INTERNAL COMBUSTION ENGINES QUIZ

The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

None of the listed here

Higher

Lower

Remain unaffected

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If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

V₁ / (V₀ + V₁)

2V₀ / (V₀ + V₁)

V₀ / (V₀ + V₁)

2V₁ / (V₀ + V₁)

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In order to eliminate knocking in compression ignition engines, there should be

Low compression ratio

Late auto-ignition

Short delay period

High self ignition temperature of fuel

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Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows

Increasing the compression ratio

Adherence to proper fuel specification

Using additives in the fuel

Avoidance of overloading

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Air fuel ratio at which a petrol engine cannot work is

0.62569444444444

0.41736111111111

20 : 1 and less

0.33402777777778

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Compression ratio of I.C. Engines is

Ratio of pressure after compression and before compression

Swept volume/cylinder volume

Volume displaced by piston per stroke and clearance volume in cylinder

The ratio of volumes of air in cylinder before compression stroke and after compression stroke

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In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

Decrease

Not effected

Increase

None of these

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The two reference fuels used for cetane rating are

Cetane and normal heptane

Cetane and iso-octane

Cetane and tetra ethyl lead

Cetane and alpha-methyl naphthalene

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The cetane number of diesel oil, generally available, is

30 to 40

25 to 30

20 to 25

40 to 55

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Most high speed compression engines operate on

Otto cycle

Dual combustion cycle

Special type of air cycle

Diesel cycle

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