| 1. | The material of pipe lines for a system using freon as a refrigerant should be ? | |
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brass
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copper
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steel
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aluminium
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Report Question| 2. | The refrigerant supplied to a compressor must be ? | |
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superheated vapour refrigerant
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dry saturated liquid refrigerant
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a mixture of liquid and vapour refrigerant
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none of these
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| 3. | The thermostatic expansion valve is also called ? | |
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constant pressure valve
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constant temperature valve
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constant superheat valve
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none of these
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| 4. | In a saturated air-water vapour mixture, the ? | |
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dry bulb temperature is higher than wet bulb temperature
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dew point temperature is lower than wet bulb temperature
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dry bulb, wet bulb and dew point temperature are same
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dry bulb temperature is higher than dew point temperature
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| 5. | During sensible heating of air .............. decreases ? | |
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wet bulb temperature
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relative humidity
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dry bulb temperature
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specific humidity
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| 6. | During sensible cooling of air ........ decreases ? | |
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wet bulb temperature
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relative humidity
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dry bulb temperature
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specific humidity
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| 7. | During dehumidification process ................ remains constant ? | |
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wet bulb temperature
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relative humidity
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dry bulb temperature
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specific humidity
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| 8. | During heating and humidification, the final relative humidity of air ? | |
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is higher than that of the entering air
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is lower than that of the entering air
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can be lower or higher than that of the entering air
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none of the above
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| 9. | A human body feels comfortable when the heat produced by the metabolism of human body is equal to the ? | |
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heat dissipated to the surroundings
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heat stored in the human body
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sum of (a) and (b)
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difference of (a) and (b)
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| 10. | Air conditioning means ? | |
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cooling
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heating
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dehumidifying
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all of these
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