Question 1

A mechanical interlocking device is assembled at the factory ________the forward and reverse contactors.

Accepted Answer

A)  on top of
B)  below
C)  between
D)  adjacent to C

Question 2

The term interlocking is used generally when referring to motor controllers and control stations that are ____________to provide control of production operations.

Accepted Answer

A)  fixated
B)  interconnected
C)  connected
D)  programmed B

Question 3

Reversing starters are available in ___________construction.

Accepted Answer

A)  horizontal and vertical
B)  parallel and series
C)  mechanical
D)  power-coil A

Question 4

If magnetic control devices are to be used, then reversing_________ accomplish the reversal of the motor direction.

Accepted Answer

A)  transformers
B)  transducers
C)  rotators
D)  starters

Question 5

Electrical interlocks are usually mounted on the side of a motor starter.

Accepted Answer

A) True 
 B)False

Question 6

NEMA specifications call for a starter to be derated.

Accepted Answer

A) True 
 B)False

Question 7

The direction of rotation of three-phase motors can be reversed by interchanging any two-motor leads to the line.

Accepted Answer

A) True 
 B)False

Question 8

Push-button interlocking is an electrical method of preventing both starter coils from being de-energized simultaneously.

Accepted Answer

A) True 
 B)False

Question 9

To reverse the direction of rotation of single-phase motors, both the starting and running winding motor leads are interchanged.

Accepted Answer

A) True 
 B)False

Question 10

Reversing starters consisting of mechanical and electrical interlocked devices are preferred for________ .

Accepted Answer

A)  easier maintenance
B)  maximum safety
C)  easier operation
D)  economic reasons

Exam 21: Interlocking Methods for Reversing Control

A mechanical interlocking device is assembled at the factory ________the forward and reverse contactors.

The term interlocking is used generally when referring to motor controllers and control stations that are ____________to provide control of production operations.

Reversing starters are available in ___________construction.

If magnetic control devices are to be used, then reversing_________ accomplish the reversal of the motor direction.

Electrical interlocks are usually mounted on the side of a motor starter.

NEMA specifications call for a starter to be derated.

The direction of rotation of three-phase motors can be reversed by interchanging any two-motor leads to the line.

Push-button interlocking is an electrical method of preventing both starter coils from being de-energized simultaneously.

To reverse the direction of rotation of single-phase motors, both the starting and running winding motor leads are interchanged.

Reversing starters consisting of mechanical and electrical interlocked devices are preferred for________ .