Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The function of a(n) ___________ is to show how components in an electrical
system are connected and sometimes where they are located.
a. | specification sheet | c. | NEMA standard | b. | manufacturer’s data
sheet | d. | electrical
print |
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2.
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The four primary components of a ladder diagram are power supply, input devices,
output devices, and ___________.
a. | conductors | c. | push buttons | b. | contactors | d. | fuses |
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3.
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A ladder diagram separates input devices to the ___________ side and output
devices to the __________ side.
a. | right, left | c. | left, right | b. | top, bottom | d. | bottom, top |
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4.
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__________ are used on ladder diagrams to identify the line number that contains
the output coil’s contact.
a. | Wire numbers | c. | Cross-reference numbers | b. | Terminal
numbers | d. | Rung
numbers |
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5.
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Ladder diagrams with multiple pages use _________ and notes to indicate the
previous and next pages.
a. | carets | c. | slashes | b. | colors | d. | arrows |
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6.
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The National Electrical Manufacturer’s Association (NEMA) designates
different enclosure types based on _____________.
a. | maximum voltage | c. | enclosure material | b. | environmental conditions | d. | size |
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7.
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It is good practice to limit the number of connections per terminal block to
________ wires.
a. | one | c. | only two | b. | two or less | d. | three or less |
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8.
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Terminal blocks are installed inside electrical panels in a certain pattern
according to the wiring _________.
a. | voltage rating | c. | length | b. | size | d. | function |
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9.
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Wire numbers attached to wires in an electrical panel should match the wire
numbers shown on the ____________.
a. | Electrical print | c. | Wire manufacturer catalog | b. | Panel
door | d. | components |
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10.
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Wires that run between two panels must enter and exit each panel through
_________.
a. | disconnects | c. | circuit breakers | b. | terminal blocks | d. | wireways |
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11.
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The type of signal that is carried by a wire inside an electrical panel is
indicated by the wire __________.
a. | gauge | c. | insulation color | b. | voltage rating | d. | length |
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12.
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An overcurrent protection device for a motor control circuit operating with a
motor FLA of 20 amps should be sized for at least _________ amps.
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13.
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When testing a circuit breaker in the closed position, the resistance between
the terminals should measure ___________.
a. | infinite resistance | c. | exactly zero ohms | b. | at least 10 ohms | d. | less than 1
ohms |
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14.
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When sizing disconnect switches, the current or voltage rating should _________
the source’s current or voltage.
a. | equal or exceed | c. | exactly match | b. | be less than | d. | be 10% higher |
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Matching
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Segment 1 Matching:
a. | line | d. | notes | b. | arrows | e. | ladder | c. | cross-reference |
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15.
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Most machine electrical prints are in the form of a(n) _________
diagram.
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16.
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_________ are used on electrical prints when a device on one line of a print
has contacts on other lines.
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17.
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A(n) ______ under a number on the right side of a print indicates a normally
closed contact on another line.
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18.
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______ on a print can tell you what operation is being performed by the
components on that line.
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19.
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Electrical prints will include _______ at the top or the bottom to indicate
that it continues to or is continued from another page.
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Segment 2 Matching
a. | motor power leads | d. | end
anchors | b. | control | e. | terminal blocks | c. | DIN rails |
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20.
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A(n) _______ panel contains devices such as motor starters, control relays,
timers and control transformers.
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21.
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________ provide a convenient location for numbering the wires in a panel
according to the electrical print.
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22.
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Larger terminal blocks are used for ________.
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23.
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Terminal blocks are most commonly installed on _________.
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24.
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Retaining clips or _______ are used to prevent the terminal blocks from
slipping.
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Segment 3 Matching
a. | black | d. | starter
coils | b. | signal | e. | control panel | c. | identify |
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25.
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Wire numbers on an electrical print are necessary to ______ the connections
within each panel and the connections between panels.
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26.
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The color of the wire’s insulation can tell you what type of ______ the
wire is carrying.
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27.
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Underground power conductors coming into a panel should have insulation with
the color of ________.
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28.
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Typically, the wires to an operator station come from the _________.
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29.
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Wire numbers are usually not shown between _______ and overload contacts,
because motor starters usually contain them as a single unit.
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a. | less than 1 | d. | 62.5 | b. | phase | e. | 125 | c. | circuit
breaker |
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30.
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Overcurrent protection devices for motor control circuits are rated at _______
% of the full load ampere.
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31.
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After a(n) _______ is tripped, it can be reset and used again.
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32.
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When testing a fuse with a digital multimeter, the measured resistance should
indicate _________ ohm(s).
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33.
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A disconnect switch for a motor control circuit with an FLA of 50 amps must be
sized for at least _______ amps.
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34.
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A fusible disconnect switch includes one fuse for each main
power_______.
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