Which of the following components is not typically used in the protection of the exhaust side of a steam turbine?

In the context of protecting the exhaust side of a steam turbine, a throttling valve is not commonly used. The main role of a throttling valve is to control the flow rate and pressure of steam entering or passing through a system, rather than providing protection from overpressure or other safety-related concerns.

On the exhaust side of a steam turbine, protection is primarily focused on preventing excessive pressure that could lead to equipment failure. The rupture disc is designed to act as a safety mechanism that bursts at a predetermined pressure, allowing for the venting of steam or gases and thereby providing an emergency relief measure. The safety valve also serves a critical function, automatically releasing pressure when it exceeds a certain level to protect the system from damage.

A pressure gauge is essential for monitoring the pressure levels within the exhaust system, enabling operators to detect any abnormal conditions that could pose a safety risk. Each of these components plays a significant role in ensuring the safe operation of a steam turbine, while the throttling valve's primary function does not align with the protective measures needed in this context.