Internal Combustion Engines
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

75% diesel and 25% petrol
75% petrol and 25% diesel
75% normal heptane and 25% iso-octane
75% iso-octane and 25% normal heptane

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Internal Combustion Engines
Pour point of fuel oil is the

Temperature at which it solidifies or congeals
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
It catches fire without external aid
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Supplying compressed air to remove combustion products fully
Injecting excess fuel for raising more loads

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Temperature and pressure in the cylinder at the time of injection
Nature of the fuel mixture strength
All of these
Relative velocity between the fuel injection and air turbulence pressure of residual gases

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

To determine the information, which cannot be obtained by calculations
To satisfy the customer regarding the performance of the engine
To conform the data used in design, the validity of which may be doubtful
All of these

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