Exam 17: Solid-State Dc Drives and Starting Methods for DC Motors

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A large diode is often connected across the output of the bridge. This diode is known as a freewheeling, or ____________________, diode and is used to kill inductive spike voltages produced in the armature.

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(Short Answer)

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Question 1

Correct Answer:

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The greatest advantage of using direct current motors is their _____ characteristic.

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(Multiple Choice)

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Question 2

Correct Answer:

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Direct current is difficult to interrupt than alternating current because it to zero at periodic intervals.

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(Multiple Choice)

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Question 3

Correct Answer:

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Contactors that are designed to control direct-current devices are generally of the ____________________ type.

(Short Answer)

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Question 4

If the motor is running and the shunt field opens, the motor will become a(n) ____________________ motor and begin to increase rapidly in speed.

(Short Answer)

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Question 5

How is output voltage control achieved?

(Essay)

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Question 6

Discuss the shunt field power supply.

(Essay)

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Question 7

Most DC motor control circuits use a ____ current relay (FCR) or field loss relay connected in series with the shunt field of the motor.

(Multiple Choice)

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Question 8

What is one way of limiting current in-rush?

(Essay)

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Question 9

When large DC motors are to be started, current in-rush to the armature must be limited.

(True/False)

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Question 10

Most of the solid-state motor controllers intended to provide the DC power needed to operate large DC motors convert three-phase AC voltage directly into DC voltage with a three-phase _____.

(Multiple Choice)

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Question 11

Small DC motors are often started directly across-the-line because they have high inertia.

(True/False)

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Question 12

What is the difference between a pick-up coil and a holding coil?

(Essay)

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Question 13

Showing 1 - 13 of 13

A large diode is often connected across the output of the bridge. This diode is known as a freewheeling, or ____________________, diode and is used to kill inductive spike voltages produced in the armature.

The greatest advantage of using direct current motors is their _____ characteristic.

Direct current is difficult to interrupt than alternating current because it to zero at periodic intervals.

Contactors that are designed to control direct-current devices are generally of the ____________________ type.

If the motor is running and the shunt field opens, the motor will become a(n) ____________________ motor and begin to increase rapidly in speed.

How is output voltage control achieved?

Discuss the shunt field power supply.

Most DC motor control circuits use a ____ current relay (FCR) or field loss relay connected in series with the shunt field of the motor.

What is one way of limiting current in-rush?

When large DC motors are to be started, current in-rush to the armature must be limited.

Most of the solid-state motor controllers intended to provide the DC power needed to operate large DC motors convert three-phase AC voltage directly into DC voltage with a three-phase _____.

Small DC motors are often started directly across-the-line because they have high inertia.

What is the difference between a pick-up coil and a holding coil?

General Principles of Motor Control, Symbols and Schematic Diagrams

Manual Starters and Overload Relays

The Control Transformer, Relays, Contactors, and Motor Starters

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

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 17: Solid-State Dc Drives and Starting Methods for DC Motors

A large diode is often connected across the output of the bridge. This diode is known as a freewheeling, or ____________________, diode and is used to kill inductive spike voltages produced in the armature.

The greatest advantage of using direct current motors is their _____ characteristic.

Direct current is ____ difficult to interrupt than alternating current because it ____ to zero at periodic intervals.

Contactors that are designed to control direct-current devices are generally of the ____________________ type.

If the motor is running and the shunt field opens, the motor will become a(n) ____________________ motor and begin to increase rapidly in speed.

How is output voltage control achieved?

Discuss the shunt field power supply.

Most DC motor control circuits use a ____ current relay (FCR) or field loss relay connected in series with the shunt field of the motor.

What is one way of limiting current in-rush?

When large DC motors are to be started, current in-rush to the armature must be limited.

Most of the solid-state motor controllers intended to provide the DC power needed to operate large DC motors convert three-phase AC voltage directly into DC voltage with a three-phase _____.

Small DC motors are often started directly across-the-line because they have high inertia.

What is the difference between a pick-up coil and a holding coil?

General Principles of Motor Control, Symbols and Schematic Diagrams

Manual Starters and Overload Relays

The Control Transformer, Relays, Contactors, and Motor Starters

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

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

Direct current is difficult to interrupt than alternating current because it to zero at periodic intervals.