EPRI EE Exam Questions and Answers
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Power= - ✔✔voltage*current
What is a battery - ✔✔an energy storage device that converts chemical energy to electricity when power
is needed
What is the preferred power source at a nuclear plant - ✔✔off site power (power from the grid)
What are the four parts to a simple circuit - ✔✔voltage source, conductor, control device, load
example of voltage source - ✔✔outlet or battery
example of conductor - ✔✔wire
example of control device - ✔✔switch
example of load - ✔✔light bulb
unit for current - ✔✔amps
unit for resistance - ✔✔ohms
unit for power - ✔✔watts
unit for frequency - ✔✔hertz
What are the two types of current? - ✔✔direct and alternating
Where is AC power typically provided from? - ✔✔generators, frequency of 60 Hz
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Where does DC power come from? - ✔✔batteries
How is AC and DC power equated? - ✔✔RMS
RMS= - ✔✔AC peak value/square root 2
What are RMS values used in AC circuits for - ✔✔voltage and current values
power unit of choice for motors - ✔✔HP
power unit used when it gets larger - ✔✔KW or MW
what is power rating based on - ✔✔nominal voltage
What is voltage drop - ✔✔the losses across the elements in a circuit. the difference between the source
voltage and that available to the load
Ohms law - ✔✔V=IR
Kirchoff's current law - ✔✔the sum of current at any node in a circuit equals zero
Kirchoff's voltage law - ✔✔the sum of the voltages across the different elements in any closed loop equals
zero
purpose of a large power system - ✔✔it is not practical/cost effective to transfer energy from a generating
station directly to your house
power from the plant is delivered to the grid via the - ✔✔switchyard
what serves as the offsite power source when the unit is shutdown - ✔✔the switchyard
Three phase power, P= - ✔✔V*I*square root 3
what typically supplies power when a nuclear plant is in operation - ✔✔main generator
where does the net output of the unit go - ✔✔the grid
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