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

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

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

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

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