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31. The advancing of spark timing in spark ignition engines will __________ knocking tendency.

A. increase
B. reduce
C. not effect

Show Answer

32. The knocking in spark ignition engines can be reduced by

A. retarding the spark
B. increasing the engine speed
C. both (a) and (b)
D. none of these

Show Answer

33. An atom bomb utilizes uncontrolled nuclear fission.

A. True
B. False

Show Answer

34. The ratio of the brake power to the indicated power is called

A. mechanical efficiency
B. overall efficiency
C. indicated thermal efficiency
D. volumetric efficiency

Show Answer

35. The increase of efficiency of a compression ignition engine, as the load decreases, is due to

A. higher maximum temperature
B. qualitative governing
C. quantitative governing
D. hit and miss governing

Show Answer

36. A turbo-jet does not require a turbine to drive the compressor.

A. True
B. False

Show Answer

37. For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.

A. less
B. more

Show Answer

38. The compression ratio in petrol engines is kept low as compared to diesel engines because higher compression ratio in petrol engines would lead to pre-ignition of fuel.

A. Agree
B. Disagree

Show Answer

39. The cetane (C₁₆H₃₄) which is a straight chain paraffin is assigned a cetane number of

A. 0
B. 50
C. 100
D. 120

Show Answer

40. Morse test is used to determine the I.P. of a

A. single cylinder petrol engine
B. four stroke engine
C. single cylinder diesel engine
D. multi-cylinder engine

Show Answer
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