Deck 22: Motor Control Circuits

Question 1

A thermostat is which type of control?

A) two-wire
C) H-O-A
B) three-wire
D) jog

Answer 1

C

Question 2

The type of control that will restart of a motor automatically when power is restored after a power failure is a ____.

A) two-wire control
C) four-wire control
B) three-wire control
D) five-wire control

Answer 2

A

Question 3

A motor may be controlled manually by a ____.

A) float switch
C) toggle switch
B) pressure switch
D) time clock

Answer 3

C

Question 4

Which of the following is not a starting method?

A) autotransformer
C) automatic three-point
B) wye-delta
D) plugging

Question 5

Three-wire controls need four wires to connect the control device into the circuit.

Question 6

A jog switch applies power to the motor as long as the switch is ____.

A) closed
C) toggled
B) open
D) shorted

Question 7

What type of control allows a circuit to function under the control of either an automatic device or manually?

Question 8

___________________ starting circuits are used for motors connected directly across the power lines, providing full voltage and current to the motor.

Question 9

A drum switch is a mechanically held device that allows the _____________________ of rotation of a motor to be changed.

Question 10

With a three-wire control system, the motor would not re-start in the event of a power interruption.

Question 11

Jogging is a type of motor control in which the motor may be ____________________ slightly.

Question 12

Why could it be a problem to start a motor in fast speed mode?

Question 13

Depressing the stop pushbutton in a forward/reverse circuit causes the motor to ____.

A) start
C) reverse direction
B) stop
D) slow

Question 14

____________________ is a method of braking a motor where the motor is brought to a rapid stop by forcing it to rotate in the opposite direction from the direction in which it was running.

Question 15

Dynamic braking involves the motor ____.

A) coasting to a stop
C) running in the opposite direction
B) sticking
D) generating power