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

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bthe friction is unpredictable

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

✓


dthe engine is rarely operated

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A heat engine utilises the_________________?


acalorific value of oil

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blow heat value of

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chigh heat value of oil

✓


dmean heat value of oil

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


aincrease linearly

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bincrease linearly

✓


cincrease parabolically

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ddecrease parabolically

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View Answer increase linearly

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


a250°C

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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

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

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dmay start and end anywhere

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


aair aione

✓


bair and fuel

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cair and lub oil

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dfuel alone

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View Answer air aione

Most high speed compression engines operate on __________________?


aDiesel cycle

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bOtto cycle

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cDual combustion cycle

✓


dSpecial type of air cycle

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View Answer Dual combustion cycle

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


apeak pressure

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brate of rise of pressure

✓


crate of rise of temperature

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dpeak temperature

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For the same compression ratio_____________________?


aOtto cycle is more efficient than the Diesel

✓


bDiesel cycle is more efficient’than Otto

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cboth Otto and Diesel cycles are, equally efficient

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dcompression ratio has nothing to do with efficiency

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


aincrease

✓


bdecrease

✖


cremain same

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dincrease upto certain limit and then decrease

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View Answer increase

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