Question 732Steam Plants - Assistant Engineer

The correct answer is B) piston "F" moves downward to close the exhaust valve and open the steam makeup valve. In the event of a failure of bellows "I", the piston "F" will move downward to close the exhaust valve and open the steam makeup valve. This action is necessary to maintain the proper steam pressure in the system by allowing makeup steam to enter and compensate for the loss of pressure due to the bellows failure. The other options are incorrect because they do not accurately describe the proper response to a bellows failure. Option A would result in the opposite action, opening the exhaust valve and closing the makeup valve, which would further reduce the system pressure. Options C and D describe the piston moving upward, which is the incorrect direction for the given failure scenario.