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Epri Practice test with accurate answers

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Epri Practice test with accurate answers

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Epri Practice test with accurate answers

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Epri Practice test with accurate answers ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

If a generator is producing 500 MW and 200 Mvar, is the generator?
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. Leading ||\\|//||

B. Lagging
||\\|//||

C. Underexcited
||\\|//||

D. Dropping - correct answer✔✔B. Lagging
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

What is the IEEE device number for a differential relay? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. 87 ||\\|//||

B. 86 ||\\|//||

C. 67 ||\\|//||

D. 50 - correct answer✔✔A. 87
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

Can a synchronous machine have a negative torque angle? What does
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

this mean? ||\\|//||

A. Yes / the machine is absorbing reactive power
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

B. No / the machine is absorbing active power
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

C. No / the machine is absorbing reactive power
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

D. Yes / the machine is absorbing active power - correct answer✔✔D. Yes / the machine is
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

absorbing active power ||\\|//|| ||\\|//||

A customer load is fed at 120 volts. The customer voltage is doubled
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

while the load magnitude stays the same. What effect does this have on
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

the power losses? ||\\|//|| ||\\|//||

,A. Doubles the losses
||\\|//|| ||\\|//|| ||\\|//||

B. Halves the losses
||\\|//|| ||\\|//|| ||\\|//||

C. Increases the losses by a factor of four
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

D. Decreases the losses by a factor of four - correct answer✔✔D. Decreases the losses by a
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

factor of four ||\\|//|| ||\\|//||

In a DC circuit, a 100 volt battery is connected to both sides of a 2 ohm
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

resistor. What is the current through the resistor and the power usage of ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

the resistor? ||\\|//||

A. 50 amps / 5000 watts
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

B. 40 amps / 80 watts
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

C. 50 amps / 100 watts
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

D. 40 amps / 3200 watts - correct answer✔✔A. 50 amps / 5000 watts
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

The actual voltage is 362 kV on a 345 kV bus. What is the p.u. voltage?
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. 1.0 ||\\|//||

B. 1.05
||\\|//||

C. 1.5 ||\\|//||

D. .95 - correct answer✔✔B. 1.05
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A load has a power factor of 0.9 lagging. If the load draws 100 MVA,
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

what is the MW draw? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. 100 ||\\|//||

B. 90 ||\\|//||

C. 111 ||\\|//||

D. 44 - correct answer✔✔B. 90
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

, Which of the following is NOT a synchronizing variable? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. Phase angle
||\\|//|| ||\\|//||

B. Frequency difference
||\\|//|| ||\\|//||

C. Voltage magnitude difference
||\\|//|| ||\\|//|| ||\\|//||

D. MW flow differential - correct answer✔✔D. MW flow differential
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

In a typical multi-stage steam turbine, the governor control valves control
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

the steam entry to the:
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. high pressure turbine
||\\|//|| ||\\|//|| ||\\|//||

B. intermediate pressure turbine
||\\|//|| ||\\|//|| ||\\|//||

C. low pressure turbine
||\\|//|| ||\\|//|| ||\\|//||

D. crossover - correct answer✔✔A. high pressure turbine
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

The high side of a delta-wye connected transformer is connected to a
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

power system with 199 kV L-G high side voltage. What is the voltage
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

across the winding of the delta transformer? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. 199 kV
||\\|//|| ||\\|//||

B. 230 kV
||\\|//|| ||\\|//||

C. 345 kV
||\\|//|| ||\\|//||

D. 500 kV - correct answer✔✔C. 345 kV
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

Thermal limits are the direct result of? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

A. High torque and power angles
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

B. The thermal capability of system equipment
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

C. A reactive power deficiency
||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||

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Uploaded on: October 27, 2025
Number of pages: 29
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

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