MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Pure refrigerant vapour is obtained for the condenser in a vapour absorption cooling system: |
| A. | By exchanging heat with the weak ammonia-water solution |
| B. | Directly from the evaporator |
| C. | By supplying the heat to the generator where ammonia gets released |
| D. | By feeding from an external reservoir |
| Answer» D. By feeding from an external reservoir | |
| 2. |
A refrigerant mostly used for the reciprocating compressor is |
| A. | NH3 |
| B. | CO2 |
| C. | Freon - 12 |
| D. | Freon - 22 |
| Answer» D. Freon - 22 | |
| 3. |
In the ammonia-water vapour absorption refrigeration cycle, the refrigerant used is: |
| A. | water |
| B. | brine |
| C. | NH3 |
| D. | R-22 |
| Answer» D. R-22 | |
| 4. |
Moisture in a refrigerant system is removed by _______.A. DriersB. Filter driersC. Desiccants |
| A. | only A |
| B. | only B |
| C. | only C |
| D. | A, B and C |
| Answer» E. | |
| 5. |
Ideal refrigerant should not have : |
| A. | positive pressure in evaporator |
| B. | high latent heat of vaporisation |
| C. | high thermal conductivity |
| D. | high boiling temperature at atmospheric pressure |
| Answer» E. | |
| 6. |
An undesirable property of a refrigerant is its: |
| A. | low freezing point |
| B. | low viscosity |
| C. | high miscibility with lubricating oil |
| D. | low latent heat of evaporation |
| Answer» E. | |
| 7. |
In an Electrolux refrigerator |
| A. | Ammonia is absorbed in water |
| B. | Ammonia is absorbed in hydrogen |
| C. | Hydrogen is evaporated in ammonia |
| D. | Ammonia is evaporated in hydrogen |
| Answer» E. | |
| 8. |
Fittings in ammonia absorption refrigeration system are made of _____. |
| A. | Cast steel or forgings |
| B. | Copper |
| C. | Brass |
| D. | Aluminium |
| Answer» B. Copper | |
| 9. |
Modified polyol ester is a suitable lubricant in a refrigeration system with the refrigerant: |
| A. | R-11 |
| B. | R-134a |
| C. | R-245fa |
| D. | R-12 |
| Answer» C. R-245fa | |
| 10. |
A mixture of refrigerants having a fixed boiling point is called: |
| A. | Primary refrigerant |
| B. | Brine |
| C. | Secondary refrigerant |
| D. | Azeotropic mixture |
| Answer» E. | |
| 11. |
Lithium bromide in vapour absorption refrigeration system is used as _____. |
| A. | refrigerant |
| B. | cooling substance |
| C. | auxiliary refrigerant |
| D. | absorbent |
| Answer» E. | |