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. The conditioned air supplied to the room must have the capacity to take up
Options- A. room sensible heat load only
- B. room latent heat load only
- C. both room sensible heat and latent heat loads
- D. none of the above Discuss
- 2. The alignment circle is marked on the psychrometric chart at
Options- A. 20°C DBT and 50% RH
- B. 26°C DBT and 50% RH
- C. 20°C DBT and 60% RH
- D. 26°C DBT and 60% RH Discuss
- 3. The thermal diffusivity for gases is generally __________ those for liquids.
Options- A. equal to
- B. less than
- C. greater than Discuss
- 4. A stripper-plate machine is used to draw the pattern from the mould.
Options- A. Yes
- B. No Discuss
- 5. Steam turbines are used for
Options- A. large marine propulsion
- B. electric power generation
- C. direct drive of fans, compressors, pumps
- D. all of these Discuss
- 6. Two shafts 'A' and 'B' are made of same material. The shaft 'A' is of diameter D and shaft 'B' is of diameter D/2. The strength of shaft 'B' is __________ as that of shaft 'A'
Options- A. one-eighth
- B. one-fourth
- C. one-half
- D. four times Discuss
- 7. The shear force at apoint on a beam is the algebraic __________ of all the forces on either side of the point.
Options- A. sum
- B. difference Discuss
- 8. Shear modulus is the ratio of
Options- A. linear stress to linear strain
- B. linear stress to lateral strain
- C. volumetric strain to linear strain
- D. shear stress to shear strain Discuss
- 9. The presence of hydrogen in steel causes
Options- A. reduced neutron absorption cross-section
- B. improved weldability
- C. embrittlement
- D. corrosion resistance Discuss
- 10. The brake pedal during ABS operation
Options- A. is pushed upward forcefully
- B. pedal stroke becomes longer
- C. transmits slight kickback to the driver's foot
- D. all of the above Discuss
More questions
Correct Answer: both room sensible heat and latent heat loads
Correct Answer: 26°C DBT and 50% RH
Correct Answer: greater than
Correct Answer: Yes
Correct Answer: all of these
Correct Answer: one-eighth
Correct Answer: sum
Correct Answer: shear stress to shear strain
Correct Answer: embrittlement
Correct Answer: transmits slight kickback to the driver's foot
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