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| Q. |
In a refrigerator what produces the cooling? |
| A. | The ice which deposits on the freezer |
| B. | The sudden expansion of a compressed gas |
| C. | The evaporation of a volatile liquid |
| D. | None of these |
| Answer» D. None of these | |
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Explanation: Basically, refrigeration system consists of devices that compress and expand refrigerant gas. When refrigerant gas is compressed it expels heat and when it is suddenly expanded, absorbs heat. A refrigerator (colloquially fridge) is a common household appliance that consists of a thermally insulated compartment and a heat pump (mechanical, electronic, or chemical) that transfers heat from the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the ambient temperature of the room. |
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