BEE Power System 3

Question 1

Which method is commonly used to solve the power flow (load flow) problem in large power systems?

Accepted Answer

Newton-Raphson method

Answer

The Newton-Raphson method converges quadratically and handles large, ill-conditioned systems better than Gauss-Seidel, making it the industry standard for load flow.

Question 2

What is the function of a static VAR compensator (SVC) in a transmission system?

Accepted Answer

To provide dynamic reactive power support and voltage regulation

Answer

An SVC uses thyristor-controlled reactors and capacitor banks to rapidly inject or absorb reactive power, maintaining bus voltage within limits.

Question 3

The equal-area criterion in power system stability analysis is used to assess:

Accepted Answer

Transient (first-swing) stability

Answer

The equal-area criterion determines whether a synchronous generator will remain stable after a sudden disturbance by comparing accelerating and decelerating energy areas on a P-δ curve.

Question 4

Which parameter of a transmission line is primarily responsible for the charging current?

Accepted Answer

Shunt capacitance

Answer

The shunt (line-to-ground) capacitance of a transmission line causes capacitive charging current to flow even when no load is connected.

Question 5

A generator's synchronizing coefficient Ps is positive. What does this indicate?

Accepted Answer

The generator tends to return to synchronism after a small disturbance

Answer

A positive synchronizing coefficient (dP/dδ > 0) means the machine develops a restoring torque when displaced from equilibrium, ensuring steady-state stability.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Power System 3