NCCER 26211-20 | Questions and Verified Solutions Latest Update
A 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 The panel for a low-voltage lighting control system enclosure should be mounted _____. - Answer -at eye level between two studs The symbol shown in the figure provided is used to denote a low-voltage _____. - Answer -transformer The two classifications of overload relays are thermal and _____. - Answer -magnetic Which of the following is a nonrenewable device? - Answer -Time-delay fuse
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