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What are the different temperatures at which thermostats fully opens for petrol and diesel engine respectively?

a) 106°C;120°C
b) 89°C;98°C
c) 82°C;90°C
d) 100°C;102°C

Answer: c
Explanation: The purpose of thermostat is to close the water passage, between cylinder head and the top of radiator, when the engine is cold so that water circulation is restricted causing the engine to reach operating temperature more quickly. Thermostats are designed to start opening at 70°C-75°C and the fully open at 82°C for petrol and 90°C for diesel engine.

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