Mechanical Engineering MCQs

Page No. 82

For the same power developed in I.C. engines, the cheaper system is_____________?


anaturally aspirated

✖


bsupercharged

✓


ccentrifugal pump

✖


dturbo charger

✖


View Answer supercharged

Flash point of fuel oil is __________________?


aminimum temperature to which1 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

✖


ctemperature at which it catches fire without external aid

✖


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

✖



The operation of forcing additional air under pressure in the engine cylinder is known as________________?


ascavenging

✖


bturbulence

✖


csupercharging

✓


dpre-ignition

✖


View Answer supercharging

The magneto in an automobile is basically__________________?


atransformer

✖


bd.c. generator

✓


ccapacitor

✖


dmagnetic circuit

✖


View Answer d.c. generator

Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?


ausing additives in the fuel

✖


bengine derating i.e. reducing the maxi-mum flow of fuel

✖


cincreasing the compression ratio

✓


dadherence to proper fuel specification

✖



In a cycle, the spark lasts roughly for ____________________?


a1 sec

✖


b0.1 sec

✖


c0.01 sec

✖


d0.001 sec

✓


View Answer 0.001 sec

A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?


amore efficient

✓


bless efficient

✖


cequally efficient

✖


dunperdictable

✖


View Answer more efficient

Most high speed compression engines operate on ___________________?


aOtto cycle

✖


bDiesel cycle

✖


cDual cycle

✓


dCarnot cycle

✖


View Answer Dual cycle

The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?


a1500 rpm

✖


b750 rpm

✓


c3000 rpm

✖


dany value independent of engine speed

✖


View Answer 750 rpm

The term scavenging is generally associated with______________________?


a2-stroke cycle engines

✖


b4-stroke cycle engines

✖


caeroplane engines

✖


dhigh efficiency engines

✓



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