Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

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. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is__________________?

   A. Less B. More C. Same D. Dependent on climatic conditions...

3. 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 ?

   A. Vapor compression cycle using expansion valve B. Air refrigeration cycle C. Vapor compression cycle using expansion engine D. Carnot refrigeration cycle...

4. 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...

5. In a working refrigerator, the value of COP is always__________________?

   A. 0 B. < 0 C. < 1 D. > 1...

6. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?

   A. 0.5 B. 3.5 C. 4.5 D. 8.5...

7. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?

   A. 0 B. ∞ C. +ve D. -ve...

8. Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?

   A. Decreases B. Increases C. Remains constant D. Decreases logarithmically...

9. 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...

10. 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...