UP polytechnic Lecturer (EE) Quiz 21

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.

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

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 zero-sequence current of a generator for line to ground fault is j4 pu. Then the current through the neutral during the fault is

The equation of area control error (ACE) is _________

Where, 

ΔP_tie = Power change in tie line

Δf = change in frequency

b = bias constant

A 11 KV system having line to ground capacitance is 2 μF and inductance is 5 H. Find out the voltage appearing across the contact of circuit breaker. If an instantaneous magnetizing current of 5 A is interrupted?

Series reactors are used to