Question 1

How can the speed on a three phase induction motor be controlled?

Accepted Answer

The speed of a three phase induction mot...

Question 2

How do most variable frequency drives operate?

Accepted Answer

Most variable frequency drives...

Question 3

Alternators are often used to control the speed of several induction motors that require different changes in speed.

Accepted Answer

A) True 
 B)False

Question 4

Inverter rated motors are specifically designed to be operated by variable frequency drives.

Accepted Answer

A) True 
 B)False

Question 5

Drives using Insulated Gate Bipolar Transistors (IGBTs) generally used ____________________ to rectify the AC voltage into DC.

Accepted Answer

The answer of Drives using Insulated Gate Bipolar Transistors (IGBTs)...

Question 6

Many transistor controlled variable frequency drives now employ a special type of transistor called a(n) ______________________________.

Accepted Answer

IGBT
Insulated Gate ...

Question 7

When bipolar junction transistors are employed as switches, they are generally driven into ____________________ by supplying them with an excessive amount of base-emitter current.

Accepted Answer

saturation

Question 8

What are thyristors?

Accepted Answer

Thyristors are solid-state dev...

Question 9

The Insulated Gate Bipolar Transistor (IGBT) is a current controlled device, not a voltage controlled device.

Accepted Answer

A) True 
 B)False

Question 10

The output frequency of the alternator is determined by the speed of the ____________________.

Accepted Answer

The answer of The output frequency of the alternator is...

Question 11

What are two basic methods of achieving variable frequency?

Accepted Answer

Two basic methods of...

Question 12

Changing frequency causes a corresponding change in the inductive reactance of the windings.

Accepted Answer

A) True 
 B)False

Question 13

What is an advantage of using Insulated Gate Bipolar Transistors (IGBTs) for drives?

Accepted Answer

A great advantage of drives using IGBTs is the fact that SCRs are generally not used in the power supply and this greatly reduces problems with line harmonics.

Question 14

Ramping permits the motor to bring the load up to speed slowly as opposed to simply connecting the motor directly to the line.

Accepted Answer

A) True 
 B)False

Question 15

Variable frequency drives intended to control the speed of motors up to 500 hp generally use ____________________.

Accepted Answer

transistors

Exam 36: Variable Frequency Control

How can the speed on a three phase induction motor be controlled?

Correct Answer
verified
The speed of a three phase induction mot...
View Answer

How do most variable frequency drives operate?

Correct Answer
verified
Most variable frequency drives...
View Answer

Alternators are often used to control the speed of several induction motors that require different changes in speed.

Correct Answer
verified

Inverter rated motors are specifically designed to be operated by variable frequency drives.

Correct Answer
verified

Drives using Insulated Gate Bipolar Transistors (IGBTs) generally used ____________________ to rectify the AC voltage into DC.

Correct Answer
verified

Many transistor controlled variable frequency drives now employ a special type of transistor called a(n) ______________________________.

Correct Answer
verified
IGBT
Insulated Gate ...
View Answer

When bipolar junction transistors are employed as switches, they are generally driven into ____________________ by supplying them with an excessive amount of base-emitter current.

Correct Answer
verified
saturation

What are thyristors?

Correct Answer
verified
Thyristors are solid-state dev...
View Answer

The Insulated Gate Bipolar Transistor (IGBT) is a current controlled device, not a voltage controlled device.

Correct Answer
verified

The output frequency of the alternator is determined by the speed of the ____________________.

Correct Answer
verified

What are two basic methods of achieving variable frequency?

Correct Answer
verified
Two basic methods of...
View Answer

Changing frequency causes a corresponding change in the inductive reactance of the windings.

Correct Answer
verified

What is an advantage of using Insulated Gate Bipolar Transistors (IGBTs) for drives?

Correct Answer
verified
A great advantage of drives using IGBTs is the fact that SCRs are generally not used in the power supply and this greatly reduces problems with line harmonics.

Ramping permits the motor to bring the load up to speed slowly as opposed to simply connecting the motor directly to the line.

Correct Answer
verified

Variable frequency drives intended to control the speed of motors up to 500 hp generally use ____________________.

Correct Answer
verified
transistors

Exam 36: Variable Frequency Control

How can the speed on a three phase induction motor be controlled?

Correct AnswerverifiedThe speed of a three phase induction mot...View AnswerShow Answer

How do most variable frequency drives operate?

Correct AnswerverifiedMost variable frequency drives...View AnswerShow Answer

Alternators are often used to control the speed of several induction motors that require different changes in speed.

Correct AnswerverifiedShow Answer

Inverter rated motors are specifically designed to be operated by variable frequency drives.

Correct AnswerverifiedShow Answer

Drives using Insulated Gate Bipolar Transistors (IGBTs) generally used ____________________ to rectify the AC voltage into DC.

Correct AnswerverifiedShow Answer

Many transistor controlled variable frequency drives now employ a special type of transistor called a(n) ______________________________.

Correct AnswerverifiedIGBTInsulated Gate ...View AnswerShow Answer

When bipolar junction transistors are employed as switches, they are generally driven into ____________________ by supplying them with an excessive amount of base-emitter current.

Correct Answerverifiedsaturation

What are thyristors?

Correct AnswerverifiedThyristors are solid-state dev...View AnswerShow Answer

The Insulated Gate Bipolar Transistor (IGBT) is a current controlled device, not a voltage controlled device.

Correct AnswerverifiedShow Answer

The output frequency of the alternator is determined by the speed of the ____________________.

Correct AnswerverifiedShow Answer

What are two basic methods of achieving variable frequency?

Correct AnswerverifiedTwo basic methods of...View AnswerShow Answer

Changing frequency causes a corresponding change in the inductive reactance of the windings.

Correct AnswerverifiedShow Answer

What is an advantage of using Insulated Gate Bipolar Transistors (IGBTs) for drives?

Correct AnswerverifiedA great advantage of drives using IGBTs is the fact that SCRs are generally not used in the power supply and this greatly reduces problems with line harmonics.

Ramping permits the motor to bring the load up to speed slowly as opposed to simply connecting the motor directly to the line.

Correct AnswerverifiedShow Answer

Variable frequency drives intended to control the speed of motors up to 500 hp generally use ____________________.

Correct Answerverifiedtransistors

Correct Answer
verified
The speed of a three phase induction mot...
View Answer

Correct Answer
verified
Most variable frequency drives...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
IGBT
Insulated Gate ...
View Answer

Correct Answer
verified
saturation

Correct Answer
verified
Thyristors are solid-state dev...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Two basic methods of...
View Answer

Correct Answer
verified

Correct Answer
verified
A great advantage of drives using IGBTs is the fact that SCRs are generally not used in the power supply and this greatly reduces problems with line harmonics.

Correct Answer
verified

Correct Answer
verified
transistors