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Mechanical Engineering
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Heat Transfer, Refrigeration and Air Conditioning
Comments
Question
In aircraft, air refrigeration Cycle is used because of
Options
A. low weight per tonne of refrigeration
B. high heat transfer rate
C. low temperature at high altitudes
D. higher coefficient of performance
Correct Answer
low weight per tonne of refrigeration
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
1. A refrigerant compressor is used to
Options
A. raise the pressure of the refrigerant
B. raise the temperature of the refrigerant
C. circulate the refrigerant through the refrigerating system
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
2. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
Options
A. liquid pump
B. generator
C. absorber and generator
D. absorber, generator and liquid pump
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Correct Answer: absorber, generator and liquid pump
3. The refrigerant used in small-tonnage commercial machines (hermetically sealed units) is
Options
A. ammonia
B. carbon dioxide
C. sulphur dioxide
D. R-12
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Correct Answer: sulphur dioxide
4. When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
Options
A. cooled and humidified
B. cooled and dehumidified
C. heated and humidified
D. heated and dehumidified
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Correct Answer: cooled and humidified
5. The lowest temperature during the cycle in a vapour compression system occurs after
Options
A. compression
B. expansion
C. condensation
D. evaporation
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Correct Answer: evaporation
6. The pressure at the inlet of a refrigerant compressor is called
Options
A. suction pressure
B. discharge pressure
C. critical pressure
D. back pressure
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Correct Answer: suction pressure
7. The power per tonne of refrigeration is
Options
A. 3.5/C.O.P.
B. C.O.P/3.5
C. 3.5 x C.O.P.
D. none of these
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Correct Answer: 3.5/C.O.P.
8. The angle on which the strength of the tool depends is
Options
A. rake angle
B. cutting angle
C. clearance angle
D. lip angle
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Correct Answer: rake angle
9. In centreless grinding, the surface speed of regulating wheel is
Options
A. 5 to 15 m/min
B. 15 to 60 m/min
C. 60 to 90 m/min
D. 90 to 120 m/min
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Correct Answer: 15 to 60 m/min
10. Which of the following statement is correct regarding grinding of high carbon steel?
Options
A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
B. Aluminium oxide wheels are employed.
C. The grinding wheel has to be of open structure.
D. all of the above
Show Answer
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Correct Answer: all of the above
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