Which instrument indicates revolutions per minute?

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Study for the MTA Electrical Test. Use our flashcards and multiple choice questions to prepare, each question includes hints and explanations. Achieve success on your exam!

Multiple Choice

Which instrument indicates revolutions per minute?

Explanation:
A tachometer displays the rotational speed, in revolutions per minute, of a shaft or motor. In electrical traction systems and similar equipment, monitoring RPM is essential for speed control, safe operation, and ensuring the motor doesn’t run beyond its limits. The other devices serve different roles: a synchroscope helps align AC sources by showing phase relationship for proper synchronization, a solenoid acts as an actuator to produce linear motion when energized, and a transformer changes voltage and current levels without indicating speed. So the instrument that indicates revolutions per minute is the tachometer.

A tachometer displays the rotational speed, in revolutions per minute, of a shaft or motor. In electrical traction systems and similar equipment, monitoring RPM is essential for speed control, safe operation, and ensuring the motor doesn’t run beyond its limits. The other devices serve different roles: a synchroscope helps align AC sources by showing phase relationship for proper synchronization, a solenoid acts as an actuator to produce linear motion when energized, and a transformer changes voltage and current levels without indicating speed. So the instrument that indicates revolutions per minute is the tachometer.

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