100% efficiency of a thermal cycle cannot be achieved because of __________________?

Related Mcqs:

1. The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?

   A. more
   B. less
   C. same
   D. more upto some load and then less
   E. it may be less or more depending on several other factors

2. Thermal efficiency of a thermal power plant is of the order of___________________?

   A. 15%
   B. 20%
   C. 30%
   D. 45%
   E. 60%.

3. Efficiency of a thermal cycle increases by ________________?

   A. regeneration
   B. reheating of steam
   C. both A. and B.
   D. cooling of steam
   E. none of the above

4. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?

   A. increase
   B. decrease
   C. remain unaffected
   D. increase/decrease depending upon engine capacity
   E. first increase and then decrease

5. The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio

   A. Higher
   B. Lower
   C. Equal
   D. None of these

   Submitted by: Faheem Zaman Dhaunroo

6. Thermal efficiency of well maintained boiler will be of the order___________________?

   A. 20%
   B. 40%
   C. 50%
   D. 75%
   E. 90%

7. The overall efficiency of thermal power plant is________________?

   A. boiler efficiency, turhine efficiecny, generator efficiency
   B. all the three above plus gas cycle efficiency
   C. carnot cycle efficiency
   D. regenerative cycle efficiency
   E. rankine cycle efficiency

8. Efficiency of rankine cycle can be increased by_________________?

   A. decreasing initial steam pressure and temperature
   B. increasing exhaust pressure
   C. decreasing exhaust pressure
   D. increasing the expansion ratio
   E. increasing number of regenerative heaters

9. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?

   A. higher
   B. lower
   C. same
   D. depends on size of engine
   E. unpredictable.

10. The thermal efficiency of a diesel engine is of the order of_________________?

    A. 92%
    B. 68%
    C. 52%
    D. 34%
    E. 25%.