Basic I.C. Engines interview questions and answers

71.    A diesel engine as compared to petrol engine (both running ar rated load) is
(a)    more efficient
(b)    less efficient
(c)    equally efficient
(d)    unpredictable
(e)    other factors will decide it.
Ans: a

72.  The size of inlet valve of.an engine in comparison to exhaust valve is
(a)     more
(b)     less
(c)    same
(d)    more/less depending on capacity of engine
(e)    varies from design to design.
Ans: b

74.    In a cycle, the spark lasts roughly for
(a) 1 sec
(b) 0.1 sec
(c) 0.01 sec
(d) 0.001 sec
(e) 0.0001 sec.
Ans: d

75.    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
(e)    forms corrosive acids.
Ans: d

76.    Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows
(a)    using additives in the fuel
(b)    engine derating i.e. reducing the maxi-mum flow of fuel
(c)    increasing the compression ratio
(d)    adherence to proper fuel specification
(e)    avoidance of overloading.
Ans: c

77.    The fuel air ratio in a petrol engine fitted with suction carburetor, operating with dirty air filter as compared to clean filter will be
(a)     higher
(b)     lower
(c)    remain unaffected
(d)    unpredictable
(e)     none of the above.
Ans: a

78.    Pick up the wrong statement about supercharging
(a)     supercharging reduces knocking in diesel engines
(b)     there can be limited supercharging in petrol engines because of detonation
(c)    supercharging at high altitudes is essential
(d)    supercharging results in fuel economy
(e)    supercharging is essential in aircraft engines.
Ans: d

79.    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
(e)    more than cylinder volume.
Ans: c

80.    The magneto in an automobile is basically
(c) transformer  
(b) d.c. generator
(c) capacitor
(d) magnetic circuit
(e) a.c. generator.
Ans: b

Read More Questions:
I.C. Engines - Mechanical MCQs part1
I.C. Engines - Mechanical MCQs part2
I.C. Engines - Mechanical MCQs part3
I.C. Engines - Mechanical MCQs part4
I.C. Engines - Mechanical MCQs part5
I.C. Engines - Mechanical MCQs part6
I.C. Engines - Mechanical MCQs part7
I.C. Engines - Mechanical MCQs part8
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I.C. Engines - Mechanical MCQs part10
I.C. Engines - Mechanical MCQs part11