Why do engines need to be cooled?

Question

RRB Paper · Accepted Answer

Whenever the engine is started from cold, the coolant temperature has to be brought to the desired level in order to minimize the warm-up time as to avoid pre-ignition and knocking. This purpose is achieved by a thermostat fitted in a system that initially prevents the circulation of water below a certain temperature through the radiator so that the water gets heated up quickly. When the spark is advanced, burning gas is compressed by the rising piston and therefore temperature and pressure are increased, thus, the tendency to knock increases. Pre-ignition is a situation in which the fuel-air mixture in a spark-ignition engine ignites before the timed spark, because of contact with a hot surface. When the preset temperature is reached, the thermostat allows the water to flow through the radiator.

Why do engines need to be cooled?

To regulate mass transfer

To improve compression volume

To reduce ignition temperature

To avoid pre-ignition and knocking

The correct answer is `No. 4: To avoid pre-ignition and knocking`

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Why do engines need to be cooled?

To regulate mass transfer

To improve compression volume

To reduce ignition temperature

To avoid pre-ignition and knocking

The correct answer is No. 4: To avoid pre-ignition and knocking

The correct answer is `No. 4: To avoid pre-ignition and knocking`