92) Which of the following statement is correct?

The constant enthalpy lines are also constant wet bulb temperature lines.

The wet bulb and dry bulb temperature are equal at saturation condition.

The wet bulb temperature is a measure of enthalpy of moist air.

all of the above

Answer is:

all of the above

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93) According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

Correct

Incorrect

Answer is:

Correct

Explanation:

According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature. Stefan Boltzmann law is applicable for heat transfer by radiation.

94) In electrolux refrigerator

ammonia is absorbed in hydrogen

ammonia is absorbed in water

ammonia evaporates in hydrogen

hydrogen evaporates in ammonia

Answer is:

ammonia evaporates in hydrogen

95) Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity

one

two

three

four

Answer is:

three

96) A boot-strap air cooling system has

one heat exchanger

two heat exchangers

three heat exchangers

four heat exchangers

Answer is:

two heat exchangers

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