Question 1

In the absence of a discharge path when using the CEMF controller and dynamic braking, what damage would occur due to the high voltage?

Accepted Answer

The quick collapse of the magnetic field...

Question 2

Name two examples of special equipment that use motor reversal and dynamic braking operations.

Accepted Answer

Reversal of motors and dynamic...

Question 3

In a DC reversing motor, the forward and reverse buttons are mechanically interlocked so that it is not possible to operate these buttons at the same time.

Accepted Answer

A) True 
 B)False  True

Question 4

____________________ involves using a DC motor as a generator, taking it off the supply line and applying an energy dissipating resistor to the armature.

Accepted Answer

Dynamic braking

Question 5

When using the CEMF controller and dynamic braking, a field discharge resistor must be added.

Accepted Answer

A) True 
 B)False

Question 6

When the stop button is pressed, the dynamic braking contacts connect the dynamic braking resistor directly across the ____________________.

Accepted Answer

The answer of When the stop button is pressed, the...

Question 7

In a CEMF controller, braking action increases as the armature speed decreases.

Accepted Answer

A) True 
 B)False

Question 8

A field discharge resistor is a thyristor-type device that conducts when the voltage across it is high enough, but has a high resistance to normal line voltage.

Accepted Answer

A) True 
 B)False

Question 9

A DC motor is reversed by reversing the shunt field current.

Accepted Answer

A) True 
 B)False

Question 10

Due to the nature of the control circuit of the electrical and mechanical interlocking system, it is impossible for the reverse contacts to close until the ____________________ contacts are open.

Accepted Answer

The answer of Due to the nature of the control...

Question 11

What is the cause of the very large "inductive kick" voltage that occurs when using the CEMF controller and dynamic braking?

Accepted Answer

When the shunt field is disconnected fro...

Question 12

What is the purpose of dynamic braking?

Accepted Answer

The purpose of dynam...

Question 13

A generator converts ____________________ energy into electrical energy.

Accepted Answer

The answer of A generator converts ____________________ energy into electrical...

Question 14

Briefly describe what causes the armature to act as a generator in the process of dynamic braking.

Accepted Answer

As the armature is disconnected from the power source, a dynamic braking resistor is connected across the armature. The armature is still spinning and the shunt field is still energized, so the armature acts as a generator.

Question 15

One method of dynamic braking is to change the function of the motor to that of a(n) ____________________.

Accepted Answer

The answer of One method of dynamic braking is to...

Exam 8: The Dc Cemf Motor Controller and Dc Variable-Speed Motor Drives

In the absence of a discharge path when using the CEMF controller and dynamic braking, what damage would occur due to the high voltage?

Correct Answer
verified
The quick collapse of the magnetic field...
View Answer

Name two examples of special equipment that use motor reversal and dynamic braking operations.

Correct Answer
verified
Reversal of motors and dynamic...
View Answer

In a DC reversing motor, the forward and reverse buttons are mechanically interlocked so that it is not possible to operate these buttons at the same time.

Correct Answer
verified
True

____________________ involves using a DC motor as a generator, taking it off the supply line and applying an energy dissipating resistor to the armature.

Correct Answer
verified
Dynamic braking

When using the CEMF controller and dynamic braking, a field discharge resistor must be added.

Correct Answer
verified

When the stop button is pressed, the dynamic braking contacts connect the dynamic braking resistor directly across the ____________________.

Correct Answer
verified

In a CEMF controller, braking action increases as the armature speed decreases.

Correct Answer
verified

A field discharge resistor is a thyristor-type device that conducts when the voltage across it is high enough, but has a high resistance to normal line voltage.

Correct Answer
verified

A DC motor is reversed by reversing the shunt field current.

Correct Answer
verified

Due to the nature of the control circuit of the electrical and mechanical interlocking system, it is impossible for the reverse contacts to close until the ____________________ contacts are open.

Correct Answer
verified

What is the cause of the very large "inductive kick" voltage that occurs when using the CEMF controller and dynamic braking?

Correct Answer
verified
When the shunt field is disconnected fro...
View Answer

What is the purpose of dynamic braking?

Correct Answer
verified
The purpose of dynam...
View Answer

A generator converts ____________________ energy into electrical energy.

Correct Answer
verified

Briefly describe what causes the armature to act as a generator in the process of dynamic braking.

Correct Answer
verified
As the armature is disconnected from the power source, a dynamic braking resistor is connected across the armature. The armature is still spinning and the shunt field is still energized, so the armature acts as a generator.

One method of dynamic braking is to change the function of the motor to that of a(n) ____________________.

Correct Answer
verified

Exam 8: The Dc Cemf Motor Controller and Dc Variable-Speed Motor Drives

In the absence of a discharge path when using the CEMF controller and dynamic braking, what damage would occur due to the high voltage?

Correct AnswerverifiedThe quick collapse of the magnetic field...View AnswerShow Answer

Name two examples of special equipment that use motor reversal and dynamic braking operations.

Correct AnswerverifiedReversal of motors and dynamic...View AnswerShow Answer

In a DC reversing motor, the forward and reverse buttons are mechanically interlocked so that it is not possible to operate these buttons at the same time.

Correct AnswerverifiedTrue

____________________ involves using a DC motor as a generator, taking it off the supply line and applying an energy dissipating resistor to the armature.

Correct AnswerverifiedDynamic braking

When using the CEMF controller and dynamic braking, a field discharge resistor must be added.

Correct AnswerverifiedShow Answer

When the stop button is pressed, the dynamic braking contacts connect the dynamic braking resistor directly across the ____________________.

Correct AnswerverifiedShow Answer

In a CEMF controller, braking action increases as the armature speed decreases.

Correct AnswerverifiedShow Answer

A field discharge resistor is a thyristor-type device that conducts when the voltage across it is high enough, but has a high resistance to normal line voltage.

Correct AnswerverifiedShow Answer

A DC motor is reversed by reversing the shunt field current.

Correct AnswerverifiedShow Answer

Due to the nature of the control circuit of the electrical and mechanical interlocking system, it is impossible for the reverse contacts to close until the ____________________ contacts are open.

Correct AnswerverifiedShow Answer

What is the cause of the very large "inductive kick" voltage that occurs when using the CEMF controller and dynamic braking?

Correct AnswerverifiedWhen the shunt field is disconnected fro...View AnswerShow Answer

What is the purpose of dynamic braking?

Correct AnswerverifiedThe purpose of dynam...View AnswerShow Answer

A generator converts ____________________ energy into electrical energy.

Correct AnswerverifiedShow Answer

Briefly describe what causes the armature to act as a generator in the process of dynamic braking.

Correct AnswerverifiedAs the armature is disconnected from the power source, a dynamic braking resistor is connected across the armature. The armature is still spinning and the shunt field is still energized, so the armature acts as a generator.

One method of dynamic braking is to change the function of the motor to that of a(n) ____________________.

Correct AnswerverifiedShow Answer

Correct Answer
verified
The quick collapse of the magnetic field...
View Answer

Correct Answer
verified
Reversal of motors and dynamic...
View Answer

Correct Answer
verified
True

Correct Answer
verified
Dynamic braking

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
When the shunt field is disconnected fro...
View Answer

Correct Answer
verified
The purpose of dynam...
View Answer

Correct Answer
verified

Correct Answer
verified
As the armature is disconnected from the power source, a dynamic braking resistor is connected across the armature. The armature is still spinning and the shunt field is still energized, so the armature acts as a generator.

Correct Answer
verified