Electric Power Research Institute EPRI Practice test (103 Questions with 100% Correct Answers)
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Course
Electric Power Research Institute EPRI
Institution
Electric Power Research Institute EPRI
If a generator is producing 500 MW and 200 Mvar, is the generator?
A. Leading
B. Lagging
C. Underexcited
D. Dropping - B. Lagging
What is the IEEE device number for a differential relay?
A. 87
B. 86
C. 67
D. 50 - A. 87
Can a synchronous machine have a negative torque angle? What does
thi...
Electric Power Research Institute EPRI Practice test If a generator is producing 500 MW and 200 Mvar, is the generator? A. Leading B. Lagging C. Underexcited D. Dropping - ✔✔B. Lagging What is the IEEE device number for a differential relay? A. 87 B. 86 C. 67 D. 50 - ✔✔A. 87 Can a synchron ous 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 - ✔✔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 - ✔✔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 - ✔✔A. 50 amps / 5000 watts The actual voltage is 362 kV on a 345 kV bus. W hat is the p.u. voltage? A. 1.0 B. 1.05 C. 1.5 D. .95 - ✔✔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 - ✔✔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 - ✔✔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. inte rmediate pressure turbine C. low pressure turbine D. crossover - ✔✔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 - ✔✔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 D. All of the above - ✔✔B. The t hermal capability of system equipment Reactive power flow is influenced more by system power and torque angles than reactive power. A. True B. False - ✔✔B. False
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