NCCER 26211-20|Questions With Correct Answers|Verified
A Motor is Connected - ✔L1 to T1, L2 to T2, and L3 to T3. To Reverse the Motor,
Connect Leads: L1 to T3, L2 to T2, and L3 to T1
A Motor Overload Relay Consists of - ✔Current-sensing Unit and a Mechanism
Activated by the Sensing Unit that Opens the Motor Circuit
A Shading Coil is Used to - ✔Prevent Contact Chatter
A Single-pushbutton Contact Can Control the Sequence of Operation of Several Loads
Using a - ✔Multi-pole Relay
An Opto-isolated Solid State Relay is Activated by - ✔Light
Contacts Apart When Relay is De-energized are - ✔Normally Open
Contactor Action Dependent on Current Flow Describes a - ✔Electrically Held Contactor
Increasing Armature Spring Force in a Relay Results in - ✔Higher Drop-out Values
Low-voltage Remote Control Switching Relays Use - ✔Split Low-voltage Coil
Mechanically Held Relays and Contactors are Quieter Than Electrically Held Devices
and Often Used in Auditoriums Because - ✔Quieter Operation
Power Supply for Low-Voltage Switching Systems - ✔transformer
Lubrication Timing for Large Industrial Motors - ✔timing relay
Overload Relay Activation in Continuous Processing Machines - ✔alarm circuit
Mounting Location for Low-Voltage Lighting Control Panel - ✔at eye level between two
studs
Symbol for Low-Voltage Equipment - ✔transformer
Classifications of Overload Relays - ✔magnetic
Nonrenewable Device Type - ✔Time-delay fuse
Probable Cause of Relay-Controlled Equipment Failure - ✔One contact not closing
A Motor is Connected - ✔L1 to T1, L2 to T2, and L3 to T3. To Reverse the Motor,
Connect Leads: L1 to T3, L2 to T2, and L3 to T1
A Motor Overload Relay Consists of - ✔Current-sensing Unit and a Mechanism
Activated by the Sensing Unit that Opens the Motor Circuit
A Shading Coil is Used to - ✔Prevent Contact Chatter
A Single-pushbutton Contact Can Control the Sequence of Operation of Several Loads
Using a - ✔Multi-pole Relay
An Opto-isolated Solid State Relay is Activated by - ✔Light
Contacts Apart When Relay is De-energized are - ✔Normally Open
Contactor Action Dependent on Current Flow Describes a - ✔Electrically Held Contactor
Increasing Armature Spring Force in a Relay Results in - ✔Higher Drop-out Values
Low-voltage Remote Control Switching Relays Use - ✔Split Low-voltage Coil
Mechanically Held Relays and Contactors are Quieter Than Electrically Held Devices
and Often Used in Auditoriums Because - ✔Quieter Operation
Power Supply for Low-Voltage Switching Systems - ✔transformer
Lubrication Timing for Large Industrial Motors - ✔timing relay
Overload Relay Activation in Continuous Processing Machines - ✔alarm circuit
Mounting Location for Low-Voltage Lighting Control Panel - ✔at eye level between two
studs
Symbol for Low-Voltage Equipment - ✔transformer
Classifications of Overload Relays - ✔magnetic
Nonrenewable Device Type - ✔Time-delay fuse
Probable Cause of Relay-Controlled Equipment Failure - ✔One contact not closing
