## EE6501 PSA Important Questions

Anna University Regulation 2013 EEE EE6501 PSA Important Questions with Answer Key for all 5 units and EEE 5th SEM EE6501 Power System Analysis Answer Key is listed down for students to make perfect utilization and score maximum marks with our study materials.

### QUESTION BANK

#### PART: A

1. Define per unit value of an electrical quantity. Write equation for base impedance with respect to 3-phase system.

2. What is bus admittance matrix, bus impedance matrix?

3. What is single line diagram?

4. A generator rated 25MVA, 11KV has a reactance of 15%. Calculate its p.u. reactance for a base of 50MVA and 10KV.

5. What is the need for system analysis in planning and operation of power system?

6. Draw the single phase equivalent circuit of three winding transformer.

7. What are the approximations made in impedance diagram?

8. What are the advantages of per unit system?

9. How is generator in transient analysis represented?

10. Draw the π circuit representation of a transformer with off – nominal ratio ‘α’.

11. Draw a simple per phase model for a cylindrical rotor synchronous machine.

12. What is meant by per phase analysis?

13. What are the functions of power system analysis?

14. What are the applications o Y-bus and Z-bus matrix?

15. What is restructure power system?

16. What is off nominal transformer ratio?

17. Define primitive network ?

18. Give the methods available for forming bus impedance matrix.

20. What are the restructure Models?

#### PART: B

1. The single line diagram of a simple power system is shown in Fig. The rating of the generators and transformers are given below:

Generator 1: 25MVA, 6.6KV, X=0.2p.u

Generator 2: 15MVA, 6.6KV, X=0.15p.u

Generator 3: 30MVA, 13.2KV, X=0.15p.u

Transformer1: 30MVA, 6.9∆/115Υ KV, X=10%

Transformer2: 15MVA, 6.9∆/115Υ KV, X=10%

Transformer3: Single phase units each rated 10MVA, 6.9/69 KV, X=10%

Draw an impedance diagram and mark all values in p.u choosing a base of 30MVA, 6.6KV in the generator 1 circuit.

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EE6501 PSA Important Questions

Anna University 5th SEM EEE PSA Important Questions