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