Discussion
Which of the following motor can be best choice for signaling and timing devices?
Answer: D
A reluctance motor is the best choice for signalling and timing devices. It runs at constant synchronous speed, has a simple rotor with no winding, and does not need DC excitation, which suits clocks, timers and signalling.
A DC series motor and a DC compound motor change speed with load and are used where high torque is needed, and a synchronous motor with DC excitation is used for larger power. So the fourth option is correct.
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