Air Refrigerator Working on Reverse Carnot Cycle MCQ

Test your knowledge with important Air Refrigerator Working on Reverse Carnot Cycle MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Air Refrigerator Working on Reverse Carnot Cycle MCQs at Bissoy

• A refrigerator works on a reversed Carnot cycle. The Coefficient of performance is 7. If the capacity of the refrigerator is 12 TR. What is the value of heat rejected from the system?
  ক

  46 kW

  খ

  50 kW

  গ

  42 kJ/min

  ঘ

  48 kJ/min
• A refrigerator works on a reversed Carnot cycle. The Coefficient of performance is 3.5. If the capacity of the refrigerator is 6 TR. Find out the power required to run the refrigerator.
  ক

  5 kW

  খ

  3.5 kW

  গ

  360 kJ/min

  ঘ

  520 kJ/min
• Two refrigerators M and N operate in series. The refrigerator M absorbs energy at the rate of 1 kW from a body at temperature 400 K and rejects energy as heat to a body at a temperature T. The refrigerator N absorbs the same quantity of energy which is rejected by the refrigerator N from the body at temperature T, and rejects energy as heat to a body at temperature 800 K. If both the refrigerators have the same C.O.P., what is the value temperature T?
  ক

  600 K

  খ

  200 K

  গ

  565.68 K

  ঘ

  459.21 K
• C.O.P. of the refrigerator is always _____ the C.O.P. of the heat pump when both are working between the same temperature limits.
  ক

  less than

  খ

  greater than

  গ

  equal to

  ঘ

  inverse of
• A reversed Carnot cycle is operating between temperature limits of 272 K and (+) 49°C. If it acts as a heat engine gives an efficiency of 15.52%. What is the value of C.O.P. of a refrigerator operating under the same conditions?
  ক

  6.44

  খ

  0.1838

  গ

  5.44

  ঘ

  2
• If the reversed Carnot cycle operating as a refrigerator between temperature limits of 405 K and 255 K, then what is the value of C.O.P.?
  ক

  2.7

  খ

  0.588

  গ

  1.7

  ঘ

  0.370
• The C.O.P. of a reversed Carnot refrigerator is 5. What is the ratio of highest temperature to lower temperature?
  ক

  −1.2

  খ

  0.8

  গ

  1.2

  ঘ

  −0.8
• The efficiency of Carnot heat engine is 40%. What is the value of C.O.P. of a refrigerator operating on reversed Carnot cycle?
  ক

  2.5

  খ

  1.5

  গ

  4

  ঘ

  10
• If the condenser and evaporator temperatures are 320 K and 240 K respectively, then what is the value of the C.O.P.?
  ক

  0.25

  খ

  4

  গ

  0.33

  ঘ

  3
• In a refrigerating machine working on the reversed Carnot cycle, if the lower temperature is fixed, then what can be done to increase the C.O.P.?
  ক

  Increasing higher temperature

  খ

  Operating machine at higher speed

  গ

  Decreasing higher temperature

  ঘ

  Operating machine at a lower speed
• If a refrigeration system having T1 and T2 as lower and higher temperatures respectively then, what is the value of C.O.P of the refrigeration system working on the reversed Carnot cycle?
  ক

  T2 / (T2 − T1)

  খ

  (T2 − T1) / T1

  গ

  (T2 − T1) / T2

  ঘ

  T1 / (T2 − T1)
• Out of the following reasons which one is responsible for Carnot cycle not being used in practice?
  ক

  It gives low COP

  খ

  It gives high refrigeration effect

  গ

  It gives low refrigeration effect

  ঘ

  It has low theoretical efficiency
• For a refrigerating system that works on Carnot cycle having air or gas as refrigerant s, which one of the following is not a process of the cycle in p-v diagram?
  ক

  Adiabatic compression process

  খ

  Isothermal compression process

  গ

  Adiabatic expansion process

  ঘ

  Isentropic expansion process
• Which one is not a limitation of the Carnot cycle with air or gas as refrigerant?
  ক

  It has low efficiency when working between two fixed temperature limits

  খ

  Machine has to run at high and low speeds during adiabatic and isothermal process. Such variation of speed is not possible

  গ

  Extreme pressure and large volume are developed

  ঘ

  It is not possible to carry out isothermal heat transfer process in practice
• The COPr of a Carnot refrigerating machine is 7.89. What will be the COPp of heat pump?
  ক

  10.3

  খ

  7.89

  গ

  8.89

  ঘ

  6.89
• What happens to the COP of a Carnot refrigerator in summer and in winter?
  ক

  The COP is more in winter

  খ

  The COP is more in summer

  গ

  The COP remains unaffected

  ঘ

  The COP fluctuates continuously during winter and summer
• For a refrigerating system that works on reversed Carnot cycle having vapor as refrigerant, which one of the following is not a process of the cycle in p-v diagram?
  ক

  Isentropic compression process

  খ

  Isothermal compression process

  গ

  Adiabatic expansion process

  ঘ

  Isothermal expansion process