Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The rato of energy transferred by convection to that by conduction is called
Options- A. Stanton number
- B. Nusselt number
- C. Biot number
- D. Peclet number Discuss
Correct Answer: Nusselt number
- 2. Upto the critical radius of insulation,
Options- A. added insulation will increase heat loss
- B. added insulation will decrease heat loss
- C. convective heat loss will be less than conductive heat loss
- D. heat flux will decrease Discuss
Correct Answer: added insulation will increase heat loss
- 3. The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. Pressure of water vapour is given by
Options- A.
- B.
- C.
- D. none of these Discuss
Correct Answer: none of these
- 5. In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.
Options- A. same
- B. less
- C. greater Discuss
Correct Answer: greater
- 6. For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.
Options- A. increases
- B. decreases Discuss
Correct Answer: decreases
- 7. The drier in a refrigeration system removes moisture in the system.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 8. Wet bulb temperature indicates the moisture content in air.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 9. A vapour absorption refrigeration system
Options- A. gives noisy operation
- B. gives quiet operation
- C. requires little power consumption
- D. cools below 0° C Discuss
Correct Answer: gives quiet operation
- 10. The relative humidity lines on a psychrometric chart are
Options- A. vertical and uniformly spaced
- B. horizontal and uniformly spaced
- C. horizontal and non-uniformly spaced
- D. curved lines Discuss
Correct Answer: curved lines
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