Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The emissivity for a black body is
Options- A. 0
- B. 0.5
- C. 0.75
- D. 1
- Correct Answer
- 1
- 1. 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
- 2. Sulphur dioxide is extremely toxic and non-flammable.
Options- A. True
- B. False Discuss
- 3. 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
- 4. During humidification process, __________ increases.
Options- A. wet bulb temperature
- B. relative humidity
- C. dry bulb temperature
- D. specific humidity Discuss
- 5. Which of the following statement is correct for ammonia as a refrigerant?
Options- A. It is toxic to mucous membranes.
- B. it requires large displacement per TR compared to fluoro carbons.
- C. It reacts with copper and its alloys.
- D. all of these Discuss
- 6. Thermal conductivity of air increases with rise in temperature.
Options- A. Correct
- B. Incorrect Discuss
- 7. 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 Discuss
- 8. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.
Options- A. Correct
- B. Incorrect Discuss
- 9. 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
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
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: relative humidity
Correct Answer: all of these
Correct Answer: Correct
Correct Answer: all of these
Correct Answer: Correct
Correct Answer: all of the above
Correct Answer: in heat exchanger design as a safety factor
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