Question 485Motor Plants - Assistant Engineer

The correct answer is D) Excessive feedwater temperature. Explanation: Excessive feedwater temperature can cause the feed pump for an auxiliary boiler to lose suction. This is because as the feedwater temperature increases, the water's density decreases, making it more difficult for the pump to generate the necessary suction to draw the water into the boiler. The other options, such as increased suction head pressure (A), decreased feedwater temperature (B), or the pump recirculating line being open too much (C), would not lead to the feed pump losing suction.