Practice Test NERC Questions with correct answers

A transmission line is operating with a voltage phase angle different of 30 degrees between the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the voltage phase angle difference will be? CORRECT ANSWER The phase angle will increase. When load is increased phase angle will increase. A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw? CORRECT ANSWER 90 pf= mw/mva The high side of a delta-wye connection transformer is connected to a power system with 199 kV L-G high side voltage. What is the voltage across the delta winding of the transformer? CORRECT ANSWER Vl-l= square root of 3 times Vl-g 1.73x191= 345kV If a transmission line is carrying 400 MW and 300 MVAR what is the MVA? CORRECT ANSWER 3-4-5 triangle 500 MVA The prime mover is the component of the generator that creates the rotational force. In a typical coal fired steam generator what component spins the rotor? CORRECT ANSWER Turbine Reactive reserve response during a disturbance is best obtained from which devise? CORRECT ANSWER Synchronous condensers For two identically constructed transmission lines where Line A is 150 miles long and line B is 15 miles long, if both lines are lightly loaded? CORRECT ANSWER A produces more reactive power than B.