| 1. | The amount of radiation mainly depends upon the ? | |
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nature of the body
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temperature of the body
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type of surface of the body
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all of these
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Report Question| 2. | The emissivity for a black body is ? | |
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0
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0.5
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0.75
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1
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| 3. | The capacity of a domestic refrigerator is in the range of ? | |
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0.1 to 0.3 TR
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1 to 3 TR
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3 to 5 TR
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5 to 7 TR
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| 4. | The formation of frost on cooling coils in a refrigerator ? | |
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increases heat transfer
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improves C.O.P. of the system
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increases power consumption
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reduces power consumption
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| 5. | The superheated vapour region, in a pressure enthalpy chart, is represented by the space ? | |
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to the left of saturated liquid line
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to the right of saturated liquid line
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between the saturated liquid line and saturated vapour line
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none of the above
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| 6. | A vapour absorption refrigerator uses ....... as a refrigerant ? | |
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water
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ammonia
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freon
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aqua-ammonia
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| 7. | The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and ? | |
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carbon dioxide
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sulphur dioxide
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lithium bromide
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R-12
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| 8. | In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in ? | |
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condenser
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evaporator
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absorber
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none of these
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| 9. | The freon group of refrigerants are ? | |
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halo-carbon refrigerants
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azeotrope refrigerants
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inorganic refrigerants
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hydro-carbon refrigerants
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| 10. | The freezing point of sulphur dioxide is ? | |
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-56.6°C
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-75.2°C
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-77.7°C
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-135.8°C
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