Question

The type of transistor configuration that’s used with a DC servo motor is the

A. negative-logic configuration.

B. totem pole configuration.

C. H-bridge configuration.

D. emitter-follower configuration.

An inverter can be programmed to stop an AC motor quickly by enabling

A. an internal brake.

B. DC voltage injection to the motor.

C. a stationary AC waveform.

D. a reverse pulse action.

You’re looking at a tachometer feedback signal on an oscilloscope. The waveform takes a long time to go to zero volts. This means that the system is

A. reversing direction.

B. critically dampened.

C. overdampened.

D. at high speed.

You’re powering up a new motor in a brushless motor control system. After moving the shaft of the motor lightly left to right, the motor reverses direction and runs away. What’s the problem?

A. Power transistor failure

B. Reversed tachometer

C. Wrong motor type

D. Reversed hall-effect sensor

In a DC servo motor system, the tachometer feeds back a voltage that’s proportional to motor speed. Where does this voltage go to?

A. The axis logic card

B. The CPU in the main controller

C. The driver

D. The interpolator card

Answer 1