| 1. | In a vapour compression system, the condition of refrigerant before passing through the condenser is ? | |
|
saturated liquid
|
||
|
wet vapour
|
||
|
dry saturated vapour
|
||
|
superheated vapour
|
||
View Answer
Discuss in Forum
Report Question| 2. | The emissivity of a polished silver body is ............. as compared to black body ? | |
|
same
|
||
|
low
|
||
|
very low
|
||
|
high
|
||
| 3. | One tonne of refrigeration (1TR) means that the heat removing capacity is ? | |
|
21 kJ/min
|
||
|
210 kJ/min
|
||
|
420 kJ/min
|
||
|
620 kJ/min
|
||
| 4. | The condition of refrigerant after passing through the condenser in a vapour compression system is ? | |
|
saturated liquid
|
||
|
wet vapour
|
||
|
dry saturated vapour
|
||
|
superheated vapour
|
||
| 5. | The coefficient of performance of electrolux refrigerator is the ratio of ? | |
|
heat supplied by the gas burner to the heat absorbed by the evaporator
|
||
|
heat absorbed by the evaporator to the heat supplied by the gas burner
|
||
|
heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
|
||
|
heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
|
||
| 6. | In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by ? | |
|
liquid pump
|
||
|
generator
|
||
|
absorber and generator
|
||
|
absorber, generator and liquid pump
|
||
| 7. | Which of the following statement is correct ? | |
|
In vapour absorption refrigerator, the compression of refrigerent is avoided
|
||
|
Sub-cooling can be achieved by circulating more quantity of cooling water through condenser
|
||
|
In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke
|
||
|
all of the above
|
||
| 8. | Which of the following statement is wrong ? | |
|
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures
|
||
|
In vapour compression cycle, the useful part of the heat transfer is at the condenser
|
||
|
In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required
|
||
|
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance
|
||
| 9. | A good refrigerant should have ? | |
|
high latent heat of vaporisation and low freezing point
|
||
|
high operating pressures and low freezing point
|
||
|
high specific volume and high latent heat of vaporisation
|
||
|
low C.O.P. and low freezing point
|
||
| 10. | A refrigerant with the highest critical pressure is ? | |
|
R-11
|
||
|
R-12
|
||
|
R-22
|
||
|
Ammonia
|
||