Mechanical Engineering MCQs

Page No. 48

Deposition of carbon in petrol engine cylinder would result in increase of__________________?


aclearance volume

✖


bswept volume

✖


ccompression ratio

✓


dvolumetric efficiency

✖


View Answer compression ratio

If petrol is used in a diesel engine, then______________?


ahigher knocking will occur

✓


befficiency will be low

✖


clow power will be produced

✖


dblack smoke will be produced

✖



In turbulence chamber in diesel engine__________________?


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

✖


dthere are no valves

✖



Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?


aSupercharged

✖


bNot supercharged

✓


cCharged

✖


dSupercharged provided its speed is low

✖


View Answer Not supercharged

A two stroke crank compressed engine has following ports in the cylinder_______________?


asuction port and exhaust port

✖


btransfer port only

✖


csuction port and transfer port

✖


dsuction port, exhaust port and transfer port

✓



A two stroke engine is usually identified by__________________?


asize of flywheel

✖


bweight of engine

✖


ctype of lubrication system

✖


dabsence of valves

✓


View Answer absence of valves

In the case of compression ignition engine, the %age of CO in exhaust gases is________________?


aZero

✓


b5-10%

✖


cDepends on load

✖


dConsiderable percent

✖


View Answer Zero

The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?


aincrease

✓


bdecrease

✖


cremain unaffected

✖


dincrease/decrease depending upon engine capacity

✖


View Answer increase

In precombustion chamber in diesel engine________________?


aThe shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of 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

✓


dThere are no valves

✖



In a diesel engine, injection pressure developed by injector is of the order of______________?


a10 kg/cm2

✖


b100 kg/cm2

✖


c500 kg/cm2

✖


d1400 kg/cm2

✓


View Answer 1400 kg/cm2

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