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IC Engines - Interview Questions and Answers

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71. 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.
Explanation:
72. In the opposed piston diesel engine, the combustion chamber is located
A. above the piston (/;) below the piston
B. between the pistons
C. any when
D. there is no such criterion.
E. opt 5
Explanation:
73. In the crankcase method of scavenging, the air pressure is produced by
A. supercharger
B. centrifugal pump
C. natural aspirator
D. movement of engine piston
E. reciprocating pump.
Explanation:
74. In loop scavenging, the top of the piston is
A. flat
B. contoured
C. slanted
D. depressed
E. convex shaped.
Explanation:
75. Scavenging is usually done to increase
A. thermal efficiency
B. speed
C. power output
D. fuel consumption
E. all of the above.
Explanation:
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