RVUNL EE POWER SYSTEM QUIZ 3

The equation of area control error (ACE) is _________

Where, 

ΔP_tie = Power change in tie line

Δf = change in frequency

b = bias constant

Which of the following is/are correct about equal area criteria?

1. It is applicable to single machine infinite bus system.

2. It is applicable to multi-machine system.

3. The actions of governor and voltage regulator are considered.

4. The actions of governor and voltage regulator are not considered.

Which of the below given methods are useful for transient stability improvement ?

1. Reduction in accelerating torque by applying artificial load.

2. Using high speed circuit breakers.

3. By reducing transfer reactance.

4. Increases efficiency but not output

The identical synchronous machines A and B running at the same speed, linked through an inductor is shown in the figure below:

Machine A will supply active and reactive power to machine B, when is

For a single machine infinite BUS system, if P_e = 2sinδ p.u. at δ = 30°, synchronizing power coefficient is ________.

If the stiffness coefficient of a synchronous machine is positive, then the system is: