Deck 37: Automatic Speed Control for Wound Rotor Motors

Question 1

Pilot control devices are often employed to control the operation of a wound rotor induction motor.

Answer 1

True

Question 2

The overload relay for a wound rotor motor contains two sets of contacts, both normally closed.

Answer 2

False

Question 3

Current transformers sense motor current and supply current to the .

A)float switches
B)overload heaters
C)speed control circuit
D)contactors

Answer 3

B

Question 4

A(n) indicates when power is supplied to the control circuit.

A)green pilot lamp
B)audible alarm
C)flashing LED
D)red warning lamp

Question 5

Four separate levers permit selection of the motor's operating speed.

Question 6

If the motor is operating and a lower speed is selected, it immediately decreases to the lower speed without time
delay.

Question 7

If the motor is operating at a low speed and a higher speed is selected, the motor immediately increases to the next higher speed if it has been operating in its present speed for more than .

A)3 seconds
B)30 seconds
C)1 minute
D)3 minutes

Question 8

The normally closed set of the overload relay is connected in parallel with float switch EFS and will active the red warning lamp and alarm in the event of .

A)a short
B)falling water levels
C)rising water levels
D)a motor overload