Questions on I.C. Engines - Mechanical Engineering Multiple choice Questions and Answers pdf

91.    Which of the following is the lightest and most volatile liquid fuel
(a) diesel 
(b) kerosene
(c) fuel oil 
(d) gasoline
(e) lub oil.
Ans: d

92.    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
(e) 20 : 1.
Ans: d

93.    Air fuel ratio for idling speed of a petrol engine is approximately
(a) 1 : 1 
(b) 5 : 1
(c) 10:1 
(d) 15 : 1
(e) 20 : 1.
Ans: c

94.    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
(e) will work at all ratios.
Ans: d

95.    For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of
(a) 9 : 1 
(b) 12 : 1
(c) 15 : 1 
(d) 18 : 1
(e) 20: 1.
Ans: b

96.    The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
(a) 1 m3 
(b) 5 m3
(c) 5-6 m3 
(d) 9-10 m3
(e) 15-18 m3.
Ans: d

97.    Pour point of fuel oil is the
(a)    minimum temperature to which 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)    it catches fire without external aid
(d)    indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
(e)    temperature at which it flows easily.
Ans: b

98.    A 5 BHP engine running at full load would consume diesel of the order of
(a) 0.3 kg/hr 
(b) 1 kg/hr
(c) 3 kg/hr 
(d) 5 kg/hr
(e) 10 kg/hr.
Ans: b

99.    Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided
(a)    it is properly designed
(b)    best quality fuel is used
(c)    can not work as it is impossible
(d)    flywheel size is proper
(e)    engine cooling is stopped.
Ans: c

100.    A diesel engine has
(a)    1 valve 
(b)     2 valves
(b)    3 valves 
(d)     4 valves
(e)     no valve.
Ans: c

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