McqMate
Chapters
| 1. |
Heat is absorbed by the refrigerant, during vapour compression refrigeration cycle in |
| A. | Compressor |
| B. | Condenser |
| C. | Evaporator |
| D. | Throttle valve |
| Answer» C. Evaporator | |
| 2. |
In a simple saturated vapour compression cycle, the refrigerant is in superheated condition |
| A. | before entering compressor |
| B. | before entering condenser |
| C. | before entering throttle valve |
| D. | before entering evaporator |
| Answer» B. before entering condenser | |
| 3. |
Sub-cooling is a process of cooling the refrigerant in vapour compression refrigeration system |
| A. | after compression |
| B. | before compression |
| C. | before Throttling |
| D. | none of the above |
| Answer» C. before Throttling | |
| 4. |
The order in which main components of vapour compression refrigeration system are used is |
| A. | compressor-evaporator-condenser-throttle valve |
| B. | compressor-condenser-evaporator-throttle valve |
| C. | compressor-throttle valve- evaporator-condenser |
| D. | compressor-condenser- throttle valve- evaporator |
| Answer» D. compressor-condenser- throttle valve- evaporator | |
| 5. |
The oil separator is incorporated in vapour compression refrigeration system |
| A. | between evaporator and compressor |
| B. | between compressor and condenser |
| C. | between condenser and Throttle valve |
| D. | between throttle valve and evaporator |
| Answer» B. between compressor and condenser | |
| 6. |
In vapour compression refrigeration cycle the following data is available Heat rejected in condenser = 65 KW Work done in compressor = 10 kw, then COP( refrigerator) is |
| A. | 4.5 |
| B. | 5.5 |
| C. | 6.5 |
| D. | not possible to find with the given data |
| Answer» B. 5.5 | |
| 7. |
Following results are tabulated for vapour compression refrigeration cycle.
|
| A. | 3.5 |
| B. | 4.5 |
| C. | 5.5 |
| D. | 6.5 |
| Answer» C. 5.5 | |
| 8. |
For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the evaporator pressure is lowest for |
| A. | R-11 |
| B. | R-12 |
| C. | R-717 |
| D. | R-22 |
| Answer» A. R-11 | |
| 9. |
For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the compressor displacement per min per ton of refrigeration is highest for |
| A. | R-11 |
| B. | R-12 |
| C. | R-717 |
| D. | R-22 |
| Answer» A. R-11 | |
| 10. |
With reciprocating compressor in vapour compression refrigeration system, wetcompression is not desirable because |
| A. | liquid trapped up in the head of cylinder may damage the compressor valves |
| B. | COP of the cycle decreases |
| C. | volumetric efficiency of compressor decreases |
| D. | mass flow rate per ton of refrigerant increases |
| Answer» A. liquid trapped up in the head of cylinder may damage the compressor valves | |
| 11. |
An ideal refrigerant should have |
| A. | low latent heat of vaporization |
| B. | high critical temperature |
| C. | high boiling point |
| D. | high specific volume of vapour |
| Answer» B. high critical temperature | |
| 12. |
The refrigerant leaving throttle valve is |
| A. | saturated liquid |
| B. | saturated vapour |
| C. | superheated vapour |
| D. | fraction as saturated vapour and remainder as liquid |
| Answer» D. fraction as saturated vapour and remainder as liquid | |
| 13. |
Freon group of refrigerants |
| A. | toxic |
| B. | inflammable |
| C. | non-toxic and non-inflammable |
| D. | highly toxic and inflammable |
| Answer» C. non-toxic and non-inflammable | |
| 14. |
The leaks of refrigerant from a cycle may be detected by |
| A. | halide torch test |
| B. | sulphur candle test |
| C. | soap and water test |
| D. | any of the above |
| Answer» D. any of the above | |
| 15. |
During compression in a vapour compression cycle the refrigerant is super heated |
| A. | work done is increased |
| B. | C.O.P is increased |
| C. | Work done is reduced |
| D. | Refrigerating effect is reduced |
| Answer» A. work done is increased | |
| 16. |
Heat is rejected by the refrigerant, during vapour compression refrigeration cycle in |
| A. | Compressor |
| B. | Condenser |
| C. | Evaporator |
| D. | Throttle valve |
| Answer» B. Condenser | |
| 17. |
Wet compression vapour compression refrigeration cycle means |
| A. | Vapour compression takes place in wet region |
| B. | Vapour compression in dry region, but evaporation in wet region |
| C. | vapour compression in wet region, but leaves in superheated region |
| D. | None of the above |
| Answer» A. Vapour compression takes place in wet region | |
| 18. |
For simple saturated vapour compression refrigeration cycle operating between 5°C and 40°C, and the refrigerants being R-11, R-12, R-717 and R-22, the evaporator pressure is highest for |
| A. | R-11 |
| B. | R-12 |
| C. | R-717 |
| D. | R-22 |
| Answer» D. R-22 | |
| 19. |
With reciprocating compressor in vapour compression refrigeration system, wet compression is not desirable because |
| A. | liquid trapped up in the head of cylinder may damage the compressor valves |
| B. | COP of the cycle decreases |
| C. | volumetric efficiency of compressor decreases |
| D. | mass flow rate per ton of refrigerant increases |
| Answer» A. liquid trapped up in the head of cylinder may damage the compressor valves | |
| 20. |
An ideal refrigerant should have |
| A. | low latent heat of vaporization |
| B. | lower critical temperature |
| C. | lower boiling point |
| D. | high specific volume of vapour |
| Answer» C. lower boiling point | |
| 21. |
During compression in a vapour compression cycle the refrigerant is super heated |
| A. | C.O.P is reduced |
| B. | C.O.P is increased |
| C. | Work done is reduced |
| D. | Refrigerating effect is reduced |
| Answer» A. C.O.P is reduced | |
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