Question 723Steam Plants - Assistant Engineer

The correct answer is A) excessive steam leakage at the turbine glands. The failure of the gland leak off exhaust fan motor would result in a loss of airflow through the turbine glands, causing excessive steam leakage at the turbine glands. This is because the gland leak off exhaust fan is responsible for maintaining a negative pressure in the gland leak off system, which prevents steam from escaping the turbine glands. If the fan fails, the lack of airflow would allow steam to leak out, which would be one of the first indications of the fan failure. The other options are incorrect because they would not be the first indication of the gland leak off exhaust fan motor failure. Loss of vacuum, water knock, and increased turbine exhaust temperature would be secondary effects that would occur after the initial steam leakage.