Mechanical Engineering MCQs

Page No. 50

For low load operation, more suitable (economical) engine is_______________?


aS.I. engine

✖


bC.I. engine

✓


cboth are equally good

✖


dmulticylinder engine

✖


View Answer C.I. engine

Hot air standard diesel cycle efficiency with increase in value of C„_______________?


aincreases

✖


bdecreases

✓


cremains unaffected

✖


ddepends on other factors

✖


View Answer decreases

Which of the following engines can work on very lean mixture__________________?


aS.I. engine

✖


bC.I. engine

✓


ctwo stroke engine

✖


dfour stroke engine

✖


View Answer C.I. engine

In open combustion chamber in diesel engines____________________?


athe shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture

✓


bfuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

✖


conly a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

✖


dfuel is injected at atmospheric pres¬sure

✖



In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?


aincrease the knocking tendency

✓


bdecrease the knocking tendency

✖


cnot affect the knocking tendency

✖


dincrease or decrease knocking tendency depending on strength and time of spark

✖



Theoretically, the following engine should have maximum efficiency________________?


agas engine

✖


b2-stroke S.I. engine

✖


c4-stroke S.I. engine

✖


d4-stroke C.I. engine

✓


View Answer 4-stroke C.I. engine

The thermal efficiency of a diesel engine is of the order of_________________?


a92%

✖


b68%

✖


c52%

✖


d34%

✓


View Answer 34%

The ignition coil in diesel engines produces voltage of the order of________________?


a6 to 12 volts

✖


b240 volts

✖


c1000 volts

✖


d20,000 volts

✓


View Answer 20,000 volts

In petrol engines, advancing the spark timing will_______________?


aincrease the knocking tendency

✓


bdecrease the knocking tendency

✖


cnot affect the knocking tendncy

✖


dincrease or decrease knocking tendency depending on strenght and time of spark

✖



The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?


aignition coil

✖


bignition coil and distributor

✓


cignition coil and condenser

✖


dignition coil and contact breaker

✖



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