Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
Thermal conductivity of solid metals __________ with rise in temperature.
Options- A. remains same
- B. decreases
- C. increases
- Correct Answer
- decreases
- 1. During sensible cooling of air, specific humidity
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 2. 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
- 3. 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
- 4. The heating of air, without any change in its specific humidity, is known as sensible heating.
Options- A. True
- B. False Discuss
- 5. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about
Options- A. 1
- B. 1.25
- C. 2.15
- D. 5.12 Discuss
- 6. An evaporator is also known as
Options- A. freezing coil
- B. cooling coil
- C. chilling coil
- D. all of these Discuss
- 7. Stefan-Boltzmann law is applicable for heat transfer by convection.
Options- A. Agree
- B. Disagree Discuss
- 8. The unit of Stefan-Boltzmann constant is
Options- A. Watt/mK
- B. Watt/m2K2
- C. Watt/m2K4
- D. Watt/mK2 Discuss
- 9. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.
Options- A. True
- B. False Discuss
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: remains constant
Correct Answer: receiver and evaporator
Correct Answer: both the fluids at inlet are in their hottest state
Correct Answer: True
Correct Answer: 1.25
Correct Answer: all of these
Correct Answer: Disagree
Correct Answer: Watt/m2K4
Correct Answer: True
Correct Answer: absorptive power
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.