The safety device provided on a turbo generator which closes the throttle automatically when the cooling water to the condenser is insufficient is called a/an __________.

Correct Answer: Option B — back pressure trip

A back pressure trip safeguards the turbo generator by monitoring exhaust pressure. If main condenser cooling water is insufficient, exhaust pressure rises abnormally, triggering the back pressure trip to shut the steam throttle and prevent overpressurization.