| 1. | A refrigerant compressor is used to ? | |
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raise the pressure of the refrigerant
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raise the temperature of the refrigerant
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circulate the refrigerant through the refrigerating system
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all of the above
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Report Question| 2. | The centrifugal compressors are generally used for refrigerants that require ? | |
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small displacements and low condensing pressures
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large displacements and high condensing pressures
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small displacements and high condensing pressures
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large displacements and low condensing pressures
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| 3. | The capillary tube, as an expansion device, is used in ? | |
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domestic refrigerators
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water coolers
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room air conditioners
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all of these
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| 4. | The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called ? | |
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wet bulb temperature
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dry bulb temperature
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dew point temperature
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none of these
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| 5. | The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called ? | |
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wet bulb temperature
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dry bulb temperature
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dew point temperature
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none of these
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| 6. | Moisture should be removed from refrigerants to avoid ? | |
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freezing at the expansion valve
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restriction to refrigerant flow
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corrosion of steel plates
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all of these
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| 7. | In a lithium bromide absorption refrigeration system ? | |
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lithium bromide is used as a refrigerant and water as an absorbent
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water is used as a refrigerant and lithium bromide as an absorbent
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ammonia is used as a refrigerant and lithium bromide as an absorbent
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none of the above
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| 8. | An ordinary passenger aircraft requires a cooling system of capacity ? | |
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2 TR
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4 TR
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8 TR
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10 TR
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| 9. | Which of the following statement is wrong ? | |
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The value of C.O.P. is always greater than one
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In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour
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The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region
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none of the above
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| 10. | In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively ? | |
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water and water
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water and lithium bromide
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ammonia and lithium bromide
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ammonia and water
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