Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.
Options- A. increases
- B. decreases
- Correct Answer
- decreases
- 1. 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
- 2. Pressure of water vapour is given by
Options- A.
- B.
- C.
- D. none of these Discuss
- 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
- 4. 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
- 5. 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
- 6. The drier in a refrigeration system removes moisture in the system.
Options- A. Correct
- B. Incorrect Discuss
- 7. Wet bulb temperature indicates the moisture content in air.
Options- A. Agree
- B. Disagree Discuss
- 8. 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
- 9. 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
- 10. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is
Options- A. 20°C
- B. 40°C
- C. 60°C
- D. 66.7°C Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: greater
Correct Answer: none of these
Correct Answer: True
Correct Answer: added insulation will increase heat loss
Correct Answer: Nusselt number
Correct Answer: Correct
Correct Answer: Agree
Correct Answer: gives quiet operation
Correct Answer: curved lines
Correct Answer: 20°C
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