| 1. | The most commonly used method for the design of duct size is the ? | |
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velocity reduction method
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equal friction method
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static regain method
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dual or double method
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Report Question| 2. | Which of the following refrigerant is highly toxic and flammable ? | |
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Ammonia
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Carbon dioxide
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Sulphur dioxide
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R-12
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| 3. | A one tonne refrigerating machine means that ? | |
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one tonne is the total mass of machine
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one tonne refrigerant is used
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one tonne of water can be converted into ice
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one tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
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| 4. | The transfer of heat by molecular collision is smallest in ? | |
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solids
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liquids
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gases
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none of these
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| 5. | Which of the following refrigerant has the highest freezing point ? | |
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Ammonia
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Carbon dioxide
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Sulphur dioxide
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R-12
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| 6. | The reciprocating refrigerant compressors are very suitable for ? | |
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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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| 7. | In a refrigeration system, the expansion device is connected between the ? | |
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compressor and condenser
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condenser and receiver
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receiver and evaporator
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evaporator and compressor
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| 8. | The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called ? | |
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humidity ratio
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relative humidity
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absolute humidity
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degree of saturation
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| 9. | Wet bulb temperature is the temperature of air recorded by a thermometer, when ? | |
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it is not effected by the moisture present in the air
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its bulb is surrounded by a wet cloth exposed to the air
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the moisture present in it begins to condense
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none of the above
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| 10. | The curved lines on a psychrometric chart indicates ? | |
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dry bulb temperature
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wet bulb temperature
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dew point temperature
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relative humidity
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