Question 692Steam Plants - Assistant Engineer

70% to pass

In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct?

AThe cooling water discharge leaving the cooler is directly regulated.

BThe quantity of lube oil to the cooler is regulated.

CThe cooling water to the lube oil cooler is directly regulated to maintain the proper lube oil temperature.

DThe lube oil velocity from the cooler is regulated.

AI Explanation

The correct answer is A) The cooling water discharge leaving the cooler is directly regulated. When an automatic bypass valve is not provided, the cooling water discharge leaving the lube oil cooler must be directly regulated to maintain the required lube oil temperature. This is because the cooling water flow rate determines the amount of heat removed from the lube oil, and adjusting the discharge flow can help control the lube oil temperature. The other options are incorrect because regulating the lube oil quantity, the cooling water to the cooler, or the lube oil velocity would not be the primary method of maintaining the proper lube oil temperature in the absence of an automatic bypass valve.

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