heat-transfer-refrigeration-and-air-conditioning mechanical-engineering question and answers -Page 25

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Heat Transfer, Refrigeration and Air Conditioning problems

2. The critical temperature is the temperature
Options
A. below which a gas does not obey gas laws
B. above which a gas may explode
C. below which a gas is always liquified
D. above which a gas will never liquified

3. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Options
A. it considerably reduces mass of the system
B. it improves the C.O.P., as the condenser is small
C. the positive work in isentropic expansion of liquid is very small
D. it leads to significant cost reduction

6. The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
Options
A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
D. none of these

7. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
Options
A. automatic expansion valve
B. high side float valve
C. thermostatic expansion valve
D. low side float valve

9. Dry bulb temperature is the temperature of air recorded by a thermometer, when
Options
A. it is not affected by the moisture present in the air
B. its bulb is surrounded by a wet cloth exposed to the air
C. the moisture present in it begins to condense
D. none of the above

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