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Mechanical Engineering Objective Questions { Internal Combustion Engines }



92. In the opposed piston diesel engine, the combustion chamber is located
A.Above the piston
B.Below the piston
C.Between the pistons
D.Anywhere

93. A-stoichiometric air-fuel ratio is
A.Chemically correct mixture
B.Lean mixture
C.Rich mixture for idling
D.Rich mixture for over loads

94. In a naturally aspirated diesel engine, the air is supplied by
A.A supercharger
B.A centrifugal blower
C.A vacuum chamber
D.An injection tube

95. In loop scavenging, the top of the piston is
A.Flat
B.Contoured
C.Slanted
D.Depressed

96. 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

97. In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be
A.Less than 100C
B.Between 100 - 250C
C.Between 250 - 300C
D.Between 400 - 500C

98. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be
A.Higher
B.Lower
C.Same
D.Depends on size of engine

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