Flashcards
Electrical Equiptment (Part 2)
Cards in this deck (18)
- 1Name three general functions of electrical devices.To control the current to a load
To protect a circuit or a load
To connect a load to the wiring system - 2Can a particular device performmore than one function? If so, give an example.Yes, a circuit breaker can protect a circuit and control a circuit
- 3What’s a triple-pole, single-throwswitch?The term “triple-pole” describes the
number of circuit paths the switch controls, while the term “single-throw” describes the number of switch positions
that will allow the flow of circuit current. - 4In what situation would a three-way switch be used?A three-way switch would be used
where control of a load is required from
more than one location. - 5What’s a T-rated switch?A T-rated switch (so named because of
the tungsten used in the manufacture of
the filament) is a switch that can be used
to control incandescent lamps. - 6What’s the maximum number of despard-type switches that can bemounted in a standard electrical device box?Three
- 7Name six methods by which automatic switches are operated.a solid moving object
a float
temperature
light
pressure
time - 8If youwant to stop a pump from running when thewater level reaches a certain point, what type of switchwould you normally use?A liquid level or float switch
- 9Name three types of temperature-controlled switches.Bimetallic
hydraulic
gas-filled - 10Name the two types of time-operated switches.interval timer
clock-type timer - 11What electrical devicewould you use to change an AC source to a different voltage level?A transformer
- 12Wherewould you bemost likely to install a transformer for a doorbell circuit?On the service entrance panelboard
- 13What is a contactor?A relay that’s designed to
control and carry large amounts of
current. - 14What are the two basicmethods by which relays function?thermally or magnetically.
- 15What’s the disadvantage of using a latching relay?In most cases, you can’t tell whether the
contacts of a latching relay are open or
closed. - 16Why is a control drawing also called a ladder diagram?Because the component symbols are
organized like rungs on a ladder - 17On a control drawing,what’s indicated by the bar under the rung location for a set of relay contacts?A normally closed relay contact on that
rung - 18What symbol would you find next to the contacts of a timer that are normally closed, and then remain open for two following sequences of operation?The symbol COO
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- Flashcards on Electrical Equiptment (Part 2), created by circuitconnect12 on 30/03/2015.
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