Mechanical Engineering MCQs

Page No. 78

Engine pistons ‘are usually made of aluminium alloy because it_________________?


ais lighter

✓


bwears less

✖


cabsorbs shocks

✖


dis stronger

✖


View Answer is lighter

In diesel engine, the compression ratio in comparison to expansion ratio is_______________?


asame

✖


bless

✖


cmore

✓


dvariable

✖


View Answer more

Polymerisation is a chemical process in which molecules of a compound become________________?


alarger

✓


bslowed down

✖


csmaller

✖


dliquid

✖


View Answer larger

Gaseous-fuel guarantees are based on___________________?


acalorific value of oil

✖


blow heat value of oil

✓


chigh heat value of oil

✖


dmean heat value of oil

✖


View Answer low heat value of oil

A 75 cc engine has following parameter as 75 cc ___________________?


afuel tank capacity

✖


blub oil capacity

✖


cswept volume

✓


dcylinder volume

✖


View Answer swept volume

When crude oil is heated, then which of the following hydrocarbon is given off first______________?


akerosene

✖


bgasoline

✖


cparaffin

✖


dnatural gas

✓


View Answer natural gas

Diesel fuel, compared to petrol is_________________?


aless difficult to ignite

✖


bjust about the same difficult to ignite

✖


cmore difficult to ignite

✓


dhighly ignitable

✖



The air-fuel ratio of the petrol engine is controlled by__________________?


afuel pump

✖


bgovernor

✖


cinjector

✖


dcarburettor

✓


View Answer carburettor

The accunmulation of carbon in a cylinder results in increase of________________?


aclearance volume

✖


bvolumetric efficiency

✖


cignition time

✖


deffective compression ratio

✓



The precess of breaking up or a lipuid into fine droplets by spraying is called___________________?


avaporisation

✖


bcarburetion

✖


cionisation

✖


datomisation

✓


View Answer atomisation

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