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Mechanical Engineering Objective Questions { Internal Combustion Engines }



29. Which of the following is not an internal combustion engine
A.2-stroke petrol engine
B.Steam turbine
C.Diesel engine
D.Gas turbine

30. Pick up the false statement
A.Thermal efficiency of diesel engine is about 34%
B.Theoretically correct mixture of air and petrol is approx 15 : 1
C.Diesel engines are compression ignition engines
D.S.I. engines are quality governed engines

31. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the
A.Exhaust will be smoky
B.Scavenging occurs
C.Exhaust temperature will be high
D.Engine starts overheating

32. The output of a diesel engine can be increased without increasing the engine revolution or size in following way
A.Feeding more fuel
B.Supercharging
C.Heating incoming air
D.Scavenging

33. If the temperature of intake air in IC engines is lowered, then its efficiency will
A.Increase
B.Decrease
C.Remain same
D.Increase upto certain limit and then decrease

34. In a typical medium speed 4-stroke cycle diesel engine
A.Compression starts at 35 after bottom dead centre and ends at top dead centre
B.Compression starts at bottom dead centre and ends at top dead centre
C.Compression starts at 10 before bottom dead centre and ends just before top dead centre
D.May start and end anywhere

35. For the same compression ratio
A.Otto cycle is more efficient than the Diesel
B.Diesel cycle is more efficient than Otto
C.Both Otto and Diesel cycles are equally efficient
D.Which is more efficient would depend on engine capacity

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