Lakshya Education MCQs

Question: In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
Options:
A. High, of the order of 25°
B. As low as possible (3 to 11°C)
C. Zero
D. Any value
Answer: Option B
Explanation :

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More Questions on This Topic :

Question 1. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called
  1.     Wet bulb temperature
  2.     Dry bulb temperature
  3.     Dew point temperature
  4.     None of these
Answer: Option B
Explanation :
Question 2. The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
  1.     Wet bulb temperature
  2.     Dry bulb temperature
  3.     Dew point temperature
  4.     None of these
Answer: Option A
Explanation :
Question 3. The thermostatic expansion valve operates on the changes in the
  1.     Degree of superheat at exit from the evaporator
  2.     Temperature of the evaporator
  3.     Pressure in the evaporator
  4.     None of the above
Answer: Option A
Explanation :
Question 4. In a domestic vapour compression refrigerator, the refrigerant commonly used is
  1.     CO?
  2.     Ammonia
  3.     R-12
  4.     All of these
Answer: Option C
Explanation :
Question 5. The minimum temperature to which water can be cooled in a cooling tower is
  1.     Dew point temperature of air
  2.     Wet bulb temperature of air
  3.     Dry bulb temperature of air
  4.     Ambient air temperature
Answer: Option B
Explanation :
Question 6. Air refrigeration cycle is used in
  1.     Domestic refrigerators
  2.     Commercial refrigerators
  3.     Air conditioning
  4.     Gas liquefaction
Answer: Option D
Explanation :

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