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Internal Combustion Engines

Internal Combustion Engines
A mixture containing 65% of iso-octane and 35% of normal heptane will have

Cetane number 65
Octane number 35
Cetane number 35
Octane number 65

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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

252 cm3
286 cm3
248 cm3
264 cm3

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Internal Combustion Engines
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

Efficiency ratio
Relative efficiency
Overall efficiency
Net efficiency

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Internal Combustion Engines
High speed compression engines operate on

Otto cycle
Dual combustion cycle
Diesel cycle
All of these

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

2V₀ / (V₀ + V₁)
V₀ / (V₀ + V₁)
V₁ / (V₀ + V₁)
2V₁ / (V₀ + V₁)

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Internal Combustion Engines
The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

Very low
Very high
Low
High

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