A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?

Related Mcqs:

1. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?

   A. Kinematic viscosity B. Work C. Temperature D. None of these...

2. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

   A. TR/(T2 – TR) × (T1 – T2)/T1 B. TR/(T2 – TR) × T1/(T1 – T2) C. TR/(T1 – TR) × (T1 – T2)/T1 D. None of these...

3. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?

   A. 100,000 kW B. 160,000 kW C. 200,000 kW D. 320,000 kW...

4. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?

   A. T1/(T1-T2) B. T2/(T1-T2) C. T1/T2 D. T2/R1...

5. Which of the following has the minimum value of COP for a given refrigeration effect ?

   A. Reverse Carnot cycle B. Ordinary vapour-compression cycle C. Vapour-compression process with a reversible expansion engine D. Air refrigeration cycle...

6. Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance) ?

   A. Air cycle B. Carnot cycle C. Ordinary vapour compression cycle D. Vapour compression with a reversible expansion engine...

7. Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

   A. T2/(T1 – T2) B. T1/(T1 – T2) C. (T1 – T2)/T1 D. (T1 – T2)/T2...

8. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?

   A. Positive B. Negative C. Zero D. Infinity...

9. Out of the following refrigeration cycles, which one has maximum COP ?

   A. Air cycle B. Carnot cycle C. Ordinary vapor compression cycle D. Vapor compression with a reversible expansion engine...

10. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?

    A. Less pronounced B. More pronounced C. Equal D. Data insufficient, can’t be predicted...