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Internal Combustion Engines

Internal Combustion Engines
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed

120°C
80°C
180°C
240°C

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Internal Combustion Engines
The specific fuel consumption per B.P. hour for a diesel engine is about

0.25 kg
0.3 kg
0.2 kg
0.35 kg

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Internal Combustion Engines
The self ignition temperature of petrol is _________ as compared to diesel oil.

Lower
None of these
Higher
Same

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)
(V₀/V₁)/ [1 + (V₀/V₁)²]
V₁/(V₀ + V₁)

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Internal Combustion Engines
A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

248 cm3
286 cm3
252 cm3
264 cm3

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Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, napthene, aromatic
Napthene, aromatics, paraffin
Napthene, paraffin, aromatic
Paraffin, aromatic, napthene

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