JNTU Ananthapur Basic civil and mechanical engineering sixth unit multiple choice questions and answers

1. • 1.Refrigeration defined as the process of
providing and maintaining a temperature
well below that of surrounding atmosphere.
• A.True
• B.False

2. 2.…………..is defined as the quantity of heat
extracted from a cold body or space to be cooled
in a given time.
A. Refrigerating Effect
B. One ton of refrigeration
C. Refrigeration
D.none

3.  3.One ton of refrigeration is defined as, “the quantity
of heat abstracted (refrigerating effect) to freeze one
ton of water into one ton of ice in a duration of 24
hours at 0o c”.
• A.False
• B.True

4. 4.………….defined as the ratio of heat extracted in
a given time (refrigerating effect) to the work
input.
• A. One ton of refrigeration
• B. Refrigeration
• C. Co efficient of Performance
• D.none

5. 5.Refrigerant Any substance that absorbs heat
through expansion and vaporization process and
loses heat due to condensation is a refrigeration
process is called refrigerant.
• A.False
• B.True

6. 6.Identify examples of refrigerants
A. Air, Freon – 12
B. Ammonia (NH3
C. Carbon dioxide (CO2)
D. Sulphur dioxide (SO2)
E.All

7. 7.Primary Refrigerants
A. Ammonia (NH3),
B. Carbon dioxide (CO2),
C. Sulphur dioxide (SO2
D.All

8. 8.Vapour Compression Refrigeration
System COP is ----------
A. Less
B. more
C.Zero
D.none

9. 9.In Vapour Compression Refrigeration
System ---------is needed to drive the system
• A.Mechanical
• B.Thermal
• C. Electric power
• D.Nuclear

10. 10.Air Conditioning is the process of
conditioning the air according to the human
comfort, irrespective of external conditions.
• A.False
• B.True

11. 11…………..is the study of the properties of
atmospheric air.
• A. Moisture
• B. Temperature
• C. Dry air
• D. Psychrometry

12. 12.…………The atmospheric air which no
water vapor is called dry air.
• A. Moisture
• B. Temperature
• C. Dry air
• D. Psychrometry

13. 13.……….The degree of hotness (or) Coldness
is called the temperature.
• A. Moisture
• B. Temperature
• C. Dry air
• D. Psychrometry

14. 14.…………Moisture is the water vapour
present in the air.
• A. Moisture
• B. Temperature
• C. Dry air
• D. Psychrometry

15. 15……………is the temperature of air measured by
the ordinary thermometer is called dry bulb
temperature:
• A.Dry bulb temperature
• B. Wet bulb temperature
• C. Humidity
• D. Relative humidity

16. 16--------- is t he temperature of air measured by
the thermometer when it is covered by the wet
cloth is known as wet bulbTemperature
• A.Dry bulb temperature
• B. Wet bulb temperature
• C. Humidity
• D. Relative humidity

17. 17.----------is the temperature at which the water
vapour starts condensing is called dew point
Temperature
• A.Dry bulb temperature
• B. Wet bulb temperature
• C. Dew pointTemperature:
• D. Relative humidity

18. 18.------------Relative humidity is the ratio of actual
mass of water vapour in a given volume to the
mass of water vapour actually can withhold by
the same volume.
• A.Dry bulb temperature
• B. Wet bulb temperature
• C. Dew pointTemperature:
• D. Relative humidity

19. • 19.In the vapor absorption system the
refrigerant used is ammonia, water or lithium
bromide.
• A.False
• B.True

20. 18.The domestic absorption type refrigerator
was invented by two Swedish engineers Carl
Munters and Baltzer Von Platan in
• A.1925
• B. 1935
• C. 1945
• D. 1955