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__________________?

Related Mcqs:

1. 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

2. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?

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

3. 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

4. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?

   A. Two temperatures only
   B. Pressure of working fluid
   C. Mass of the working fluid
   D. Mass and pressure both of the working fluid

5. 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

6. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?

   A. Cold reservoir approaches zero
   B. Hot reservoir approaches infinity
   C. Either A. or B
   D. Neither A. nor B

7. 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

8. The equilibrium constant for a chemical reaction at two different temperatures is given by__________________?

   A. Kp2/Kp1 = – (ΔH/R) (1/T2 – 1/T1)
   B. Kp2/Kp1 = (ΔH/R) (1/T2 – 1/T1)
   C. Kp2/Kp1 = ΔH (1/T2 – 1/T1)
   D. Kp2/Kp1 = – (1/R) (1/T2 – 1/T1)

9. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be________________?

   A. 5.2
   B. 6.2
   C. 0.168
   D. Data insufficient, can’t be found out

10. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be _______________?

    A. More
    B. Less
    C. Same
    D. Data insufficient to predict