The rms value of v(t)=Vmax cos(wt) is given by

In the following power system, if  prefault voltage at Bus 2 is 1 pu, and subtransient reactance of generators are 0.15 pu, what is the approximate magnitude of a 3-phase bolted fault current at Bus 2? Neglect resistors and loads. PS(2).png

In the following power system, what is the imaginary part of Y22? PS(2).png

What is the main advantage of using per unit system?

In the following power system, power flow solution will determine how many main unknowns? PS(2).png

A transmission line has the following parameters: z=0.02+j0.33 S/km y=j4.7×10-6 S/km Length=300 If sending and receiving end voltages are 500kV, what is its maximum theoretical real power transmission capability? 

In the following power system, if V2∠δ2= 0.9717∠-2.7o , what is the real power loss on Line 12? (Sb=100MVA) PS(2).png

In 1957, Republican President Dwight D. Eisenhower federalized local National Guard troops to enforce the desegregation of: A) Little Rock High School B) Louisiana State University C) University of Alabama D) Mississippi State 

True or False. Prior to his election as Vice-President in 1960, Senator Lyndon Baines Johnson of Texas had usually supported segregation laws in the South.   A) True B) False 

In the 1940s, the new federal agency called the _?_, conducted investigations into racial discrimination against African-Americans who applied to work for federal government contractors. A) the FEPCB) the NAACPC) the SCLC  D) the HBCU