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NCCER 26211-20 | QUESTIONS AND
VERIFIED SOLUTIONS LATEST
UPDATE
Question : A motor is connected L1 to T1, L2 to T2, and
L3 to T3. To reverse the motor, the leads need to be connected _____.
CORRECT ANSWER : L1 to T3, L2 to T2, and L3 to T1
Question : A motor overload relay consists of a current-
sensing unit and a mechanism activated by the sensing unit that _____.
CORRECT ANSWER : opens the motor circuit
Question : A shading coil is used to _____.
CORRECT ANSWER : prevent contact chatter
Question : A single-pushbutton contact can be used to
control the sequence of operation of several loads by using a _____.
CORRECT ANSWER : multi-pole relay
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Question : An opto-isolated solid state relay is activated
by _____.
CORRECT ANSWER : light
Question : Contacts that are apart when the relay is de-
energized are said to be _____.
CORRECT ANSWER : normally open
Question : If contactor action is dependent on current
flow, the contactor is described as _____.
CORRECT ANSWER : electrically held
Question : Increasing the armature spring force in a relay
will result in _____.
CORRECT ANSWE R: higher drop-out values
Question : Low-voltage remote control switching relays
_____.
CORRECT ANSWER : use a split low-voltage coil
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Question : Mechanically held relays and contactors are
often used in auditoriums because _____.
CORRECT ANSWER : they are quieter than electrically
held devices
Question : Power to operate low-voltage switching
systems is supplied by _____.
CORRECT ANSWER : a transformer
Question : The lubrication of a large industrial motor at
prescribed intervals can be accomplished using a _____.
CORRECT ANSWER : timing relay
Question : The overload relays in machines associated
with continuous processing typically activate a(n) _____.
CORRECT ANSWER : alarm circuit
Question : The panel for a low-voltage lighting control
system enclosure should be mounted _____.
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CORRECT ANSWER : at eye level between two studs
Question : The symbol shown in the figure provided is
used to denote a low-voltage _____.
CORRECT ANSWER : transformer
Question : The two classifications of overload relays are
thermal and _____.
CORRECT ANSWER : magnetic
Question : Which of the following is a nonrenewable
device?
CORRECT ANSWER : Time-delay fuse
Question : Which of the following is a probable cause of
relay-controlled equipment failing to start when the contactor is closed?
