Question 440Motor Plants - Assistant Engineer
70% to passEthylene glycol, when used as a coolant in a closed cooling system for a diesel engine, is more advantageous than untreated raw water because it _______________.
Ahas a lower freezing point and higher boiling point
Bprovides a constant pH below 7
Cprovides better vapor-phase cooling
Dhas a higher freezing point and a lower boiling point
AI Explanation
The correct answer is A) has a lower freezing point and higher boiling point. Ethylene glycol is a common coolant used in closed cooling systems for diesel engines because it has a lower freezing point and higher boiling point compared to raw water. This allows the coolant to effectively circulate and absorb heat from the engine without freezing in cold conditions or boiling off in hot conditions. The other answer choices are incorrect because they do not accurately describe the key advantages of using ethylene glycol over raw water in a closed cooling system.
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