Exam (elaborations)
NCCER 26211-20 Questions and Answers 2024
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Exam of 2 pages for the course NCCER at NCCER (NCCER 26211-20)
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NCCER 26211-20A motor is connected L1 to T1, L2 to T2, and L3 to T3. To reverse the motor, the leads need to be connected _____. - answer L1 to T3, L2 to T2, and L3 to T1
A motor overload relay consists of a current-sensing unit and a mechanism activated by
the sensing unit that _____. - answer opens the motor circuit
A shading coil is used to _____. - answer prevent contact chatter
A single-pushbutton contact can be used to control the sequence of operation of several
loads by using a _____. - answer multi-pole relay
An opto-isolated solid state relay is activated by _____. - answer light
Contacts that are apart when the relay is de-energized are said to be _____. - answer normally open
If contactor action is dependent on current flow, the contactor is described as _____. - answer electrically held
Increasing the armature spring force in a relay will result in _____. - answer higher drop-out values
Low-voltage remote control switching relays _____. - answer use a split low-voltage coil
Mechanically held relays and contactors are often used in auditoriums because _____. -
answer they are quieter than electrically held devices
Power to operate low-voltage switching systems is supplied by _____. - answer a transformer
The lubrication of a large industrial motor at prescribed intervals can be accomplished using a _____. - answer timing relay
The overload relays in machines associated with continuous processing typically activate a(n) _____. - answer alarm circuit
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