Question 125Steam Plants - QMED

The correct answer is C) the amount of cooling water to the condenser is insufficient. The back pressure trip on a ship's service turbo-generator is designed to protect the turbine from damage due to excessive back pressure. When the amount of cooling water to the condenser is insufficient, it can lead to a reduction in the rate of condensation, causing an increase in the back pressure in the turbine exhaust. This high back pressure can potentially damage the turbine, so the back pressure trip functions to automatically shut down the turbine in this circumstance. The other options are incorrect because they do not directly relate to the primary function of the back pressure trip, which is to protect the turbine from excessive back pressure caused by insufficient cooling water to the condenser.