Question

Which of the following types of electric motors are commonly used in electric tachometers?

1) DC motors
2) AC motors
3) Stepper motors
4) Servo motors

Answer 1

Electric tachometers commonly use DC motors.

Step-by-step explanation:

Electric tachometers commonly use DC motors to measure rotational speed. A DC motor consists of a loop of wire in a magnetic field, and when current is passed through the loop, it experiences torque and rotates a shaft. This rotational motion can be used to drive the tachometer.