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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