Internal Combustion Engines
The reference fuels for knock rating of spark ignition engines would include

Normal heptane and iso-octane
Iso-octane and normal hexane
Normal octane and aniline
Iso-octane and alpha-methyl naphthalene

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Internal Combustion Engines
In a four stroke cycle petrol engine, the inlet valve

Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
May open or close anywhere
Opens at top dead center and closes at bottom dead center

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

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

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

None of these
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
Prevent sparking across the gap between the points
Both (A) and (B)

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