Heat Transfer, Refrigeration and Air Conditioning problems
- 1. During sensible cooling of air, specific humidity
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: remains constant
- 2. Thermal conductivity of solid metals __________ with rise in temperature.
Options- A. remains same
- B. decreases
- C. increases Discuss
Correct Answer: decreases
- 3. An evaporator is also known as
Options- A. freezing coil
- B. cooling coil
- C. chilling coil
- D. all of these Discuss
Correct Answer: all of these
- 4. Stefan-Boltzmann law is applicable for heat transfer by convection.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Disagree
- 5. The unit of Stefan-Boltzmann constant is
Options- A. Watt/mK
- B. Watt/m2K2
- C. Watt/m2K4
- D. Watt/mK2 Discuss
Correct Answer: Watt/m2K4
- 6. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. The ratio of the energy absorbed by the body to the total energy falling on it, is called
Options- A. absorptive power
- B. emissive power
- C. emissivity
- D. none of these Discuss
Correct Answer: absorptive power
- 8. The emissive power of a body depends upon its
Options- A. temperature
- B. physical nature
- C. wave length
- D. all of these Discuss
Correct Answer: all of these
- 9. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. In a psychrometric chart, specific humidity (moisture content) lines are
Options- A. vertical and uniformly spaced
- B. horizontal and uniformly spaced
- C. horizontal and non-uniformly spaced
- D. curved lines Discuss
Correct Answer: horizontal and uniformly spaced
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