Engineering :: Refrigeration and Air conditioning

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61.

If a room has bad ammonia leaks

A.	Before entering the room fans should be put on	B.	Lights should be switched off
C.	One should wait for sometime	D.	Gas mask should be put on
E.	No specific precautions are needed

62.

Freon type (halocarbons) refrigerants are

A.	Poisonous	B.	Irritating
C.	Non-poisonous	D.	Coloured
E.	Have peculiar odour

63.

Cryogenics

A.	Is same as refrigeration	B.	Include heating and cooling of liquids
C.	Is a thermodynamic analysis of low temperature systems	D.	Is the field of engineering associated with development, production and use of equipment in the range -180?C to absolute zero
E.	None of the above

64.

The change in temperature resulting from a gas expanding from one constant pressure, with no heat transfer and no external work other than to maintain the constant pressure is known as

A.	Dalton's law of partial pressures	B.	Law of conservation of energy
C.	Kinetic theory of gases	D.	Avogadro's hypothesis
E.	Joule - Thomoson effect

65.

An average adult while sitting in a cinema hall

A.	Absorbs about 100 kcal of heat per hour	B.	Absorbs about 500 kcal of heat per hour
C.	Discards about 500 kcal of heat per hour	D.	Discharges about 100 kcal of heat per hour
E.	Neither absorbs nor discards heat

66.

While designing air conditioning system for a theatre the various heat loads are categorized as given below. Which one will give lowest heat load?

A.	Direct sun	B.	Human beings
C.	Lights	D.	Outside temperature in summer

67.

In a psychrometric chart vertical lines indicate

A.	Dry bulb temperature	B.	Wet bulb temperature
C.	Dew point temperature	D.	Percentage humidity
E.	Relative humidity

68.

In a psychrometric chart horizontal line indicate

A.	Dry bulb temperature	B.	Wet bulb temperature
C.	Dew point temperature	D.	Percentage humidity
E.	Relative humidity

69.

For better performance a desert cooler

A.	Should be placed inside the room	B.	Should be placed outside
C.	Should be mounted on window	D.	Should be placed at the roof level
E.	None of the above

70.

In rainy season desert coolers become ineffective

A.	Because of low temperature	B.	Pleasant weather
C.	Rain serves the purpose of cooler	D.	Humidity of air increases
E.	None of the above