Refrigeration & Air-Conditioning True/False Quiz-1

01. The temperature rise, between the condenser outlet and expansion valve in ammonia vapour

compression system, should be as low as possible.

A) Yes

B) No

02. During sub-cooling, sensible heat from a liquid refrigerant is removed.

A) Yes

B) No

03. The expression [Pv (Pb - Pd)/ Pd (Pb - Pv)] is used for calculating relative humidity.

A) Yes

B) No

04. The final relative humidity of the air during cooling and dehumidification is generally

__________ than that of entering air.

A) Lower

B) Higher

05. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour

line represents sub-cooled liquid region.

A) True

B) False

06. R-11 has the highest critical point temperature.

A) Correct

B) Incorrect

07. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.

A) True

B) False

08. When the discharge pressure is too high in a refrigeration system, high pressure control is

installed to stop the compressor.

A) Correct

B) Incorrect

09. In absorption vapour systems, the refrigerant widely used is R-12.

A) Correct

B) Incorrect

10. A Bell Coleman refrigerator working on dense air system as compared to open air system, for

the same range of temperature, results in higher coefficient of performance.

A) Agree

B) Disagree

11. Dew point temperature is the temperature of air recorded by a thermometer, when the

moisture present in it begins to condense.

A) Correct

B) Incorrect

12. If the condenser temperature is kept constant, the coefficient of performance of a

refrigeration cycle increases with the increase in evaporator temperature.

A) Yes

B) No

13. The relative humidity ________ as air gets drier.

A) Increases

B) Decreases

14. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.

A) True

B) False

15. The coefficient of performance of vapour compression refrigeration system is quite ________

as compared to air refrigeration system.

A) Low

B) High

16. During sensible cooling of air, the relative humidity increases.

A) Yes

B) No

17. The heating of air, without any change in its specific humidity, is known as sensible heating.

A) True

B) False

18. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.

A) Agree

B) Disagree

19. A condenser is used in the _________ pressure side of a refrigerating system.

A) Low

B) High

20. R-12 has the ________ freezing point.

A) Lowest

B) Highest

Answers: Refrigeration & Air-Conditioning-I

01. Answer: Option A 

02. Answer: Option A 

03. Answer: Option B 

04. Answer: Option B

05. Answer: Option B 

06. Answer: Option A 

07. Answer: Option A 

08. Answer: Option A

09. Answer: Option B 

10. Answer: Option A 

11. Answer: Option A 

12. Answer: Option A

13. Answer: Option A 

14. Answer: Option A 

15. Answer: Option B 

16. Answer: Option A

17. Answer: Option A 

18. Answer: Option A 

19. Answer: Option B 

20. Answer: Option A