What is a benefit of steam turbines over electric motors?

• A. Being able to control the speed and use when there is no power
• B. They are cheaper to install
• C. They require less maintenance
• D. They produce electricity directly without generators

Answer: (A)

Steam turbines provide direct mechanical power and can be started and run using steam, which means they can operate even when there isn’t electrical power available to drive a motor. You control a turbine’s speed by adjusting the steam flow and inlet conditions, giving flexible speed control under changing loads. Electric motors, by contrast, need an electrical power source to operate, so a loss or absence of power prevents starting or running them and makes speed depend on the electrical supply. The idea that a turbine produces electricity directly without a generator isn’t correct because a turbine alone doesn’t generate electricity; it drives a generator to do that.