CM 411 Exam 1 Flashcards Cal Poly CM
411 Electrical Midterm
Assume that you have a 120 volt circuit with 2 lights (of equal resistance)
connected in a series. What is the voltage across each light? - CORRECT
ANSWER-60
Assume that you have a 120 volt circuit with 2 lights (of equal resistance)
connected in parallel. What is the voltage across each light? - CORRECT
ANSWER-120
An Ohm is an electrical unit that measures - CORRECT ANSWER-resistance
Watts are an electrical unit that measures - CORRECT ANSWER-power
The power formula is useful when determining expected ________ values
because most electrical equipment lists a voltage and power rating - CORRECT
ANSWER-current
Power and energy differ as follows: - CORRECT ANSWER-power is
instantaneous, while energy is time dependent
The difference between a cable and a wire is: - CORRECT ANSWER-a cable is
an assembly of wires
Assuming the same type of insulation, which wire has a larger diameter? -
CORRECT ANSWER-500 kcmil
Assuming the same type of insulation, which wire can carry more current? -
CORRECT ANSWER-500 kcmil
The "14" in a cable marked "14/2" indicates: - CORRECT ANSWER-the size of
the wire
, Electrical device boxes can be ______ shaped - CORRECT ANSWER-square,
octagonal, or rectangular
Once installed, receptacle boxes in walls can be completely permanently covered
for appearance - CORRECT ANSWER-False
The size of an outlet box is based upon the location of the outlet box -
CORRECT ANSWER-False
______ is the joining of two or more electrical conductors by mechanically
twisting the conductors together or by using a special splicing device -
CORRECT ANSWER-Splicing
Panelboard circuit breakers can provide good protection in the event you touch
an energized circuit - CORRECT ANSWER-False
What type of lighting fixture would you specify if you wanted the best color
rendition? - CORRECT ANSWER-LED
What type of lighting fixture would you specify if you wanted the longest lamp
life? - CORRECT ANSWER-Mercury Vapor
What type of lighting fixture would you specify if you wanted the best overall
combination of cost, efficiency, color rendition, and life? - CORRECT
ANSWER-Fluorescent
What term is used as a measure of light energy? - CORRECT ANSWER-Lumen
What feature is performed by a lighting ballast? - CORRECT ANSWER-All of
these are true:
Provide a high voltage to start the arc
Provides a built-in power factor correction
Maintain the voltage to stabilize the arc
regulate the current passing through the arc
A ballast is required for correct operation of: - CORRECT ANSWER-Fluorescent
lamps and HID lamps
411 Electrical Midterm
Assume that you have a 120 volt circuit with 2 lights (of equal resistance)
connected in a series. What is the voltage across each light? - CORRECT
ANSWER-60
Assume that you have a 120 volt circuit with 2 lights (of equal resistance)
connected in parallel. What is the voltage across each light? - CORRECT
ANSWER-120
An Ohm is an electrical unit that measures - CORRECT ANSWER-resistance
Watts are an electrical unit that measures - CORRECT ANSWER-power
The power formula is useful when determining expected ________ values
because most electrical equipment lists a voltage and power rating - CORRECT
ANSWER-current
Power and energy differ as follows: - CORRECT ANSWER-power is
instantaneous, while energy is time dependent
The difference between a cable and a wire is: - CORRECT ANSWER-a cable is
an assembly of wires
Assuming the same type of insulation, which wire has a larger diameter? -
CORRECT ANSWER-500 kcmil
Assuming the same type of insulation, which wire can carry more current? -
CORRECT ANSWER-500 kcmil
The "14" in a cable marked "14/2" indicates: - CORRECT ANSWER-the size of
the wire
, Electrical device boxes can be ______ shaped - CORRECT ANSWER-square,
octagonal, or rectangular
Once installed, receptacle boxes in walls can be completely permanently covered
for appearance - CORRECT ANSWER-False
The size of an outlet box is based upon the location of the outlet box -
CORRECT ANSWER-False
______ is the joining of two or more electrical conductors by mechanically
twisting the conductors together or by using a special splicing device -
CORRECT ANSWER-Splicing
Panelboard circuit breakers can provide good protection in the event you touch
an energized circuit - CORRECT ANSWER-False
What type of lighting fixture would you specify if you wanted the best color
rendition? - CORRECT ANSWER-LED
What type of lighting fixture would you specify if you wanted the longest lamp
life? - CORRECT ANSWER-Mercury Vapor
What type of lighting fixture would you specify if you wanted the best overall
combination of cost, efficiency, color rendition, and life? - CORRECT
ANSWER-Fluorescent
What term is used as a measure of light energy? - CORRECT ANSWER-Lumen
What feature is performed by a lighting ballast? - CORRECT ANSWER-All of
these are true:
Provide a high voltage to start the arc
Provides a built-in power factor correction
Maintain the voltage to stabilize the arc
regulate the current passing through the arc
A ballast is required for correct operation of: - CORRECT ANSWER-Fluorescent
lamps and HID lamps
