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Question: The evaporator changes the low pressure liquid refrigerant from the expansion valve into
Options:
A. High pressure liquid refrigerant
B. Low pressure liquid and vapour refrigerant
C. Low pressure vapour refrigerant
D. None of these
Answer: Option C
Explanation :

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Question 1. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
  1.     Operating the machine at higher speeds
  2.     Operating the machine at lower speeds
  3.     Raising the higher temperature
  4.     Lowering the higher temperature
Answer: Option D
Explanation :
Question 2. Pressure of water vapour is given by
  1.     0.622 Pv/ (Pb - Pv)
  2.     μ/[1 - (1 - μ) (Ps/Pb)]
  3.     [Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
  4.     None of these
Answer: Option D
Explanation :
Question 3. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
  1.     Operating the machine at higher speeds
  2.     Operating the machine at lower speeds
  3.     Raising the higher temperature
  4.     Lowering the higher temperature
Answer: Option D
Explanation :
Question 4. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is
  1.     Less than 2 kg
  2.     More than or equal to 3.65 kg
  3.     More than 10 kg
  4.     There is no such consideration
Answer: Option B
Explanation :
Question 5. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
  1.     High pressure liquid refrigerant
  2.     Low pressure liquid and vapour refrigerant
  3.     Low pressure vapour refrigerant
  4.     None of these
Answer: Option C
Explanation :
Question 6. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
  1.     Operating the machine at higher speeds
  2.     Operating the machine at lower speeds
  3.     Raising the higher temperature
  4.     Lowering the higher temperature
Answer: Option D
Explanation :

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