Thermodynamics Multiple Choice Questions and Answers

21. The thermal efficiency of petrol engine is.......

   A.15%

   B.30%

   C.50%

   D.70%

22. The volumetric efficiency of a well designed engine may be.....

   A.30% to 40%

   B.40% to 60%

   C.60% to 70%

   D.75% to 90%

23. The break power of an engine is always......the indicated power

   A.Equal to

   B.Less than

   C.Greater than

   C.None of the above

24. The ratio of the indicated thermal efficiency to the air standard efficiency is called......

   A.Mechanical efficiency

   B.Overall efficiency

   C.Volumetric efficiency

   D.Relative efficiency

25. If the speed of the engine is increased,the indicated power will.......

   A.Increase

   B.Decrease

   C.Remain same

   D.None of the above

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