McqMate
Chapters
| 1. |
Heat is absorbed by a refrigerant, during a refrigeration cycle in a |
| A. | condenser |
| B. | evaporator |
| C. | compressor |
| D. | throttle valve |
| Answer» B. evaporator | |
| 2. |
What is the effect of frost on the cooling coils of the evaporator of refrigeration system |
| A. | It reduces the life of cooling coils |
| B. | It increases the compressor pressure |
| C. | It makes the compressor run for comparatively short runs |
| D. | It acts as the insulator and decreases the heat transfer rate |
| Answer» D. It acts as the insulator and decreases the heat transfer rate | |
| 3. |
The widely used refrigerant in domestic refrigerators is |
| A. | Carbon-dioxide |
| B. | Sulphur dioxide |
| C. | Freon-12 |
| D. | Ammonia |
| Answer» C. Freon-12 | |
| 4. |
Freon group refrigerants are |
| A. | toxic |
| B. | inflamma |
| C. | nontoxic and inflammable |
| D. | non- toxic & non-inflammable |
| Answer» D. non- toxic & non-inflammable | |
| 5. |
Latent heat of vaporization of a refrigerant ,at lower temperatures and pressures |
| A. | increase |
| B. | decreases |
| C. | remains constant |
| D. | unpredictable |
| Answer» A. increase | |
| 6. |
The refrigerant with highest critical pressure is |
| A. | Carbon dioxide |
| B. | Ammonia |
| C. | Freon-11 |
| D. | Freon-22 |
| Answer» B. Ammonia | |
| 7. |
The Refrigerant commonly used in commercial ice plants is |
| A. | Carbon-dioxide |
| B. | Air |
| C. | Ammonia |
| D. | Freon-12 |
| Answer» C. Ammonia | |
| 8. |
Which of the following refrigerants has the lowest boiling point? |
| A. | Freon-12 |
| B. | Carbon-dioxide |
| C. | Ammonia |
| D. | Sulphur dioxide |
| Answer» B. Carbon-dioxide | |
| 9. |
In a flooded type of Evaporator which of the following types of expansion device is utilized |
| A. | Float Valve |
| B. | Thermostatic device |
| C. | Capillary tube |
| D. | Self actuated expansion valve |
| Answer» A. Float Valve | |
| 10. |
Which of the following statements are TRUE? |
| A. | A capillary tube is a variable opening area type expansion device |
| B. | In a capillary tube pressure drop takes place due to fluid friction |
| C. | In a capillary tube pressure drop takes place due to fluid acceleration |
| D. | In a capillary tube pressure drop takes place due to fluid friction and acceleration |
| Answer» D. In a capillary tube pressure drop takes place due to fluid friction and acceleration | |
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