Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by
Options- A. (C.O.P.)P = (C.O.P.)R + 2
- B. (C.O.P.)P = (C.O.P.)R + 1
- C. (C.O.P)P = (C.O.P)R - 1
- D. (C.O.P)P = (C.O.P)R
- Correct Answer
- (C.O.P.)P = (C.O.P.)R + 1
- 1. Glazing in grinding wheels __________ cutting capacity.
Options- A. has no effect on
- B. increase
- C. decrease Discuss
- 2. The fire tubes in a Cochran boiler usually have __________ diameter.
Options- A. 6.25 mm
- B. 62.5 mm
- C. 72.5 mm
- D. 92.5 mm Discuss
- 3. The entropy is a point function and thus it is a property of the same.
Options- A. Correct
- B. Incorrect Discuss
- 4. Thermal diffusivity is a
Options- A. function of temperature
- B. physical property of a substance
- C. dimensionless parameter
- D. all of these Discuss
- 5. The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is
Options- A. 50mm
- B. 75mm
- C. 87.5mm
- D. 125mm Discuss
- 6. Holes are machined by push broaches only for sizing.
Options- A. Correct
- B. Incorrect Discuss
- 7. A file removes the metal during
Options- A. forward stroke
- B. return stroke
- C. both forward and return strokes
- D. none of these Discuss
- 8. The coefficient of discharge is the ratio of dieoretical discharge to the actual discharge through an orifice.
Options- A. True
- B. False Discuss
- 9. Two equal and opposite parallel forces whose lines of action are different form a couple.
Options- A. Correct
- B. Incorrect Discuss
- 10. Throttle governing of steam engines is a method of controlling the engine output by varying
Options- A. volume of intake steam
- B. pressure of intake steam
- C. temperature of intake steam
- D. all of these Discuss
More questions
Correct Answer: decrease
Correct Answer: 62.5 mm
Correct Answer: Correct
Correct Answer: physical property of a substance
Correct Answer: 87.5mm
Correct Answer: Correct
Correct Answer: forward stroke
Correct Answer: False
Correct Answer: Correct
Correct Answer: pressure of intake steam
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