Exam (elaborations)
CM 411 Midterm
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Exam of 5 pages for the course RAD at RAD (CM 411 Midterm)
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CM 411 MidtermAssume that you have a series of circuit with forty-eight, 10 ohm lights connected
to a 120 volt source. The voltage (in volts) across each light is: - CORRECT
ANSWER-2.5
Assume that you have a series of circuit with forty-eight, 10 ohm lights connected
to a 120 volt source. The total current flow (in amps) through the circuit is: -
CORRECT ANSWER-0.25
Which of the following electrical circuit arrangements is most common in
buildings: - CORRECT ANSWER-parallel circuit
Assume that each of the two units at Diablo Canyon Power Plant is capable of
producing 1,200 MW. Also assume that a home uses only 10 amps of current at
120 volts on average due to load diversity. The number of homes that each unit
at Diablo Canyon can power is: - CORRECT ANSWER-1,000,000
Disadvantages of a low power factor include: - CORRECT ANSWER-Additional
generation is required and the utility company could impose a penalty
The name of the type of diagram that shows he main distribution of power is: -
CORRECT ANSWER-single line diagram
Assume you have a parallel circuit with a 240 watt light fixture, a 600 watt
exhaust fan, and a 360 watt television all connected to a 120 volt source. The
current (in amps) through the exhaust fan is: - CORRECT ANSWER-5
Assume you have a parallel circuit with a 240 watt light fixture, a 600 watt
exhaust fan, and a 360 watt television all connected to a 120 volt source. The
total current (in amps) flowing through the circuit is: - CORRECT ANSWER-10
One reason why power is transmitted at higher voltages is: - CORRECT
ANSWER-smaller diameter wire may be used
, For smaller sized wire, as the physical size increases the AWG number: -
CORRECT ANSWER-gets smaller
For larger sized wire, as the physical size increases the kcmil number: -
CORRECT ANSWER-gets bigger
What is the correct order of the following equipment as shown on a single line
diagram? 1). 120/208 V panel board, 2). utility service entrance cable, 3). 225A
breaker for panel, 5). 480 V main switchboard, 6). 400A main switchboard
breaker, 7). panelboard feeder - CORRECT ANSWER-2-5-6-4-7-1-3
From your site plan reading exercise, where is the building transformer located? -
CORRECT ANSWER-Inside the building, in a separate enclosure from the main
distribution equipment
From your site plan reading assignment, what was the minimum burial depth
indicated on the drawings for the power conduits? - CORRECT ANSWER-None
of these are correct
_____ is the joining of two or more electrical conductors by using a special
compression device. - CORRECT ANSWER-splicing
Assume that you come in contact with a 120 V electrical circuit. The minimum
contact resistance (in ohms) to prevent a fatal (six milliamperes,or 0.006 amps)
shock is: - CORRECT ANSWER-20,000
Assume that you come in contact with a 120 V electrical circuit. The current (in
milliamps) with the above voltage through wet (contact resistance of 1,000 ohms)
hands is: - CORRECT ANSWER-120
A _______ is a round indentation punched into the metal of a box and held in
place by unpunched narrow strips of metal. - CORRECT ANSWER-knockout
What type of lighting fixture would you specify if you wanted the lowest installed
cost? - CORRECT ANSWER-incandescent
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