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WMGT 101 Exam 5 Questions with
Detailed Verified Answers
Circuit ampacity Ans: The maximum current (in A) that a conductor can carry
continuously under the conditions of use without exceeding it temperature
rating
American wire gauge Ans: Conductor sizes that do not directly correlated to
cross-sectional area: #16, #14, #12, #10, #8, #6, #4, #3, #2, #1, #1/0, #2/0,
#3/0, #4/0
Thousands circular mils Ans: Conductor sizes that are a measurement of area:
250 MCM, 300 MCM, 350 MCM, 400 MCM, 500 MCM
Current-carrying material Ans: Copper or aluminum
Material that determines temperature rating Ans: Insulation
Relationship between circuit load, circuit ampacity, equipment rating, and
protective device rating Ans: Circuit load < OCPD <= Circuit Ampacity
Voltage drop Ans: Loss of power from the system in the form of heat as
current moves along the conductors. Influenced by current, nominal voltage,
conductor impedance, and circuit length
Purposes of electrical grounding Ans: 1. Provide a low impedance path for
ground faults, resulting in high levels of fault current that will trip an OCPD
2. To limit voltages imposed by lightning and surges
3. To establish a stable reference for all normal voltages
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Sources of primary energy Ans: 1. Natural gas
2. Petroleum
3. Coal
4. Nuclear
5. Renewables
Power plant Ans: Converts sources of primary energy into usable power
Transmission lines Ans: Carry power from power plant to substation. Owned
by utility. High voltage (69 - 500 kV)
Substation Ans: Reduces voltage from transmission lines and delivers power
to installation. May be owned by utility or installation
Distribution lines Ans: Carry power from substation to feeder/distribution
transformer. Medium voltage (4.16 kV - 34.5 kV)
Feeder Ans: Reduces voltage a final time before it is carried to distribution
transformer
Distribution transformer Ans: Delivers power to individual facilities. Low
voltage (480/277 V or 208/120 V)
Loop distribution system Ans: Two feeders are connected by a switch that is
normally open, but can be closed in case one section goes down so that
power can be restored to all surrounding sections vs only preceding sections.
WMGT 101 Exam 5 Questions with
Detailed Verified Answers
Circuit ampacity Ans: The maximum current (in A) that a conductor can carry
continuously under the conditions of use without exceeding it temperature
rating
American wire gauge Ans: Conductor sizes that do not directly correlated to
cross-sectional area: #16, #14, #12, #10, #8, #6, #4, #3, #2, #1, #1/0, #2/0,
#3/0, #4/0
Thousands circular mils Ans: Conductor sizes that are a measurement of area:
250 MCM, 300 MCM, 350 MCM, 400 MCM, 500 MCM
Current-carrying material Ans: Copper or aluminum
Material that determines temperature rating Ans: Insulation
Relationship between circuit load, circuit ampacity, equipment rating, and
protective device rating Ans: Circuit load < OCPD <= Circuit Ampacity
Voltage drop Ans: Loss of power from the system in the form of heat as
current moves along the conductors. Influenced by current, nominal voltage,
conductor impedance, and circuit length
Purposes of electrical grounding Ans: 1. Provide a low impedance path for
ground faults, resulting in high levels of fault current that will trip an OCPD
2. To limit voltages imposed by lightning and surges
3. To establish a stable reference for all normal voltages
, 2|Page
Sources of primary energy Ans: 1. Natural gas
2. Petroleum
3. Coal
4. Nuclear
5. Renewables
Power plant Ans: Converts sources of primary energy into usable power
Transmission lines Ans: Carry power from power plant to substation. Owned
by utility. High voltage (69 - 500 kV)
Substation Ans: Reduces voltage from transmission lines and delivers power
to installation. May be owned by utility or installation
Distribution lines Ans: Carry power from substation to feeder/distribution
transformer. Medium voltage (4.16 kV - 34.5 kV)
Feeder Ans: Reduces voltage a final time before it is carried to distribution
transformer
Distribution transformer Ans: Delivers power to individual facilities. Low
voltage (480/277 V or 208/120 V)
Loop distribution system Ans: Two feeders are connected by a switch that is
normally open, but can be closed in case one section goes down so that
power can be restored to all surrounding sections vs only preceding sections.
