Electrical – EPRI Exam with verified detailed answers ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
What is the formula for Ohm's Law? - correct answer✔✔V = IR
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What is the unit for resistance? - correct answer✔✔Ohm
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What is the formula for power? - correct answer✔✔P = VI
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What is the unit for power? - correct answer✔✔Watt
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What alternates in AC? What frequency? - correct answer✔✔Current and Voltage
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60 Hz ||\\|//||
How does AC relate to DC? - correct answer✔✔RMS = AC peak value/sqrt(2)
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What kind of voltage is the power rating based on? - correct answer✔✔Nominal Voltage
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For resistance type loads, current drops in ______ _________ to the voltage? - correct
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answer✔✔Direct Proportion ||\\|//||
What does Kirchoff's Current Law state? - correct answer✔✔Sum of currents at any node
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in a circuit equals zero.
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What does Kirchoff's Voltage Law state? - correct answer✔✔Sum of the voltages across
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different elements in any closed loop equals zero. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
, Three phase voltage is represented by what kind of wave? How many degrees are the
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phases apart? - correct answer✔✔Sine Wave ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
120 degrees ||\\|//||
What is formula for output power of the generator? - correct answer✔✔P = V*I*sqrt(3)
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What form of power do most homes have? - correct answer✔✔120/240 V single phase
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What is real power? What is the unit? - correct answer✔✔Relates to the energy used or
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lost across resistive elements or loads.
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Watts
What is reactive power? What is the unit? - correct answer✔✔Relates to the energy stored
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in or released from a capacitor or inductor or inductive elements such as windings of a
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transformer or motor. ||\\|//|| ||\\|//||
VARs - Volt Amperes Reactive ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
What is apparent power? - correct answer✔✔The vectoral sum of the true (or real) power
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and reactive power. ||\\|//|| ||\\|//||
What is power factor? - correct answer✔✔Ratio of real power to apparent power and is a
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value greater than or equal to 0 (totally capacitive or inductive load) and less than or equal
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to 1 (totally resistive load).
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In other words, power factor = cosine of theta
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When a generator is on-line, it is boosting voltage to help support grid operations which
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also means what? - correct answer✔✔The generator is supplying VARs to compensate for
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losses on the grid. ||\\|//|| ||\\|//|| ||\\|//||
What is the formula for Ohm's Law? - correct answer✔✔V = IR
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What is the unit for resistance? - correct answer✔✔Ohm
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What is the formula for power? - correct answer✔✔P = VI
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What is the unit for power? - correct answer✔✔Watt
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What alternates in AC? What frequency? - correct answer✔✔Current and Voltage
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60 Hz ||\\|//||
How does AC relate to DC? - correct answer✔✔RMS = AC peak value/sqrt(2)
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What kind of voltage is the power rating based on? - correct answer✔✔Nominal Voltage
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For resistance type loads, current drops in ______ _________ to the voltage? - correct
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answer✔✔Direct Proportion ||\\|//||
What does Kirchoff's Current Law state? - correct answer✔✔Sum of currents at any node
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in a circuit equals zero.
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What does Kirchoff's Voltage Law state? - correct answer✔✔Sum of the voltages across
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different elements in any closed loop equals zero. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
, Three phase voltage is represented by what kind of wave? How many degrees are the
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phases apart? - correct answer✔✔Sine Wave ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
120 degrees ||\\|//||
What is formula for output power of the generator? - correct answer✔✔P = V*I*sqrt(3)
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What form of power do most homes have? - correct answer✔✔120/240 V single phase
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What is real power? What is the unit? - correct answer✔✔Relates to the energy used or
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lost across resistive elements or loads.
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Watts
What is reactive power? What is the unit? - correct answer✔✔Relates to the energy stored
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in or released from a capacitor or inductor or inductive elements such as windings of a
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transformer or motor. ||\\|//|| ||\\|//||
VARs - Volt Amperes Reactive ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||
What is apparent power? - correct answer✔✔The vectoral sum of the true (or real) power
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and reactive power. ||\\|//|| ||\\|//||
What is power factor? - correct answer✔✔Ratio of real power to apparent power and is a
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value greater than or equal to 0 (totally capacitive or inductive load) and less than or equal
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to 1 (totally resistive load).
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In other words, power factor = cosine of theta
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When a generator is on-line, it is boosting voltage to help support grid operations which
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also means what? - correct answer✔✔The generator is supplying VARs to compensate for
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losses on the grid. ||\\|//|| ||\\|//|| ||\\|//||
