What is the purpose of a governor?

• A. To control speed by monitoring speed and adjusting throttle valve
• B. To measure exhaust gas temperature
• C. To lubricate turbine bearings
• D. To convert steam energy to electrical energy

Answer: (A)

The function being tested is keeping the machine running at a steady, intended speed. A governor does this by continuously sensing the actual rotational speed and then adjusting the throttle valve (or fuel flow) to bring the speed back to the desired set point. If load on the turbine or engine increases and speed tends to drop, the governor opens the throttle or increases fuel to raise speed. If the load drops and speed tends to rise, it reduces fuel or closes the throttle to bring speed back down. This control keeps the system stable, prevents overspeed, and helps maintain consistent performance and safety.

Exhaust gas temperature measurement isn’t the governor’s job; it’s about monitoring combustion conditions. Lubricating turbine bearings is part of the lubrication system, not speed control. Converting steam energy to electrical energy describes the turbine-generator action, not how speed is regulated.