Alternators in power stations driven by steam turbines are called turbo-alternators. Typical applications include electric motors, alternators and electric generators. A brushless alternator is composed of two alternators built end-to-end on one shaft. The alternators that use permanent magnets are specifically called magnetos. Electromagnetic generators fall into one of two broad categories, dynamos and alternators. Hz supplied by four 40 kVA engine-driven constant speed alternators. With advancement in semiconductor technology, brushless alternators are possible. Each of the four AC alternators produced 40,000 kVA. Each of the four AC alternators produced 40,000 KVA. It features two turbo alternators and two turbo blowers and remains in operation. Four diesel alternators rated at 350kW are provided for power generation. Redundancy is provided by dual batteries and alternators. The telharmonium used revolving electric alternators which generated tones that could be transmitted over wires. Hz turbo alternators and numbered 3 & 4. Larger vehicles may have salient pole alternators similar to larger machines.