PSA Past Year university Questions of Unit-4

2018-19

1. Differentiate between stability and instability.
2. On what factor does maximum power transfer depend?
3. What is transient stability? Describe different methods of improving transient stability of a power system.
4. Explain equal area criterion for stability by taking a suitable example of power system.

2017-18

1. Show that the steady state power which could be transmitted over a transmission line will be maximum when R, where X and R have their usual meaning.
2. Explain equal-area criterion for the stability of an alternator supplying infinite busbar via an inductive interconnector.

2016-17

1. Define inertia constant of a synchronous machine and write the unit for inertia constant.
2. Write the power angle equation of a synchronous machine connected to an infinite bus.
3. Explain the inertia constant and swing equations. Explain the terms swing curves in power system stability.
4. Discuss the factors which affect transient state stability of a power system.
5. Write short notes any two of the following: (i) Synchronous machine (ii) Doubling Effect (iii) Transmission lines.