Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Stefan-Boltzmann law is applicable for heat transfer by convection.
Options- A. Agree
- B. Disagree
- Correct Answer
- Disagree
- 1. An evaporator is also known as
Options- A. freezing coil
- B. cooling coil
- C. chilling coil
- D. all of these Discuss
- 2. Thermal conductivity of solid metals __________ with rise in temperature.
Options- A. remains same
- B. decreases
- C. increases Discuss
- 3. During sensible cooling of air, specific humidity
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 4. In a refrigeration system, the expansion device is connected between the
Options- A. compressor and condenser
- B. condenser and receiver
- C. receiver and evaporator
- D. evaporator and compressor Discuss
- 5. In counter-current flow heat exchangers
Options- A. both the fluids at inlet are in their hottest state
- B. both the fluids at inlet are in their coldest state
- C. both the fluids at exit are in their hottest state
- D. one fluid is coldest and the other is hottest at inlet Discuss
- 6. The unit of Stefan-Boltzmann constant is
Options- A. Watt/mK
- B. Watt/m2K2
- C. Watt/m2K4
- D. Watt/mK2 Discuss
- 7. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.
Options- A. True
- B. False Discuss
- 8. 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
- 9. The emissive power of a body depends upon its
Options- A. temperature
- B. physical nature
- C. wave length
- D. all of these Discuss
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: all of these
Correct Answer: decreases
Correct Answer: remains constant
Correct Answer: receiver and evaporator
Correct Answer: both the fluids at inlet are in their hottest state
Correct Answer: Watt/m2K4
Correct Answer: True
Correct Answer: absorptive power
Correct Answer: all of these
Correct Answer:
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