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
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
