The contacts of a(n) ___________ switch are open until acted Normally open
on by the operator.
A simple method for opening or closing a circuit is to use Switch
a ___________.
Rotary motion is the output of which electrical output Motor
device?
A knife switch consists of a lever and one or more sets of Contacts
___________.
Constant voltage power supplies will maintain a constant Loads
voltage output under varying ___________.
A three-wire control circuit is not as safe as a two-wire FALSE
control circuit.
When a relay is connected so that it continues to Seal-in circuit
energize itself after a momentary input is removed, the
circuit is called a ___________.
Which of the following is not a typical input device used Pushbutton switch
for two-wire control circuits?
___________ is a method of representing one component with Detatched symbology
several symbols in various locations on a ladder diagram.
Machine control relays are designed for light-duty FALSE
industrial applications.
The minimum number of sets of contacts a motor starter TRUE
has depends on the number of power leads the motor
requires.
A control relay is designed to switch components on and FALSE
off only when it receives a manual input.
A push-to-test pilot light allows the operator to test the TRUE
indicator bulb to make sure it works.
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Control relays are not capable of performing memory TRUE
logic by themselves.
A push-to-test light is exactly the same as a regular FALSE
indicator lamp, except it has a special color lens.
Which of the following is a component of a magnetic All of the above
motor starter?
Three-wire control circuits are commonly used for TRUE
start/stop pushbutton stations.
Based on the circuit diagram shown, what will happen to The motor will run until the JOG button is released.
the motor if the JOG pushbutton is pressed?
Based on the wiring diagram shown, which of the L1 is connected to T3, L2 is connected to T2, and L3 is connected to T1
following statements is true of a drum switch if the switch
is placed in the reverse position?
Which of the following is a component of a reversing All of the above
magnetic motor starter?
A reversing magnetic motor starter provides a magnetic TRUE
method of changing a motor's direction of rotation.
Examine the circuit shown and determine which type(s) of Auxiliary contact and mechanical interlocking
interlocking is/are shown.
A ___________ is often used to allow an operator or technician Selector switch
to change a machine from the automatic mode to the
manual mode.
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A Hand-Off-Automatic (H-O-A) circuit requires a selector 3
switch with ___________ positions.
You can reverse the rotation of any three-phase motor by TRUE
interchanging any two of the three power supply lines.
One application of interlocking is to cause both the FALSE
forward and reverse coils of a reversing contactor to be
energized at the same time.
Resistance readings across the windings of a motor FALSE
should be very high.
Which of the following is not a possible cause when none None of the above
of the contacts on a motor contactor change status when
the coil is energized?
Which of the following is a method of testing a All of the above
component?
To determine if an indicator lamp has failed, measure the Resistance
lamp's ___________?
One possible cause for an overload to trip constantly is TRUE
that the trip setting is incorrect (IEC) or the incorrect
heater size is being used (NEMA)
To test a relay coil out-of-circuit, you would measure Resistance
___________.
If none of the contacts of a manual switch change status Mechanical problem with the operator
when the operator is activated, what is the most probable
cause?
Most troubleshooters in manufacturing plants perform FALSE
component level testing.
The IEC developed a standard to rate DMMs based on TRUE
the maximum voltage spike the meter can withstand
without causing an arc.