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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