Switching Circuits
A second door chime is to be installed in a residence. The solenoid coils of the second unit are connected in series with those of the first unit. True or false?
False.
According to the CEC, 347 V switches can be installed in standard outlet boxes. True or false?
False.
The switching action of a three-way switch is exactly the same of that of a single pole double throw, three position switch. True or false?
False.
The switching arrangement of a double pole single throw switch is the same as that of a four-way switch. True or false?
False.
What is a schematic diagram?
A schematic diagram is a graphic representation of a circuit showing the logical sequence of operation of the circuit components.
Four-way switches can be used to operate the light from either of two locations. True or false?
True.
There is no standardization of symbols that represent electrical components in electrical control circuits and there only generally accepted symbols. When examining the schematic with an unusual or unknown simple, you should consult the symbol legend for that drawing. True or false?
True.
What is the maximum number of circuits a two pole switch can control?
Two.
If an electrician wanted to understand the sequence of operation of a piece of electrical equipment, the drawing he would likely request would be a:
schematic diagram.
Wiring diagrams:
show the electrical interconnection of the components in their relative physical location.
When one load conductor is to be switch, a __ switch would be used.
single pole
One of the differences between a wiring diagram and a schematic diagram is that:
the wiring diagram shows the interconnection of components and the relative physical location but the schematic diagram does not.
When testing a three-way switch, there will be continuity between __ terminals at any given time.
2
The applications for double pole switches.
240 V heaters, air conditioners, appliances, and single phase 240 V motors.
What is a wiring diagram?
A wiring diagram is a graphic representation of a circuit displaying the relative physical location of the components and their interconnections.
Which conductor should be connected to the silver screw on a duplex receptacle?
Identified conductor.
The applications for multiposition switches.
Lamps with tri-light bulbs and multispeed ceiling fans.
The applications for single pole switches.
Lighting circuits, fractional horsepower motors, appliances and power tools.
The pushbuttons for a doorbell circuit are __ pushbuttons.
NO
Are both of the travelers in an energized three-way switching circuit usually live at the same time?
No.
A three-way switch is a __ switch. A three-way switch is used to switch lighting circuits on or off from __ separate locations.
SPDT, two.
What type of electrical drawing is intended to show electrical sequence of operation?
Schematic diagram.
Which conductor should be connected to the brass screw of a lampholder in a switched circuit?
Switched leg.
The applications for four-way switches.
Switching circuits from more than two locations.
The applications for three way switches.
Switching circuits from two locations.
A newly installed 16 V doorbell circuit engages the correct solenoid coil, but the plungers of the door chime do not strike the chimes plate with enough force to be heard very well. What might the problem be?
The door chime is connected to the 8 V output of the multi-voltage class two transformer.
The front and rear pushbuttons a doorbell circuit have been connected in series. Which of the following best describes how the circuit operates?
The door chime only works if both push buttons are engaged at the same time.
One way to classify switches is by the connections they make. What are the two factors that determine what types of connections a switch makes?
The number of poles and throws.
What state are normally open contact of a float switch in when the water tank is empty?
They are in the open position.
The applications for three pole switches.
Three-phase motors, panelboards and other three-phase equipment.
What is the common name given to the two wires that connect three-way or four-way switches together?
Travellers.
A double pole double throw switch has six terminals. True or false?
True.
A three-way switch can be used to replace a single pole switch, provided that on indication is not required for the application. True or false?
True.
A three-way switch is a single pole double throw switch having only two positions. True or false?
True.
On a temporary basis, a four-way switch can be used as:
a) a three-way switch b) a S.P.D.T. (Two position) switch
If a digital meter beeps and said for checking continuity well the pool leads are across two terminals, the terminals are:
connected.
If an ohmmeter reads zero ohms across two terminals, the terminals are:
connected.
When and ohmmeter indicated 0 ohms it could be stated that there is __ between the terminals that are being tested.
continuity
When two load conductors are to be switched a __ switch would be used.
double pole
Schematic diagrams are also referred to as:
elementary diagrams.
When using and ohmmeter to verify the terminals of a four way switch, there will be continuity between one terminal and a total of __ other terminals when the switch has been placed in both of its positions.
two
Switches are:
usually connected in series with the device they control.
