Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The rate of heat flow through a body is
. The term x/kA is known as
Options- A. thermal coefficient
- B. thermal resistance
- C. thermal conductivity
- D. none of these Discuss
Correct Answer: thermal resistance
- 2. Which of the following refrigerant has the lowest boiling point?
Options- A. Ammonia
- B. Carbon dioxide
- C. Sulphur dioxide
- D. R-12 Discuss
Correct Answer: Carbon dioxide
- 3. In a domestic vapour compression refrigerator, the refrigerant commonly used is
Options- A. CO2
- B. Ammonia
- C. R-12
- D. all of these Discuss
Correct Answer: R-12
- 4. The human body feels comfortable when the heat stored in the body is
Options- A. positive
- B. negative
- C. zero
- D. none of these Discuss
Correct Answer: zero
- 5. The freezing point of sulphur dioxide is
Options- A. -56.6°C
- B. -75.2°C
- C. -77.7°C
- D. -135.8°C Discuss
Correct Answer: -75.2°C
- 6. Oil separator in a refrigeration cycle is installed
Options- A. before compressor
- B. between compressor and condenser
- C. between condenser and evaporator
- D. between condenser and expansion valve Discuss
Correct Answer: between compressor and condenser
- 7. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is
Options- A. ammonia
- B. carbon dioxide
- C. sulphur dioxide
- D. R-12 Discuss
Correct Answer: ammonia
- 8. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
Options- A. move actually
- B. do not move actually
- C. affect the intervening medium
- D. does not affect the intervening medium Discuss
Correct Answer: do not move actually
- 9. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.
Options- A. same
- B. lower
- C. higher Discuss
Correct Answer: lower
- 10. Radiation is the process of heat transfer in which heat flows from a __________ , in a straight line, without affecting the intervening medium.
Options- A. cold body to hot body
- B. hot body to cold body
- C. smaller body to larger body
- D. larger body to smaller body Discuss
Correct Answer: hot body to cold body
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