soft cutting tool
- D. surface finish Discuss
- 10. While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is
Options- A. independent of index change gear ratio
- B. dependent on speed change gear ratio
- C. inter-related to index change gear ratio
- D. independent of speed and index change gear ratio Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: suction pressure
Correct Answer: low weight per tonne of refrigeration
Correct Answer: all of the above
Correct Answer: absorber, generator and liquid pump
Correct Answer: sulphur dioxide
Correct Answer: rake angle
Correct Answer: 15 to 60 m/min
Correct Answer: all of the above
Correct Answer: surface finish
Correct Answer: inter-related to index change gear ratio
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