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Mechanical Engineering Objective Questions { Internal Combustion Engines }



43. The air-fuel ratio of the petrol engine is controlled by?
A.Fuel jump
B.Governor
C.Carburetor
D.Injector

44. In a typical medium speed, 4-stroke cycle diesel engine
A.Fuel injection starts at 10 before top dead centre and ends at 20 after top dead centre
B.Fuel injection starts at top dead centre and ends at 20 after top dead centre
C.Fuel injection starts at just before top dead centre and ends just after top dead centre
D.May start and end anywhere

45. Diesel fuel, compared to petrol is
A.Less difficult to ignite
B.Just about the same difficult to ignite
C.More difficult to ignite
D.Highly ignitable

46. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
A.250C
B.500C
C.1000C
D.1500C

47. When crude oil is heated, then which of the following hydrocarbon is given off first.
A.Kerosene
B.Natural gas
C.Paraffin
D.Diesel

48. The rating of a diesel engine, with increase in air-intlet temperature, will
A.Increase linearly
B.Decrease linearly
C.Increase parabolically
D.Decrease parabolically

49. A 75 cc engine has following parameter as 75 cc
A.Fuel tank capacity
B.Lub oil capacity
C.Swept volume
D.Cylinder volume

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