Question 1

Relays are electromechanical switches that lack auxiliary contacts.

Accepted Answer

A) True 
 B)False  False

Question 2

The ____________________ rating of control transformers generally ranges from 0.75 kilovolt-amperes, or 75 volt-amperes, to 1 kilovolt-ampere, or 1000 volt-ampere.

Accepted Answer

power

Question 3

NEC Section 430.72(C) lists requirements for the protection of transformers employed in motor control circuits.

Accepted Answer

A) True 
 B)False  True

Question 4

Control transformers generally have ____ terminals connected to the primary and secondary leads.

Accepted Answer

A)  barrier 
B)  luster 
C)  block 
D)  screw 
A)  barrier 
B)  luster 
C)  block 
D)  screw

Question 5

What are ghost voltages?

Accepted Answer

If one voltmeter probe were to be connec

Question 6

What problems can insufficient coil voltage cause?

Accepted Answer

Insufficient coil voltage can produce as

Question 7

How are control transformers protected?

Accepted Answer

Control transformers are generally prote

Question 8

It is a common practice to not ground one side of the control transformer. This is generally referred to as a ____ system.

Accepted Answer

A)  rated 
B)  floating 
C)  ghost 
D)  fused 
A)  rated 
B)  floating 
C)  ghost 
D)  fused

Question 9

Mechanically held contactors and relays are often referred to as ____ contactors or relays.

Accepted Answer

A)  vacuum 
B)  coil clearing 
C)  sequenced 
D)  latching 
A)  vacuum 
B)  coil clearing 
C)  sequenced 
D)  latching

Question 10

Most industrial motors operate on voltages that range from 240 to 480 volts.

Accepted Answer

A) True 
 B)False

Question 11

The greatest difference between relays and contactors is the fact that contactors are equipped with large contacts that are intended to connect high-current loads to the power line.

Accepted Answer

A) True 
 B)False

Question 12

Solid-state relays that are intended to connect alternating current loads to the line use a device called a(n) ____________________.

Accepted Answer

The answer of Solid-state relays that are intended to connect...

Question 13

The number of ____________________ refers to the load contacts and does not include the number of control or auxiliary contacts.

Accepted Answer

The answer of The number of ____________________ refers to the...

Relays are electromechanical switches that lack auxiliary contacts.

The ____________________ rating of control transformers generally ranges from 0.75 kilovolt-amperes, or 75 volt-amperes, to 1 kilovolt-ampere, or 1000 volt-ampere.

NEC Section 430.72(C) lists requirements for the protection of transformers employed in motor control circuits.

Control transformers generally have ____ terminals connected to the primary and secondary leads.

What are ghost voltages?

What problems can insufficient coil voltage cause?

How are control transformers protected?

It is a common practice to not ground one side of the control transformer. This is generally referred to as a ____ system.

Mechanically held contactors and relays are often referred to as ____ contactors or relays.

Most industrial motors operate on voltages that range from 240 to 480 volts.

The greatest difference between relays and contactors is the fact that contactors are equipped with large contacts that are intended to connect high-current loads to the power line.

Solid-state relays that are intended to connect alternating current loads to the line use a device called a(n) ____________________.

The number of ____________________ refers to the load contacts and does not include the number of control or auxiliary contacts.

General Principles of Motor Control, Symbols and Schematic Diagrams

Manual Starters and Overload Relays

Timing Relays, Pressure Switches and Sensors

Float Switches, Flow Switches and Sensors

Limit Switches and Phase Failure Relays

Temperature Sensing, Devices M Solenoid and Motor Operated Valves

Hall Effect Sensors and Proximity Detectors

Basic Control Circuits and Photodetectors

Schematics, Wiring Diagrams Circuit (1), Timed Starting for Three Motors Circuit (2)

Float Switch Control of a Pump and Pilot Lights Circuit (3), Developing a Wiring Diagram Circuit (1)

Developing a Wiring Diagram Circuit (2) and Developing a Wiring Diagram Circuit (3)

Installing Control Systems and Reading Large Schematic Diagrams

Multiple Push Button Stations and Hand-Off-Automatic Controls

Forward-Reverse Control, Jogging and Inching

Dc Motors and Sequence Control

Solid-State Dc Drives and Starting Methods for DC Motors

Stepping Motors, the Motor and Starting Methods

Autotransformer Starting , Resistor and Reactor Starting for Ac Motors

Wye-Delta Starting, Part Winding Starters

Braking , Consequent Pole Motors, Variable Voltage and Magnetic Clutches

Variable Frequency Control

Troubleshooting, Motor Installation and Developing Control Circuits

Digital Logic and the Bounceless Switch

Programmable Logic Controllers and Start-Stop Push Button Control

Programming a PLC and Analog Sensing for Programmable Controllers

Filters

Exam 3: The Control Transformer, Relays, Contactors, and Motor Starters

Relays are electromechanical switches that lack auxiliary contacts.

The ____________________ rating of control transformers generally ranges from 0.75 kilovolt-amperes, or 75 volt-amperes, to 1 kilovolt-ampere, or 1000 volt-ampere.

NEC Section 430.72(C) lists requirements for the protection of transformers employed in motor control circuits.

Control transformers generally have ____ terminals connected to the primary and secondary leads.

What are ghost voltages?

What problems can insufficient coil voltage cause?

How are control transformers protected?

It is a common practice to not ground one side of the control transformer. This is generally referred to as a ____ system.

Mechanically held contactors and relays are often referred to as ____ contactors or relays.

Most industrial motors operate on voltages that range from 240 to 480 volts.

The greatest difference between relays and contactors is the fact that contactors are equipped with large contacts that are intended to connect high-current loads to the power line.

Solid-state relays that are intended to connect alternating current loads to the line use a device called a(n) ____________________.

The number of ____________________ refers to the load contacts and does not include the number of control or auxiliary contacts.

General Principles of Motor Control, Symbols and Schematic Diagrams

Manual Starters and Overload Relays

Timing Relays, Pressure Switches and Sensors

Float Switches, Flow Switches and Sensors

Limit Switches and Phase Failure Relays

Temperature Sensing, Devices M Solenoid and Motor Operated Valves

Hall Effect Sensors and Proximity Detectors

Basic Control Circuits and Photodetectors

Schematics, Wiring Diagrams Circuit (1), Timed Starting for Three Motors Circuit (2)

Float Switch Control of a Pump and Pilot Lights Circuit (3), Developing a Wiring Diagram Circuit (1)

Developing a Wiring Diagram Circuit (2) and Developing a Wiring Diagram Circuit (3)

Installing Control Systems and Reading Large Schematic Diagrams

Multiple Push Button Stations and Hand-Off-Automatic Controls

Forward-Reverse Control, Jogging and Inching

Dc Motors and Sequence Control

Solid-State Dc Drives and Starting Methods for DC Motors

Stepping Motors, the Motor and Starting Methods

Autotransformer Starting , Resistor and Reactor Starting for Ac Motors

Wye-Delta Starting, Part Winding Starters

Braking , Consequent Pole Motors, Variable Voltage and Magnetic Clutches

Variable Frequency Control

Troubleshooting, Motor Installation and Developing Control Circuits

Digital Logic and the Bounceless Switch

Programmable Logic Controllers and Start-Stop Push Button Control

Programming a PLC and Analog Sensing for Programmable Controllers

Filters