Question 728Steam Plants - Assistant Engineer

The correct answer is C) vacuum. Gland sealing steam is used in steam turbine operation to prevent the loss of vacuum within the turbine casing. The turbine relies on maintaining a high vacuum to maximize efficiency and power output. The gland sealing steam creates a positive pressure seal around the turbine shaft, preventing air from being drawn into the turbine and disrupting the vacuum. This helps maintain the vacuum necessary for proper turbine operation. The other options are incorrect because they do not relate to the primary purpose of gland sealing steam. Preventing the loss of oil, air, or temperature are not the main functions of the gland sealing system in a steam turbine.