Virtual Labs

a: Generator inertia and critical rotor angle b: Transmission line impedance and load power c: Generator terminal voltage and excitation level d: Infinite bus voltage and frequency

In the equal area criterion, the 'accelerating area' represents:

a: The energy lost by the generator rotor b: The electrical power output of the generator c: The mechanical power input to the generator d: The energy gained by the generator rotor

A three-phase fault occurs on a transmission line. What happens to the generator rotor angle after the fault?

a: It decreases rapidly b: It remains constant c: It increases due to acceleration d: It oscillates continuously

Which of the following factors improves transient stability in SMIB systems?

a: Increasing fault duration b: Lowering the system voltage c: Using a slower-acting circuit breaker d: Reducing transmission line impedance

In an SMIB system, a fault is cleared by tripping a transmission line. What is the post-fault effect?

a: The system returns immediately to pre-fault conditions b: The generator operates at a lower power transfer level c: The generator loses synchronism with the infinite bus d: The system voltage drops to zero

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