Mechanical Engineering MCQs

Page No. 83

Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?


athe friction is high


bthe friction is unpredictable


cthe small difference in cooling water temperature or in internal friction has a disproportionate effect


dthe engine is rarely operated



A heat engine utilises the_________________?


acalorific value of oil


blow heat value of


chigh heat value of oil


dmean heat value of oil



The rating of a diesel engine, with increase in airintlet temperature, will ___________________?


aincrease linearly


bincrease linearly


cincrease parabolically


ddecrease parabolically


View Answer increase linearly

In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?


a250°C


b500°C


c1000°C


d150CPC


View Answer 1000°C

In a typical medium speed, 4-stroke cycle diesel engine ___________________?


afuelinjection starts at 10° before to dead center and ends at 20° after tor dead center


bfuel injection starts at top dead center and ends at 20° after top dead center


cfuel injection starts at just before top dead center and ends just after top deac center


dmay start and end anywhere



Which of the following medium is compressed in a Diesel engine cylinder __________________?


aair aione


bair and fuel


cair and lub oil


dfuel alone


View Answer air aione

Most high speed compression engines operate on __________________?


aDiesel cycle


bOtto cycle


cDual combustion cycle


dSpecial type of air cycle


View Answer Dual combustion cycle

As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?


apeak pressure


brate of rise of pressure


crate of rise of temperature


dpeak temperature



For the same compression ratio_____________________?


aOtto cycle is more efficient than the Diesel


bDiesel cycle is more efficient’than Otto


cboth Otto and Diesel cycles are, equally efficient


dcompression ratio has nothing to do with efficiency



It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?


aincrease


bdecrease


cremain same


dincrease upto certain limit and then decrease


View Answer increase

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