INTERNAL COMBUSTION ENGINES QUIZ

Gaseous fuel guarantees are based on

High heat value of oil

Low heat value of oil

Calorific value of oil

Mean heat value of oil

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The scavenging efficiency of a four stroke cycle diesel engine is

Between 85 and 95%

Below 50%

Between 50 and 85%

Between 95 and 100%

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Stoichiometric ratio is

Chemically correct air-fuel ratio by volume

Chemically correct air-fuel ratio by weight

None of these

Actual air-fuel ratio for maximum efficiency

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In diesel engine, the compression ratio in comparison to expansion ratio is

Less

Same

More

Variable

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A supercharged engine as compared to an ordinary engine

All of these

Requires smaller foundation

Consumes less lubricating oil

Is lighter

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The basic requirement of a good combustion chamber is

Minimum turbulence

Low volumetric efficiency

Low compression ratio

High thermal efficiency and power output

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Supercharging is essential in

Diesel engines

Petrol engines

Aircraft engines

Gas turbines

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The two reference fuels used for cetane rating are

Cetane and tetra ethyl lead

Cetane and normal heptane

Cetane and iso-octane

Cetane and alpha-methyl naphthalene

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The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)

P = [(W - S) πDN]/60 watts

P = (Wl × 2πN)/60 watts

P = [(W - S) π (D + d) N]/60 watts

All of these

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The voltage required to produce a spark across the gap, between the sparking points is

6000 to 10,000 volts

2000 to 4000 volts

4000 to 6000 volts

10,000 to 12,000 volts

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