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Answer: c
Explanation: The engine driven generators are driven by the different forms of internal combustion engine. These generators have higher speeds for higher power ratings. These generators have speed of 1500 rpm.
The speed of engine-driven generators varies widely depending on their design, application, and power generation capacity. Generally, these generators are connected to engines that operate at a constant speed to ensure the generator produces electricity at a stable frequency. For example, in many parts of the world, generators are designed to produce electricity at a frequency of 50 Hz, while in other parts, a frequency of 60 Hz is standard.
To achieve a stable frequency of 50 Hz, the engine driving the generator typically operates at a speed of 1,500 revolutions per minute (rpm) for a 4-pole generator, and to produce electricity at 60 Hz, the engine speed is usually 1,800 rpm for a 4-pole generator. It’s worth noting that these speeds are for synchronous generators, which are a common type among engine-driven generators.
Variable speed generators and those with different numbers of poles can operate at different speeds. For instance, a 2-pole generator needs to run at 3,000 rpm to generate electricity at 50 Hz and 3,600 rpm for 60 Hz.
For small, portable generators or those used in specific applications, engine speeds can vary significantly, but the principles of matching engine speed to desired electricity frequency remain the same.