Automobile Engineering in ME
The purpose of a thermostat in an engine cooling system is to

Prevent the coolant from boiling
Pressurise the system to raise the boiling point
Indicate the coolant temperature
Allow the engine to warm up quickly

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Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Approaching the T.D.C position on its exhaust stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke

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