McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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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