Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

91) Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

Answer is:

Flourine

92) Which of the following statement is correct?

Answer is:

all of the above

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.

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

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

Answer is:

91) Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

Flourine

92) Which of the following statement is correct?

all of the above

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

94) In electrolux refrigerator

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

three