Question 74Steam Plants - QMED

The correct answer is C. The "make-up valve" opens when the level in the main condenser hot well drops to a certain level and allows make-up water to be drawn out of the distilled water tank via vacuum drag into the main condenser. This is correct because the main condenser hot well is where the condensed steam from the turbine is collected. If the level in the hot well drops, the make-up valve opens to allow additional distilled water to be drawn in to maintain the proper water level in the condenser. The other options are incorrect because they do not accurately describe the function of the make-up valve in relation to the main condenser hot well level. The make-up valve does not open to pump excess water from the hot well or the deaerating feed tank to the distilled water tank.