NCCER 26211-20 Test Questions with Answers

NCCER 26211 -20 Test Questions with Answers A motor is connected L1 to T1, L2 to T2, and L3 to T3. To reverse the m otor, 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 u sed 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 forc e 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 p anel 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