NCCER Electrical level 2 Module 11 'Control
systems and Fundamental Concepts'- Qs & As
The maximum tungsten/infrared load amperage for a NEMA Size 0 magnetic contactor is ___.
Correct Ans-10A
A manual reversing starter uses ___. Correct Ans-a mechanical interlock
Mechanically held relays would most likely be used in a ___. Correct Ans-hospital,
auditoriums, churches
A single-contact device can be used to control multiple loads using a ___. Correct Ans-
multiple-pole relay
A furnace might use an on delay to ___. Correct Ans-avoid blowing cold air into the space
when the system starts up
A type of relay controlled by a magnetic field is a(n) ___. Correct Ans-reed relay
A type of renewable overload device is a ___. Correct Ans-melting alloy relay
The operating coil of a relay is designed to work properly at ___. Correct Ans-80% to 110%
of the rated voltage
, A device that allows relays to be controlled as a group while still allowing individual switch
control is a ___. Correct Ans-master sequencer
Where low-voltage cable must be run parallel with high-voltage cable, it should be separated by
minimum of ___. Correct Ans-6" (150mm)
The function of a shading coil in a contactor is to ___. Correct Ans-prevent contact chatter
and hum
What is the major difference between a contactor and a motor starter? Correct Ans-The starter
provides overload protection while a contactor does not.
The approximate inrush current of filament-type lamps is how many times the normal operating
current? Correct Ans-15 to 17
The maximum tungsten/infrared load amperage for a NEMA Size 2 magnetic contactor at 230V
is ___. Correct Ans-30A
The maximum tungsten/infrared load amperage for a NEMA Size 00 magnetic contactor at 230V
is ___. Correct Ans-5A
Which of the following best describes a control relay? Correct Ans-An electromagnetic
device used in control circuits
systems and Fundamental Concepts'- Qs & As
The maximum tungsten/infrared load amperage for a NEMA Size 0 magnetic contactor is ___.
Correct Ans-10A
A manual reversing starter uses ___. Correct Ans-a mechanical interlock
Mechanically held relays would most likely be used in a ___. Correct Ans-hospital,
auditoriums, churches
A single-contact device can be used to control multiple loads using a ___. Correct Ans-
multiple-pole relay
A furnace might use an on delay to ___. Correct Ans-avoid blowing cold air into the space
when the system starts up
A type of relay controlled by a magnetic field is a(n) ___. Correct Ans-reed relay
A type of renewable overload device is a ___. Correct Ans-melting alloy relay
The operating coil of a relay is designed to work properly at ___. Correct Ans-80% to 110%
of the rated voltage
, A device that allows relays to be controlled as a group while still allowing individual switch
control is a ___. Correct Ans-master sequencer
Where low-voltage cable must be run parallel with high-voltage cable, it should be separated by
minimum of ___. Correct Ans-6" (150mm)
The function of a shading coil in a contactor is to ___. Correct Ans-prevent contact chatter
and hum
What is the major difference between a contactor and a motor starter? Correct Ans-The starter
provides overload protection while a contactor does not.
The approximate inrush current of filament-type lamps is how many times the normal operating
current? Correct Ans-15 to 17
The maximum tungsten/infrared load amperage for a NEMA Size 2 magnetic contactor at 230V
is ___. Correct Ans-30A
The maximum tungsten/infrared load amperage for a NEMA Size 00 magnetic contactor at 230V
is ___. Correct Ans-5A
Which of the following best describes a control relay? Correct Ans-An electromagnetic
device used in control circuits
