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IC Engines - Interview Questions and Answers

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91. 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.
Explanation:
92. A diesel engine has
A. 1 valve
B. 2 valves
C. 3 valves
D. 4 valves
E. no valve.
Explanation:
93. The knock in diesel engine occurs due to
A. instantaneous and rapid burning of the first part of the charge
B. instantaneous atuo iginition of last part of charge
C. delayed burning of the first part of the charge
D. reduction of delay period
E. all of the above.
Explanation:
94. Volatility of diesel fuel oil is
A. minimum temperature to which oil is heated in order to give off inflam�mable 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.
Explanation:
95. Which is more viscous lib oil
A. SEA 30
B. SAE 40
C. SAE 50
D. SAE 70
E. SAE 80.
Explanation:
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