Which of the following is an engine coolant property

Question

Question

This question was previously asked in

RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)

Answer 1

Explanation:

Engine Coolant:

An engine coolant (also called an antifreeze) is a special fluid that runs through your engine to keep it within its correct operating temperature range.
It is made from either ethylene glycol or propylene, water, some protection additives and is usually green, blue or even pink in colour.

Engine Coolant properties:

An efficient cooling system removes 30 to 35% of the heat generated in the combustion chamber.

Coolant should remove heat at a fast rate when the engine is hot.
Coolant should remove heat at a slow rate when the engine is started until the engine reaches its normal operating temperature.
Coolant should not remove too much heat from the engine. Too much removal of the heat decreases the thermal efficiency of the engine.
It should have a Low freezing point
It should have high thermal conductivity.
It should have high thermal stability.
It should have a high thermal specific heat
It should circulate freely in the coding system.
It should prevent frequency and rust formations.
It should be reasonably cheap.
It should not waste by vaporization.
It should not deposit any foreign matter in the water jackets/radiator.