Which of the following has the least thermal efficiency ?

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. 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

3. Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?

   A. 25
   B. 45
   C. 65
   D. 20

4. Which of the following liquid metals has the highest thermal conductivity ?

   A. Molten sodium
   B. Molten lead
   C. Mercury
   D. Molten potassium

5. 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

6. 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

7. With increase in compression ratio, the efficiency of the otto engine________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. Increases linearly

8. 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

9. 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

10. Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

    A. Temperature
    B. Nature of solute
    C. Pressure
    D. Nature of solvent