Mechanical Engineering MCQs

Page No. 76

In a naturally aspirated diesel engine, the air is supplied by________________?


aa supercharger


ba centrifugal blower


ca vacuum chamber


dan injection tube


View Answer a vacuum chamber

In the crankcase method of scavenging, the air pressure is produced by_________________?


asupercharger


bcentrifugal pump


cnatural aspirator


dmovement of engine piston



In loop scavenging, the top of the piston is________________?


aflat


bcontoured


cslanted


ddepressed


View Answer contoured

A stoichiometric air-fuel ratio is______________________?


achemically correct mixture


blean mixture


crich mixture for idling


drich mixture for over loads



Which is more viscous lub oil_________________?


aSEA 30


bSAE 4£


cSAE 50


dSAE 80


View Answer SAE 80

The air-fuel ratio in petrol engines-is controlled by__________________?


acontrolling valve opening/closing


bgoverning


cinjection


dcarburettion


View Answer carburettion

Pour point of fuel oil is the_________________?


aminimum 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


btemperature at which it solidifies or congeals


cit catches fire without external aid


dindicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off



For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?


a9 : 1


b12 : 1


c15 : 1


d18 : 1


View Answer 12 : 1

Air fuel ratio for idling speed of a petrol engine is approximately_________________?


a1 : 1


b5 : 1


c10:1


d15 : 1


View Answer 10:1

Which of the following is the lightest and most volatile liquid fuel________________?


adiesel


bkerosene


cfuel oil


dgasoline


View Answer gasoline

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