Question 81Motor Plants - QMED
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 higher freezing point and a lower boiling point
Bhas a lower freezing point and higher boiling point
Cprovides a constant pH below 7
Dprovides better vapor-phase cooling
AI Explanation
The correct answer is B) has a lower freezing point and higher boiling point. Ethylene glycol is commonly used as a coolant in closed cooling systems for diesel engines because it has a lower freezing point and higher boiling point compared to untreated raw water. This allows the coolant to effectively absorb and dissipate heat, preventing the cooling system from freezing in cold weather and boiling over in hot weather. The other options are incorrect because they do not accurately describe the key advantages of using ethylene glycol as a coolant over raw water.
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