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Heat Transfer, Refrigeration and Air Conditioning - Section 1 (3)

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  • Heat Transfer, Refrigeration and Air Conditioning - Section 1
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Heat Transfer, Refrigeration and Air Conditioning - Section 1

17. 

The heat transfer by radiation __________ a medium.

A. requires
B. does not require

Answer: Option B

Explanation:

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18. 

An electrolux refrigerator is called a __________ absorption system.

A. single fluid
B. two fluids
C. three fluids

Answer: Option C

Explanation:

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19. 

The heat transfer takes place according to

A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kirchhoff's law

Answer: Option C

Explanation:

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20. 

While designing the refrigeration system of an aircraft, the prime consideration is that the

A. system has high C.O.P.
B. power per TR is low
C. mass of refrigerant circulated in the system is low
D. mass of the refrigeration equipment is low

Answer: Option D

Explanation:

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21. 

The highest thermal diffusivity is of

A. iron
B. lead
C. concrete
D. wood

Answer: Option B

Explanation:

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22. 

For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

A. copper
B. aluminium
C. steel
D. brass

Answer: Option C

Explanation:

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23. 

The amount of radiation mainly depends upon the

A. nature of the body
B. temperature of the body
C. type of surface of the body
D. all of these

Answer: Option D

Explanation:

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24. 

In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

A. 0.3
B. 0.6
C. 0.67
D. 1.5

Answer: Option B

Explanation:

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