Question 1

Open-loop control is also called automatic control.

Accepted Answer

A) True 
 B)False  False

Question 2

Mechanical vibration may loosen the mounting or alter the ____ of feedback devices.

Accepted Answer

A)  input 
B)  alignment 
C)  adjustment 
D)  control 
A)  input 
B)  alignment 
C)  adjustment 
D)  control B

Question 3

A command signal, sometimes called the ____ or reference signal, is programmed into the DC drive and sets the desired operating speed of a DC motor.

Accepted Answer

A)  steady state 
B)  target 
C)  set point 
D)  continuous 
A)  steady state 
B)  target 
C)  set point 
D)  continuous C

Question 4

A(n) ____ is a circuit that uses very fast electronic switches.

Accepted Answer

A)  booster 
B)  stepper 
C)  modulator 
D)  chopper 
A)  booster 
B)  stepper 
C)  modulator 
D)  chopper

Question 5

If the motor doesn't run, the problem must be the drive.

Accepted Answer

A) True 
 B)False

Question 6

In which quadrant of motor operation is the motor motoring, or moving a load in the forward direction?

Accepted Answer

A)  One 
B)  Two 
C)  Three 
D)  Four 
A)  One 
B)  Two 
C)  Three 
D)  Four

Question 7

An electronic variable speed drive has two basic sections: the control section and the power section.

Accepted Answer

A) True 
 B)False

Question 8

A controller's ____ determines how well it responds to changes in motor performance and is usually expressed as a percentage.

Accepted Answer

A)  set point 
B)  regulation 
C)  efficiency 
D)  feedback 
A)  set point 
B)  regulation 
C)  efficiency 
D)  feedback

Question 9

Most drive failures occur in the ____ section, where you will find power SCRs, transistors, MOSFETs, and so on.

Accepted Answer

A)  power 
B)  control 
C)  feedback 
D)  transistor 
A)  power 
B)  control 
C)  feedback 
D)  transistor

Question 10

Motor operation in quadrant ____ produces regenerative braking action when the motor turns in reverse.

Accepted Answer

A)  One 
B)  Two 
C)  Three 
D)  Four 
A)  One 
B)  Two 
C)  Three 
D)  Four

Question 11

The most common cause of motor failure is heat.

Accepted Answer

A) True 
 B)False

Question 12

The control section of a DC drive uses three types of signals to evaluate motor performance: the command, feedback, and ____ signals.

Accepted Answer

A)  set point 
B)  reference 
C)  error 
D)  open-loop 
A)  set point 
B)  reference 
C)  error 
D)  open-loop

Question 13

Which of the following can be adjusted to detect certain levels of electrical interference or "noise," and trips the drive in the event of a voltage sag, spike, or single phasing?

Accepted Answer

A)  Watchdog circuit 
B)  MOSFET circuit 
C)  IR compensation circuit 
D)  Ramp rate circuit 
A)  Watchdog circuit 
B)  MOSFET circuit 
C)  IR compensation circuit 
D)  Ramp rate circuit

Question 14

Armature voltage control is the type most commonly used in DC drives.

Accepted Answer

A) True 
 B)False

Question 15

In which quadrant of motor operation is the motor regenerating?

Accepted Answer

A)  One 
B)  Two 
C)  Three 
D)  Four 
A)  One 
B)  Two 
C)  Three 
D)  Four

Open-loop control is also called automatic control.

Mechanical vibration may loosen the mounting or alter the ____ of feedback devices.

A command signal, sometimes called the ____ or reference signal, is programmed into the DC drive and sets the desired operating speed of a DC motor.

A(n) ____ is a circuit that uses very fast electronic switches.

If the motor doesn't run, the problem must be the drive.

In which quadrant of motor operation is the motor motoring, or moving a load in the forward direction?

An electronic variable speed drive has two basic sections: the control section and the power section.

A controller's ____ determines how well it responds to changes in motor performance and is usually expressed as a percentage.

Most drive failures occur in the ____ section, where you will find power SCRs, transistors, MOSFETs, and so on.

Motor operation in quadrant ____ produces regenerative braking action when the motor turns in reverse.

The most common cause of motor failure is heat.

The control section of a DC drive uses three types of signals to evaluate motor performance: the command, feedback, and ____ signals.

Which of the following can be adjusted to detect certain levels of electrical interference or "noise," and trips the drive in the event of a voltage sag, spike, or single phasing?

Armature voltage control is the type most commonly used in DC drives.

In which quadrant of motor operation is the motor regenerating?

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Electrical Power and Energy

Test Equipment

Basic Resistive Electrical Circuits

Magnets and Magnetism

Alternating Current

Ac Circuits

Conductor Types and Sizes

Wiring Methods

Wiring Applications

Transformers

Electrical Distribution

Lighting

Electric Heat

Dc Generators

Dc Motors

Ac Generators Alternators

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Exam 22: Dc Electronic Variable Speed Drives

Open-loop control is also called automatic control.

Mechanical vibration may loosen the mounting or alter the ____ of feedback devices.

A command signal, sometimes called the ____ or reference signal, is programmed into the DC drive and sets the desired operating speed of a DC motor.

A(n) ____ is a circuit that uses very fast electronic switches.

If the motor doesn't run, the problem must be the drive.

In which quadrant of motor operation is the motor motoring, or moving a load in the forward direction?

An electronic variable speed drive has two basic sections: the control section and the power section.

A controller's ____ determines how well it responds to changes in motor performance and is usually expressed as a percentage.

Most drive failures occur in the ____ section, where you will find power SCRs, transistors, MOSFETs, and so on.

Motor operation in quadrant ____ produces regenerative braking action when the motor turns in reverse.

The most common cause of motor failure is heat.

The control section of a DC drive uses three types of signals to evaluate motor performance: the command, feedback, and ____ signals.

Which of the following can be adjusted to detect certain levels of electrical interference or "noise," and trips the drive in the event of a voltage sag, spike, or single phasing?

Armature voltage control is the type most commonly used in DC drives.

In which quadrant of motor operation is the motor regenerating?

Language of Electricity

Electrical Fundamentals

Electrical Power and Energy

Test Equipment

Basic Resistive Electrical Circuits

Magnets and Magnetism

Alternating Current

Ac Circuits

Conductor Types and Sizes

Wiring Methods

Wiring Applications

Transformers

Electrical Distribution

Lighting

Electric Heat

Dc Generators

Dc Motors

Ac Generators Alternators

Ac Motors

Motor Control Devices and Circuits

Basic Industrial Electronics

Ac Inverter Drives

Programmable Logic Controllers

Filters