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WorksheetsELEC 11001
Total questions: 29
Worksheet time: 22mins
There are _______ separate sections on a schematic for the control of a reversing motor magnetic starter.
3
5
7
9
When the armature is manually pushed, the meter reading suggests that:
The Coil is burnt
The Coil is functioning properly
The Armature is damaged
The Meter is faulty
The ampere reads OL on the circuit breaker this is considered the:
Continuous
Peak
Surge
Interrupting
The overcurrent protective device shown is suited for the protection of circuits with low interrupting ratings because:
They are inexpensive
They have a high speed of response to over-currents
They are easy to install
They have a low speed of response to over-currents
Electrical interlocking in the FORWARD circuit is achieved by placing _______ contacts controlled by the ________ coil in ______ with the _______ coil.
NO, FORWARD, PARALLEL, REVERSE
NC, FORWARD, SERIES, REVERSE
NC, REVERSE, SERIES, FORWARD
NO, REVERSE, PARALLEL, FORWARD
Choose the pilot device that is considered a maintained type.
Push Button
Toggle Switch
Selector Switch
Limit Switch
Which contact changes state to operate a pilot lamp and indicate that a motor magnetic control circuit has tripped?
Overload Contact
Auxiliary Contact
Start Contact
Stop Contact
Which of the following can be used to start, stop, and automatically shut off an electric motor?
Magnetic Starter
Circuit Breaker
Fuse
Relay
Which meter scale is most often used by electricians to troubleshoot faulty motor starters while energized?
Voltage Scale
Current Scale
Resistance Scale
Power Scale
Choose the overload contact that disconnects the control circuit when a motor is mechanically overloaded.
Thermal Overload
Magnetic Overload
Electronic Overload
Fuse
Overload devices installed on motor starters will react to:
Mechanical Overloads
Voltage Spikes
Short Circuits
Ground Faults
Connecting an ohmmeter with the circuit de-energized to terminals shown will read:
Infinite Ohms
High Ohms
Low Ohms
Zero Ohms
A reversing magnetic starter has a mechanical interlock to:
Prevent overheating
Ensure proper voltage supply
Protect against short circuits
Ensure both contactors do not pull in at the same time
Choose the interlocking circuit that will affect both the starting and running of the motor magnetic starter.
Electrical Interlock
Mechanical Interlock
Thermal Interlock
Magnetic Interlock
Select the motor magnetic starter device that senses when a motor is being overloaded:
Circuit Breaker
Fuse
Overload Relay
Contactor
Choose the automatic pilot device that can be used to measure liquid level in a tank or vessel.
Float Switch
Pressure Switch
Limit Switch
Temperature Switch
Choose the automatic pilot device that can be used to measure the travel of a piece of equipment for positioning purposes.
Limit Switch
Pressure Switch
Float Switch
Temperature Switch
Choose the pilot device that is considered a momentary type.
Push Button
Toggle Switch
Selector Switch
Limit Switch
How many overload relays are typically used in a three-phase motor starter?
1
2
3
4
To operate a motor magnetic circuit controlling the same motor from two separate locations, the push buttons must be:
Two NO connected in series and two NC connected in parallel
Two NC connected in series and two NO connected in parallel
Two NO connected in parallel and two NC connected in series
Two NC connected in parallel and two NO connected in series
Which of the following is an example of an overload protection device?
Circuit Breaker
Fuse
Thermal Overload Relay
Surge Protector
Which of the following is a key factor in determining the suitability of a motor starter for a specific application?
Motor horsepower and voltage rating
Color of the starter enclosure
Length of the control wires
Type of pushbuttons used
What does an infinite ohmmeter reading across a contactor coil indicate?
The coil is functioning properly
The coil is open or burnt out
The coil is shorted
The coil is overloaded
What is the primary purpose of an overload device in a motor control circuit?
To protect the motor from short circuits
To protect the motor from overheating due to excessive current
To increase the motor's speed
To reduce the motor's voltage
What is the first step in converting a wiring diagram to a schematic diagram?
Identify all the components and their connections
Redraw the diagram using standard symbols
Remove all the wires from the diagram
Add more components to the diagram
Which of the following is a key difference between a wiring diagram and a schematic diagram?
Wiring diagrams use standard symbols, while schematic diagrams do not
Schematic diagrams show the physical layout of components, while wiring diagrams show the electrical connections
Wiring diagrams show the physical layout of components, while schematic diagrams show the electrical connections
There is no difference between the two
What is the purpose of interlock contacts in a control circuit?
To ensure only one coil is energized at a time
To increase the motor's speed
To reduce the motor's voltage
To simplify the wiring diagram
In a multiple station control circuit, how are the STOP pushbuttons connected?
In series
In parallel
In a combination of series and parallel
They are not connected
What is the purpose of an indicating light in a motor control circuit?
To show the motor's speed
To indicate the status of the motor (ON/OFF)
To increase the motor's voltage
To reduce the motor's current
