Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The thermostatic expansion valve is also called
Options- A. constant pressure valve
- B. constant temperature valve
- C. constant superheat valve
- D. none of these
- Correct Answer
- constant superheat valve
- 1. In a lithium bromide absorption refrigeration system
Options- A. lithium bromide is used as a refrigerant and water as an absorbent
- B. water is used as a refrigerant and lithium bromide as an absorbent
- C. ammonia is used as a refrigerant and lithium bromide as an absorbent
- D. none of the above Discuss
- 2. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
Options- A. Agree
- B. Disagree Discuss
- 3. The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called
Options- A. First law of thermodynamics
- B. Newton's law of cooling
- C. Newton's law of heating
- D. Stefan's law Discuss
- 4. It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be
Options- A. dehumidification
- B. cooling and humidification
- C. cooling and dehumidification
- D. dehumidification and pure sensible cooling Discuss
- 5. The boiling point of R-12 is about - 30°C.
Options- A. True
- B. False Discuss
- 6. During sensible heating of air __________ decreases.
Options- A. wet bulb temperature
- B. relative humidity
- C. dry bulb temperature
- D. specific humidity Discuss
- 7. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
Options- A. conduction
- B. free convection
- C. forced convection
- D. radiation Discuss
- 8. The material of pipe lines for a system using freon as a refrigerant should be
Options- A. brass
- B. copper
- C. steel
- D. aluminium Discuss
- 9. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
Options- A. the better insulation must be put inside
- B. the better insulation must be put outside
- C. one could place either insulation on either side
- D. one should take into account the steam temperature before deciding as to which insulation is put where Discuss
- 10. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
Options- A. conduction
- B. convection
- C. radiation Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: water is used as a refrigerant and lithium bromide as an absorbent
Correct Answer: Agree
Correct Answer: Newton's law of cooling
Correct Answer: cooling and dehumidification
Correct Answer: True
Correct Answer: relative humidity
Correct Answer: free convection
Correct Answer: copper
Correct Answer: the better insulation must be put inside
Correct Answer: convection
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