Power Systems Analysis

The load flow solution is always assured in case of:

• Newton-Raphson method

• Gauss method

• Gauss-Seidel method

• None of these methods guarantees

The disadvantage of large memory requirement can be overcome by decoupling the coupling between

• p-δ and Q-V

• p-δ or Q-V

• P-V and Q-δ

• None of these methods guarantees

Which among the following quantities are specified at the generator bus?

• P and Q

• P and |V|

• Q and |V|

• P and δ

Which among the following quantities are specified at the load bus?

• P and Q

• P and |V|

• Q and |V|

• P and δ

Why are load flow studies carried out?

• To study of stability of the system

• For fault calculations

• For planning the power system

• All of these

The G-S load flow method has following disadvantages

• Unreliable convergence

• Slow convergence

• Choice of slack bus affects convergence

• A good initial guess for voltages is essential for convergence

If a PV bus is treated as a load bus then which one of the following limits would violated

• Voltage

• Active power

• Reactive power

• Phase angle

GAUSS SEIDEL method can be used for solving the set of

• Linear algebraic equations

• Non Linear algebraic equations

• Arithmatic equations

• None of above these methods

Zero sequence current can flow from a line in to transformer bank if the winding's are in

• Grounded star/delta

• Delta/star

• Star/grounded star

• Delta/delta

What is the value of zero sequence impedance in line to line faults?

• Z0 = 1

• Z0 = ∞

• Z0 = 3 Zn

• Z0 = 0