EPRI Practice Exam Questions with 100% Correct Answers

EPRI Practice Exam Questions with 100% Correct Answers A customer 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? (EPRI Chapter 2, number 4) 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 - answerd. Decreases the losses by a factor of four The actual voltage is 362 kV on a 345 kV bus . What is the per unit (p.u.) voltage? (EPRI Chapter 2, number 6) a. 1.0 b. 1.05 c. 1.5 d. 0.95 - answerb. 1.05 A load has a power factor of 0.9 lagging . If the load draws 100 MVA , what is the MW draw? (EPRI Chapter 2 , number 7) a. 100 b. 90 c. 111 d. 44 - answerb. 90 A transmission line is rated at 1000 MVA . The power flow is currently 0 MW and 1001 MVar . Is this transmission line overloaded? (EPRI Chapter 3 , number 4) a. Yes b. No c. Cannot be determined d. The line has no load - answera. Yes The Total Transfer Capability ( TTC ) limit has been determined to be 1000 MW from east to west for a transmission path . The operator sells 500 MW on this path . What is this path's Available Transfer Capability (ATC)? (EPRI Chapter 3 , number 5) a. 1000 MW b. 1500 MW c. 0 MW d. 500 MW - answerd. 500 MW 200 MW is scheduled to flow from Bus " X " to Bus " Y " . Transmission line " A - B " has a 10 % distribution factor for this schedule. How much of the 200 MW schedul will flow on transmission line A-B (EPRI Chapter 3 , number 10) a. 20 MW b. 40 MW c. 180 MW d. 200 MW - answera. 20 MW According to the load / frequency relationship , a 1 % change in frequency will lead to what approximate magnitude of load change in a typical 10,000 MW system ? (EPRI Chapter 4 , numb