Electrical engineering quiz questions and answers on manual motor starters, single-phase AC motors, toggle-switch motor control, overload protection, FHP motor starters, HOA control, Contactor control, AC induction motor, and etc.
Quiz on Manual Motor Starters
In a wiring diagram, a ___________ is the standard symbol for a motor.
C) none of the answers
When a single-phase AC induction motor operates at the lower phase-to-ground voltage of 115 volts and the motor field leads are number-identified, the:
The ungrounded circuit conductor should be connected to either line or motor terminal.
The grounded circuit conductor should be connected to either line or motor-terminal.
A) L2; L1; T1; T2
B) L1; L2; T1; T2
C) T1; T2; L1; L2
D) L1; L1; T1; T2
When wiring a motor control circuit, you must color-code all the conductors to identify their circuit function — whether they are grounded or ungrounded — to prevent miss-wiring or inadvertent short-circuit conditions.
A 3-phase manual motor starter uses a(n) ______ linkage to close all three power (load) contacts simultaneously.
A) broken line
B) Either broken line or mechanical
Before power can be applied to the connected motor, the overload heater (element) must be installed in the FHP motor starter because _________.
A) Either the ON position of the toggle switch will not latch unless the heater element has been installed or the load side of the switch is internally wired in series with the overload element.
B) the overload heater would overheat more so than the motor due to the resistance of the loose connection.
C) the load side of the switch is internally wired in series with the overload element.
D) the ON position of the toggle switch will not latch unless the heater element has been installed.
For troubleshooting, the ___________ position can be used as a pilot device manual override.
A) none of the answers
When a selector switch or pilot device is used to control the solenoid of a contractor, and the switching contacts of the contactor are used to control the run status of the motor, the contactor can be used to increase the __________ rating of the switch or pilot device.
D) All of The answers
As used with selector switches, the term __________ indicates that the load current is interrupted at two contact points within the switch instead of one.
Resetting of a tripped 3-phase AC integral-horsepower manual motor starter due to motor mechanical overload requires the ____________.
A) start Pushbutton switch to be pressed hard into the start position
B) stop Pushbutton switch to be pressed hard into the start position
C) start Pushbutton switch to be pressed hard into the stop position
D) stop Pushbutton switch to be pressed hard into the stop position
When the knife disconnecting means in the motor-controls wiring laboratory at a given lab station is closed, the lower phase-to-neutral supply voltage can be measured to any grounded metal enclosure or other surfaces at either the selector switch location, the motor-starter location, or the motor location, because ___________ at the point of power supply for the wiring lab station.
A) the equipment grounding means (conductor) is connected common to the Line 3 ungrounded circuit conductor
B) the equipment grounding means (conductor) is connected common to the Line 2 ungrounded circuit conductor
C) the equipment grounding means (conductor) is connected common to the Line 1 ungrounded circuit conductor
D) the equipment grounding means (conductor) is connected common to the neutral grounded circuit conductor
When the FHP motor starter is located remote from the motor location, the overload protection must be temperature compensated for the difference in ambient temperatures.
When pilot devices are required in automated motor-circuit control circuits, _________ switches are normally used to sense or regulate position or motion.
Before starting any actual wiring of a motor circuit, you should verify the absence of voltage (no voltage) on the ___________ side of the disconnecting means to ensure you are working on a wiring lab that is not energized.
B) both line & load
C) none of the answers
When an FHP motor operates at 120 volts, the toggle switch must be located in (wired in series with) the _________ supply conductor to the motor.
The _________ return circuit conductor must have a solid (screw terminal) connection between the motor winding lead and the neutral supply busbar or terminal strip in the supply load center.
A) grounded; ungrounded
B) grounded; grounded
C) none of the answers
D) ungrounded; grounded
When used to control the ON/OFF status of a fan or other motor application of a fractional-horsepower AC induction motor, the set of contacts, which are _________ when the selector switch is placed in the designated OFF position, must be used to control the power supplied to the motor.
C) all of the answers
D) none of the answers
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This work was created by Marco Gotshaw and is licensed under a Creative Commons Attribution 4.0 International License.
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