Engineering :: Refrigeration and Air conditioning

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101.

Which refrigerant has the highest critical point temperature?

A.	Ammonia	B.	Freon 11
C.	Freon 12	D.	Freon 22
E.	None of the above

102.

The statement that molecular weight of all gases occupy the same volume at NTP is known as

A.	Dalton's law	B.	Avogadro's law
C.	First law of thermodynamics	D.	Joules law
E.	Charle's law

103.

A Carnot refrigerator extracts 100 kcal of heat per minute from a cold room which is maintained at - 15?C and it is discharged to atmosphere 30C?. The horse power required to run the unit would be

A.	1	B.	1.5 to 2
C.	2 to 5	D.	5 to 6
E.	More than 6

104.

2 HP per ton of refrigeration is required to maintain the temperature of - 40?C in the refrigerator if the refrigeration cycle works on Carnot cycle. The COP of the cycle would be

A.	1	B.	0.4
C.	2.38	D.	4.76
E.	5

105.

The effect of under cooling the refrigerant is to

A.	Reducing the COP of the cycle	B.	Increase the COP of the cycle
C.	Reduce the refrigerating effect	D.	Increase the super heat of vapour
E.	None of the above

106.

White ice is

A.	Sub-cooled water	B.	Fast cooled water
C.	Due to dissolved air, gases and impurities	D.	Produced by blowing air during freezing
E.	None of the above

107.

Clear ice

A.	Is pure ice	B.	Contains dissolved air
C.	Contains dissolved gases	D.	Is produced by blowing air during freezing
E.	None of the above

108.

Dry ice is

A.	Free from water	B.	Free from dissolved air or gases
C.	Does not contain impurities	D.	Solidified form of carbondioxide
E.	None of the above

109.

A cooling tower in a refrigeration system

A.	Removes heat from refrigerant	B.	Removes heat from brine
C.	Removes heat from lubricating oil	D.	Removes heat from hot water coming out of condenser
E.	None of the above

110.

At 100% humidity

A.	We bulb temperature is same as atmospheric temperature	B.	Dry bulb temperature is same as atmospheric temperature
C.	Wet bulb temperature is same as dry bulb temperature	D.	Wet bulb temperature is exactly half the dry bulb temperature
E.	Dry bulb temperature is exactly half the wet bulb temperature