Question 1

An advantage of the variable voltage drive is good speed control.

Accepted Answer

A) True 
 B)False  False

Question 2

Slip is the difference between the speed of the rotating field and the speed of the rotor.

Accepted Answer

A) True 
 B)False  True

Question 3

In a thyristor drive, the SCR controls the amount of current that flows through the armature of a DC motor.

Accepted Answer

A) True 
 B)False  True

Question 4

Which of the following is not a type of compound motor?

Accepted Answer

A)  Interpole 
B)  Integrator 
C)  Differential 
D)  Cumulative 
A)  Interpole 
B)  Integrator 
C)  Differential 
D)  Cumulative

Question 5

Match the portion of the curve t o motor operation.
  
-Between rated torque and maximum torque

Accepted Answer

A)  Stalls 
B)  Normal operating range 
C)  Provides breakaway torque 
D)  Provides the starting torque 
E)  Operates temporari 
A)  Stalls 
B)  Normal operating range 
C)  Provides breakaway torque 
D)  Provides the starting torque 
E)  Operates temporari

Question 6

AC motors can be designed to be operational in an explosive and dust -ignition environments.

Accepted Answer

A) True 
 B)False

Question 7

Universal motors can operate on either DC or single phase AC power.

Accepted Answer

A) True 
 B)False

Question 8

A resistor in a DC exciter discharges the current generated in the field of a synchronous motor after synchronous speed has been achieved.

Accepted Answer

A) True 
 B)False

Question 9

In the resistance -start, induction -run motor, the current in the start winding leads the input voltage.

Accepted Answer

A) True 
 B)False

Question 10

In a capacitor -start, capacitor -run motor, the centrifugal switch disconnects a start capacitor and connects a run capacitor.

Accepted Answer

A) True 
 B)False

Question 11

Match the following.
-Control circuitry

Accepted Answer

A)  Usually a thyristor bridge 
B)  Controls the phase of the current 
C)  Consists of solid-state switches 
D)  Provides signals for frequency control 
E)  Smooths regulated DC voltage 
A)  Usually a thyristor bridge 
B)  Controls the phase of the current 
C)  Consists of solid-state switches 
D)  Provides signals for frequency control 
E)  Smooths regulated DC voltage

Question 12

Delta configuration windings are connected in parallel as are wye configuration windings, thus providing for low -voltage input.

Accepted Answer

A) True 
 B)False

Question 13

The line -to -line voltage is greater for a delta -connected three -phase motor than for awye -connected three -phase motor with both motors having the same phase voltage inputs.

Accepted Answer

A) True 
 B)False

Question 14

Match the overload block with its operation.
-Phase loss

Accepted Answer

A)  Uses dissimilar materials 
B)  Uses motor voltage 
C)  Uses motor current 
D)  Uses melting poin 
A)  Uses dissimilar materials 
B)  Uses motor voltage 
C)  Uses motor current 
D)  Uses melting poin

Question 15

This waveform is for a________drive.

Accepted Answer

A)  Flux vector 
B)  Pulse width modulation 
C)  Variable voltage 
D)  Variable resistance 
E)  Programmable motor 
A)  Flux vector 
B)  Pulse width modulation 
C)  Variable voltage 
D)  Variable resistance 
E)  Programmable motor

Question 16

In a resistance -start, induction -run motor, the phase difference between the current in the start winding and the run winding is 90 degrees.

Accepted Answer

A) True 
 B)False

Question 17

Starting torque is equal to stall torque.

Accepted Answer

A) True 
 B)False

Question 18

Eddy currents cause the temperature to rise in the core of the rotor.

Accepted Answer

A) True 
 B)False

Question 19

Match the portion of the curve t o motor operation.
  
-Between no -load speed and full -load speed

Accepted Answer

A)  Stalls 
B)  Normal operating range 
C)  Provides breakaway torque 
D)  Provides the starting torque 
E)  Operates temporari 
A)  Stalls 
B)  Normal operating range 
C)  Provides breakaway torque 
D)  Provides the starting torque 
E)  Operates temporari

Question 20

The synchronous motor efficiently converts electrical power to mechanical power.

Accepted Answer

A) True 
 B)False

An advantage of the variable voltage drive is good speed control.

Slip is the difference between the speed of the rotating field and the speed of the rotor.

In a thyristor drive, the SCR controls the amount of current that flows through the armature of a DC motor.

Which of the following is not a type of compound motor?

Match the portion of the curve t o motor operation. -Between rated torque and maximum torque

AC motors can be designed to be operational in an explosive and dust -ignition environments.

Universal motors can operate on either DC or single phase AC power.

A resistor in a DC exciter discharges the current generated in the field of a synchronous motor after synchronous speed has been achieved.

In the resistance -start, induction -run motor, the current in the start winding leads the input voltage.

In a capacitor -start, capacitor -run motor, the centrifugal switch disconnects a start capacitor and connects a run capacitor.

Match the following. -Control circuitry

Delta configuration windings are connected in parallel as are wye configuration windings, thus providing for low -voltage input.

The line -to -line voltage is greater for a delta -connected three -phase motor than for awye -connected three -phase motor with both motors having the same phase voltage inputs.

Match the overload block with its operation. -Phase loss

This waveform is for a________drive.

In a resistance -start, induction -run motor, the phase difference between the current in the start winding and the run winding is 90 degrees.

Starting torque is equal to stall torque.

Eddy currents cause the temperature to rise in the core of the rotor.

Match the portion of the curve t o motor operation. -Between no -load speed and full -load speed

The synchronous motor efficiently converts electrical power to mechanical power.

Introduction to Industrial Control Systems, Discrete Control Input and Output Devices

Solidstate Devices in Industrial Applications, Operational Amplifiers and Linear ICS

SCRS, Triacs, Other Thryristors, Discrete Automation Sensors and Devices

Analog Processes Control Devices, Sensors and Safety

Special Purpose Motor, Control Devices and Programmable Logic Controllers

Embedded Microcontrollers, Open and Closed Loop Process Control

Industrial Robots, Automation Systems and Data Communication Between Intelligent Machines

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Exam 5: DC Motors, Control Circuits, AC Motors and Variable Speed Drives

An advantage of the variable voltage drive is good speed control.

Slip is the difference between the speed of the rotating field and the speed of the rotor.

In a thyristor drive, the SCR controls the amount of current that flows through the armature of a DC motor.

Which of the following is not a type of compound motor?

Match the portion of the curve t o motor operation. -Between rated torque and maximum torque

AC motors can be designed to be operational in an explosive and dust -ignition environments.

Universal motors can operate on either DC or single phase AC power.

A resistor in a DC exciter discharges the current generated in the field of a synchronous motor after synchronous speed has been achieved.

In the resistance -start, induction -run motor, the current in the start winding leads the input voltage.

In a capacitor -start, capacitor -run motor, the centrifugal switch disconnects a start capacitor and connects a run capacitor.

Match the following. -Control circuitry

Delta configuration windings are connected in parallel as are wye configuration windings, thus providing for low -voltage input.

The line -to -line voltage is greater for a delta -connected three -phase motor than for awye -connected three -phase motor with both motors having the same phase voltage inputs.

Match the overload block with its operation. -Phase loss

This waveform is for a________drive.

In a resistance -start, induction -run motor, the phase difference between the current in the start winding and the run winding is 90 degrees.

Starting torque is equal to stall torque.

Eddy currents cause the temperature to rise in the core of the rotor.

Match the portion of the curve t o motor operation. -Between no -load speed and full -load speed

The synchronous motor efficiently converts electrical power to mechanical power.

Introduction to Industrial Control Systems, Discrete Control Input and Output Devices

Solidstate Devices in Industrial Applications, Operational Amplifiers and Linear ICS

SCRS, Triacs, Other Thryristors, Discrete Automation Sensors and Devices

Analog Processes Control Devices, Sensors and Safety

Special Purpose Motor, Control Devices and Programmable Logic Controllers

Embedded Microcontrollers, Open and Closed Loop Process Control

Industrial Robots, Automation Systems and Data Communication Between Intelligent Machines

Filters