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IC Engine MCQs | IC Engine Multiple Choice Questions with Answers

Questions
61 Which of the following is false statement : Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following
A piston ring and cylinder wear
B formation of hard coating on piston skirts
C oil sludge in the engine crank case
D detonation

Answer: detonation
62 The actual volume of fresh charge admitted in 4-stroke petrol engine is
A equal to stroke volume
B equal to stroke volume and clearance volume
C less than stroke volume
D more than stroke volume

Answer: less than stroke volume
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63 The magneto in an automobile is basically
A transformer
B d.c. generator
C capacitor
D magnetic circuit

Answer: d.c. generator
64 The reason for supercharging in any engine is to
A increase efficiency
B increase power
C reduce weight and bulk for a given out-put
D effect fuel economy

Answer: reduce weight and bulk for a given out-put
65 Supercharging is essential in
A diesel engines
B gas turbines
C petrol engines
D aircraft engines

Answer: aircraft engines
66 Flash point of fuel oil is
A minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B temperature at which it solidifies or congeals
C temperature at which it catches fire without external aid
D none of the above

Answer: minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
67 For the same power developed in I.C. engines, the cheaper system is
A naturally aspirated
B supercharged
C centrifugal pump
D turbo charger

Answer: supercharged
68 Scavenging is usually done to increase
A thermal efficiency
B speed
C power output
D fuel consumption

Answer: power output
69 The theoretically correct air fuel ratio for petrol engine is of the order of
A 6 : 1
B 9 : 1
C 12 : 1
D 15 : 1

Answer: 15 : 1
70 Air fuel ratio at which a petrol engine can not work is
A 8 : 1
B 10 : 1
C 15 : 1
D 20 : 1 and less

Answer: 20 : 1 and less

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