Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
Options- A. parallel flow
- B. counter flow
- C. cross flow
- D. all of these
- Correct Answer
- all of these
- 1. Thermal conductivity of air increases with rise in temperature.
Options- A. Correct
- B. Incorrect Discuss
- 2. The emissivity for a black body is
Options- A. 0
- B. 0.5
- C. 0.75
- D. 1 Discuss
- 3. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be
Options- A. 1 kW
- B. 2 kW
- C. 3 kW
- D. 4 kW Discuss
- 4. Sulphur dioxide is extremely toxic and non-flammable.
Options- A. True
- B. False Discuss
- 5. Conduction is a process of heat transfer
Options- A. from one particle of the body to another without the actual motion of the particles
- B. from one particle of the body to another by the actual motion of the heated particles.
- C. from a hot body to a cold body, in a straight line, without affecting the intervening medium
- D. none of the above Discuss
- 6. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.
Options- A. Correct
- B. Incorrect Discuss
- 7. Thermal diffusivity of a substance is
Options- A. directly proportional to the thermal conductivity
- B. inversely proportional to density of substance
- C. inversely proportional to specific heat
- D. all of the above Discuss
- 8. Fouling factor is used
Options- A. in heat exchanger design as a safety factor
- B. in case of Newtonian fluids
- C. when a liquid exchanges heat with a gas
- D. none of the above Discuss
- 9. Which of the following refrigerant has the lowest freezing point?
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
- 10. The critical pressure of a liquid is the pressure
Options- A. above which a liquid will remain a liquid
- B. above which a liquid will explode
- C. above which a liquid will always convert into a vapour
- D. below which a liquid will always be in vapour form Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Correct
Correct Answer: 1
Correct Answer: 4 kW
Correct Answer: True
Correct Answer: from one particle of the body to another without the actual motion of the particles
Correct Answer: Correct
Correct Answer: all of the above
Correct Answer: in heat exchanger design as a safety factor
Correct Answer: R-22
Correct Answer: above which a liquid will remain a liquid
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