Deck 15: Forward-Reverse Control, Jogging and Inching

Question 1

The term inching actually means to start a motor with short jabs of power at full voltage.

Answer 1

False

Question 2

The term jogging means to start a motor with short jabs of power at reduced voltage.

Answer 2

False

Question 3

The addition of a(n) ____ to the jog circuit eliminates the problem of the holding contacts making connection before the normally closed section of the jog push button reconnects.

A) control relay
B) flow switch
C) varistor
D) M coil

Answer 3

control relay

Question 4

A(n) ____________________ switch can be employed to provide jogging. The switch is used to break the connection to the holding contacts.

Question 5

____________________ can be used to reduce the amount of voltage applied to the motor during inching, or reactors or resistors can be connected in series with the motor to reduce the current supplied by the power line.

Question 6

Why are the terms jogging and inching often used interchangeably?

Question 7

How do jogging circuits work?

Question 8

If only one motor is in operation, only one overload relay is needed to protect the motor.

Question 9

Because the motor is connected to the power line regardless of which direction it operates, ____ contactor(s) is (are) needed for each direction.

A) two
B) the same
C) no
D) a separate

Question 10

True reversing controllers contain two separate contactors and _____ overload relay(s).

A) zero
B) one
C) two
D) three

Question 11

____________________ prevents some action from taking place until some other action has been performed.

Question 12

Most reversing controllers contain ____________________ interlocks as well as electrical interlocks.

Question 13

What are the two methods of electrical interlocking?

Question 14

How can you reverse the direction of rotation of a single-phase split-phase motor?