Aptitude Test Questions on Air Refrigeration Cycles

1. What is unit of refrigeration?

(i) TR

(ii) PR

(iii) BR

(iv) QR

2. A tonne of refrigeration is defined as the amount of refrigeration effect produced by the uniform melting of one tonne of ice from and at 0 degree C in 24 hours.

(i) Agree

(ii) Disagree

3. The latent heat of ice is ………..

(i) 225 kJ/kg

(ii) 336 kJ/kg

(iii) 335 kJ/kg

(iv) 334 kJ/kg

4. In actual practice 1 TR is taken as equivalent to

(i) 232.6 kJ/min

(ii) 210 kJ/min

(iii) 3.5 kJ/min

(iv) 335 kJ/min

5. The C.O.P. of refrigerator is given by

(i) W/Q

(ii) Q/W

(iii) Q1/Q2

(iv) Q2/Q1

6. The ratio of actual C.O.P. to the theoretical C.O.P. is known as

(i) Relative coefficient of performance

(ii) Relative coefficient of discharge

(iii) Relative coefficient of power

(iv) Relative coefficient of cooling

7. The value of C.O.P of refrigerator is always ________ unity.

(i) Greater than

(ii) Less than

(iii) Equal to

(iv) None of the above

8. The coefficient of performance of a refrigerator is the reciprocal of the efficiency of heat engine. Is it true or false?

(i) false

(ii) true

9. find the cop of a refrigeration system if the work input is 80 kJ/kg and refrigeration effect produced is 160 kJ/kg of refrigerant flowing.

(i) 1

(ii) 3

(iii) 0.5

(iv) 2

10. In a refrigerating machine, heat rejected is _______ than heat absorbed.

(i) less

(ii) more

(iii) equal

(iv) none of the above

Answers: 

1.(i), 2.(i), 3.(iii), 4.(ii), 5.(ii), 6.(i), 7.(i), 8.(ii), 9.(iv), 10.(ii)