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  • SUMMARY REVIEW OF UNITS 16–19

Electricity 1: Devices, Circuits and Materials

Thomas Kubala

Chapter 20

SUMMARY REVIEW OF UNITS 16–19 - all with Video Answers

Educators

Chapter Questions

Problem 1

In items 1 through 13, Fill in the word(s) that will make the statement correct.
The device that is used to close and open a bell circuit is the __________

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Problem 2

Fill in the word(s) that will make the statement correct.
The most practical type of switch to use for controlling a group of lights from one location is the __________

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Problem 3

Fill in the word(s) that will make the statement correct.
The type of switch used to control a group of lights from two locations is the __________

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Problem 4

Fill in the word(s) that will make the statement correct.
The type of switch that must be used together with three-way switches to control a group of lights from three or more locations is the __________

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Problem 5

Fill in the word(s) that will make the statement correct.
When a bell is to be operated by several pushbuttons, the pushbuttons must be wired with respect to one another in __________

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Problem 6

Fill in the word(s) that will make the statement correct.
Nonmetallic-sheathed cable must be supported by staples within a certain distance from the box. That distance is __________

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Problem 7

Fill in the word(s) that will make the statement correct.
Armored cable must be supported by straps or staples at intervals not to exceed __________

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Problem 8

Fill in the word(s) that will make the statement correct.
Referring to wiring materials, the letters EMT mean __________

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Problem 9

Fill in the word(s) that will make the statement correct.
The antishort bushing is used for the type of cable called __________

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Problem 10

Fill in the word(s) that will make the statement correct.
The type of switch used to open both conductors of a circuit at the same time is a __________

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Problem 11

Fill in the word(s) that will make the statement correct.
The type of conduit sometimes called Greenfield cable is __________

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Problem 12

Fill in the word(s) that will make the statement correct.
The name for the type of fitting that is used for rigid conduit is the __________

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Problem 13

Fill in the word(s) that will make the statement correct.
The inside diameter of a conduit is used to specify the trade__________

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Problem 14

In items 14 through 20, Select the best answer to make the statement true, and place the letter of the answer in the space provided.
An end bushing is used for __________
a. flexible steel conduit.
b. armored cable.
c. nonmetallic-sheathed cable.
d. conduits.
e. rigid conduit.

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Problem 15

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
Door chimes __________
a. are not used much anymore.
b. require greater capacity transformers than those used for bells and buzzers.
c. are only available as two-note devices.
d. require transformers with less capacity as compared to transformers used with bells and buzzers.
e. require low-voltage relays with $120-\mathrm{V}$ contacts.

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Problem 16

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
One area where armored cable cannot be used is __________
a. underground.
b. embedded in the plaster finish on masonry walls.
c. in a concealed dry location.
d. inside a building, but in the open in a dry location.
e. through walls and partitions.

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Problem 17

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
Surface metal raceway __________
a. cannot be used around corners.
b. is neat in appearance.
c. is relatively large in size.
d. is used in hazardous locations.
e. is used in concealed locations.

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Problem 18

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
The type of switch used in remote control systems is a single-pole, double-throw switch, and is
a. normally closed.
b. a two-terminal switch.
c. a momentary contact switch.
d. energized by a relay.
e. sometimes used in 120 -volt circuits.

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Problem 19

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
Electrical metallic tubing, sometimes called thinwall conduit,
a. utilizes compression couplings.
b. may be used in any application where rigid galvanized conduit is used.
c. can be bent with as small a radius as desired.
d. has threads cut at the ends to secure fittings.
e. is heavy compared to black-enameled conduit.

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Problem 20

Select the best answer to make the statement true, and place the letter of the answer in the space provided.
In remote control circuits,
a. fuses are required in the low-voltage portion.
b. lights may be controlled from any number of switch locations.
c. the transformer may be of any volt-ampere rating.
d. the transformer should be designed so that when overloaded, the output voltage increases.
e. the number of transformers required is directly proportional to the number of lights to be controlled.

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Problem 21

With the devices shown in Figure 20-1, draw a wiring diagram showing the proper connections for a single-family dwelling.
FIGURE CAN'T COPY.

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Problem 22

In Figure 20-2, the pushbutton in Plant A will operate the buzzer in Plant B. The pushbutton in Plant B will operate the bell in Plant A. Only one source of supply is available and only three wires may be used between the two plants. Complete this wiring diagram.
FIGURE CAN'T COPY.

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Problem 23

Show the connections for a ceiling outlet that is to be controlled from either of two switch locations in Figure 20-3. The 120-volt feed is at the light. Be sure to color code all wires.
FIGURE CAN'T COPY.

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Problem 24

Using the devices shown in Figure 20-4, light L1 is to be controlled from one control point, and light L2 is to be controlled from two control points. One transformer is to be used. Draw the wiring diagram that will accomplish the necessary control.
FIGURE CAN'T COPY.

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