Question 370Motor Plants - Assistant Engineer70% to pass
In a diesel engine closed fresh water cooling system, the cooling water pressure drop through the engine is 10 psig, and the pressure drop through the heat exchanger is 4 psig at maximum flow rates. The cooling water pump must produce a discharge head of at least_______________.
AI Explanation
The correct answer is C) 15 psig.
The cooling water pump must produce a discharge head that is equal to the sum of the pressure drops through the engine (10 psig) and the heat exchanger (4 psig), which is 10 psig + 4 psig = 14 psig. Rounding this up to the nearest whole number gives 15 psig as the minimum discharge head required for the cooling water pump.
The other options are incorrect because:
A) 4 psig is not sufficient to overcome the total pressure drop in the system.
B) 6 psig is also not enough to overcome the total pressure drop.
D) 28.7 psig is more than the required discharge head.
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