Electrical 2

A detailed illustration showing a schematic of an electrical motor control system, including labeled components such as contactors, relays, and overload protection devices, with a technical and educational feel.

Electrical Motor Control Quiz

Test your knowledge on motor control systems and electrical circuits with our engaging quiz designed specifically for enthusiasts and professionals in the electrical field.

Challenge yourself with questions covering:

  • Motor starter functionality
  • Induction motor operations
  • Electrical troubleshooting techniques
35 Questions9 MinutesCreated by WiringWizard401
If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed the __________.
Shading coil is loose
Contacts have become welded together
Shading coil is broken
Contacts are carrying excessive current
If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open) __________.
The motor will immediately stop and can only be restarted at no load
More torque will be developed
The motor will immediately stop and not be able to be restarted
The motor will continue to run if it is not heavily loaded
When troubleshooting a motor controller, all indications are that a relay coil should be energized. If there were no magnetic pull, with rated voltage measured across the coil, the most probable cause would be that the
Relay armature is stuck
Control fuse is open auxiliary
Contact in series with the coil is defective
Coil is open
The wiring diagram for the motor starting circuit shown in the illustration (EL-0007) indicates __________.
Low voltage release
Reduced voltage starting
Low voltage protection
Resistance starting
If the illustrated motor (EL-0007) fails to start and gives a loud hum when the start button is pushed, the problem is __________.
The control circuit fuse is open
The 'Disc. sw.' is open
Power to 'L1' at the 'Disc. sw.' is not energized because of a problem with the ship's electrical distribution system
One of the phases to the motor is not energized because of an open motor lead
If the motor fails to start and a voltmeter reading between 1 and 6, as illustrated (EL-0007), indicates line voltage, your next step should be to.
Check line voltage between L1 and L2
Replace or repair contact 'Ma'
Reset and determine the cause of the overload
Replace fuse "10A"
The motor starts when the start button in the illustration (El-0007) is pushed, but stops when the button is released the trouble is __________.
A faulty holding relay contact 'Ma'
A faulty "M" coil
A dirty contact on the Disc.Sw. At 'L3'
The incorrect thermal overload coil
The illustrated motor (EL-0007) fails to start and gives a loud hum when the start button is depressed, your first action should be to __________.
Hold the "M" contactor closed by hand while wearing electrical safety gloves to get motor started
Push the stop button to deenergize the "M" coil
Reset the thermal overload
Disassemble the motor to fix the centrifugal switch so the start windings will be energized
In the illustrated motor controller (EL-0007), the motor fails to start. A voltmeter reading between 1 and 6 reads line voltage, while the voltmeter reading between 2 and 6 reads 0 VAC. The problem is
Fuse "10A" is blown
The stop switch is open
An open in the "M" coil, 'Ma' contact/start switch or overload contacts
The control fuse is the wrong amperage not allowing full current to pass through
What type of electrical control diagram is shown in the illustration EL-0007?
Wiring diagram
Schematic diagram
One line diagram
Logic diagram
If the circuit shown in the illustration (EL-0007) was energized and operating properly, which of the devices listed would be open?
Contact 'OL1'
The start push-button
Contact 'Ma'
The stop push-button
If an electric motor fails to start, you should FIRST check the __________.
Line frequency
Ampere load
Fuse or circuit breaker
Phase sequence
A three-phase, squirrel cage, induction motor will run hot due to __________.
Reversed commutating poles
High power factor
Dirty or corroded slip rings
Open stator coils
If the illustrated motor fails to start and gives a loud hum when the start button is pushed, the problem is __________.
One of the phases to the motor is not energized because of an open motor lead
The 'Disc. sw.' is open
Power to 'L1' at the 'Disc. sw.' is not energized because of a problem with the ship's electrical distribution system
The control circuit fuse is open
If the motor fails to start and a voltmeter reading between 1 and 6, as illustrated, indicates line voltage, your next step should be to __________.
Replace fuse "10A"
Replace or repair contact 'Ma'
Reset and determine the cause of the overload
Check line voltage between L1 and L2
The motor starts when the start button in the illustration is pushed, but stops when the button is released the trouble is __________.
The incorrect thermal overload coil
A faulty "M" coil
A dirty contact on the Disc.Sw. At 'L3'
A faulty holding relay contact 'Ma'
The illustrated motor fails to start and gives a loud hum when the start button is depressed, your first action should be to __________.
Disassemble the motor to fix the centrifugal switch so the start windings will be energized
Push the stop button to de-energize the "M" coil
Reset the thermal overload
Hold the "M" contactor closed by hand while wearing electrical safety gloves to get motor started
In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 6 reads line voltage, while the voltmeter reading between 2 and 6 reads 0 VAC. The problem is __________.
The control fuse is the wrong amperage not allowing full current to pass through
The stop switch is open
An open in the "M" coil, 'Ma' contact/start switch or overload contacts
Fuse "10A" is blown
What type of electrical control diagram is shown in the illustration?
Logic diagram
Schematic diagram
One line diagram
Wiring diagram
If the circuit shown in the illustration were energized and operating properly, which of the devices listed would be open?
The stop push-button
The start push-button
Contact 'Ma'
Contact 'OL1'
The wiring diagram for the motor starting circuit shown in the illustration indicates __________.
Resistance starting
Reduced voltage starting
Low voltage protection
Low voltage release
The schematic diagram shown in the illustration uses symbol "A" to represent a/an __________.
Non-renewable fuse link
Circuit breaker coil
Overload relay coil
Thermal overload heater
Referring to the illustrated schematic diagram, which of the following statements is true when the motor is running in the forward direction?
Normally-open contacts '4-5' are closed.
Current flows through the 'Reverse' push-button switch.
Normally-closed contacts "R" are open.
The blowout coils must be closed.
If the three-phase motor, shown in the illustrated schematic diagram, is running in the forward direction, which of the following actions must occur before the motor will reverse rotation?
Normally-closed contacts "4"-"5" must open.
Normally- open contacts "2"-"3" must close.
'L1' and 'L3' must be interchanged via the "R" contacts.
All of the above.
If the supply voltage is 220 volts 60 Hz, what is the operating voltage of the motor controller circuitry illustrated?
110 volts DC
110 volts AC
220 volts DC
220 volts AC
What operational characteristics do the components labeled as "S" and "R" represent in the motor controller diagram shown in the illustration?
Standard and Reverse directions
Stop and Restart features
Subnormal and Regular loading
Start and Run functions
Which two components, shown in the illustration, acting together will disconnect the motor from the line in case of a sustained motor overload?
"G" and "H"
"E" and "I"
"F" and "H"
"E" and "G"
Which device will stop the motor shown in the illustration in case of a short-circuit (high current) motor overload?
"F"
"G"
"H"
"I"
Which component will stop the motor shown in the illustration in case of an overload in the control circuit?
"E"
"G"
"H"
"I"
Which of the listed types of motor controllers and starters is illustrated?
Across-the-line
Primary-resistor
Autotransformer
Part-winding
If the line voltage to the controller shown in the illustration is 440 volts, what is applied across the control circuit?
110 volts
220 volts
440 volts
660 volts
If the line voltage to the controller shown in the illustration is 440 volts, what is applied voltage to the motor when in the 'start' mode
110 volts
220 volts
440 volts
660 volts
If the line voltage to the controller shown in the illustration is 440 volts, what is applied voltage to the motor when in the 'run' mode
110 volts
220 volts
440 volts
660 volts
The standard measuring unit of wire by its cross-sectional area, as used in American wire tables is the __________.
Square millimeter
Circular mils
Cubic mils
Cubic inch
Which of the AWG wire sizes listed below would have the smallest diameter?
14
0
0000
12
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