Question

What is the purpose of the thermostat in an engine cooling system?

(a) To allow the engine to warm-up quickly

(b) To prevent the coolant from boiling

(c) To pressurize the system

(d) To indicate to the driver the coolant temperature

I had been asked this question in examination.

My question is from Heat Rejection and Cooling in chapter Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer 1

Correct answer is (a) To allow the engine to warm-up quickly

Easy explanation: The thermostat is used to allow the engine to warm-up quickly. The thermostat unit consists of closed bellows with a volatile liquid.