EE8501 PSA Unit 2A MCQ

In load flow studies of a power system, a voltage control bus is specified by

• Real power and reactive power

• Reactive power and voltage magnitude

• Voltage and voltage phase angle

• Real power and voltage magnitude

In power system, the maximum number of buses are

• Generator buses

• Load buses

• Slack buses

• P-V buses

In power system, if a voltage controlled bus is treated as a load bus then which one of the following limits would be violated ?

• Voltage

• Active power

• Reactive power

• Phase angle

In a load flow analysis of a power system, the load connected at a bus is represented as

• Constant current drawn from the bus

• Constant impedance connected at the bus

• Voltage and frequency dependent sources at the bus

• Constant real and reactive power drawn from the bus

The voltage of a particular bus can be controlled by controlling the

• Active power of the bus

• Reactive power of the bus

• Phase angle

• All of the above

Gauss-Seidel interative method can be used for solving a set of

• Linear differential equations only

• Linear algebraic equations only

• Both linear and nonlinear algebraic equations

• Both linear and nonlinear algebraic differential equations

The Gauss-Seidel load flow method has following disadvantages, select the incorrect statement

• Unreliable convergence

• Slow convergence

• Choice of a slack bus affects convergence

• A good initial guess for voltages is essential for convergence

Compared to Gauss-Seidel method, Newton-Raphson method takes

• Less number of iterations and more time per iteration

• Less number of iterations and less time per iteration

• More number of iterations and more time per iteration

• More number of iterations and less time per iteration

Regulation transformers are used in power systems for control of

• Voltage

• Power factor

• Power flow

• All of the above

In a load flow study a PV bus is treated as a PQ bus when

• Voltage limit is violated

• Active power limit is violated

• Phase angle is high

• Reactive power limit is violated