PSA MCQ 24-25

Single line diagram does not represents:

• Ratings of machines
  

• Neutral wire of transmission lines
  

• Delta connection of transformer winding
  

• Star connection of transformer winding

In impedance diagram different power system elements are represented by symbols.

• TRUE

• FALSE

Which of the following is not neglected during formation of reactance diagram from impedance diagram?

• a) Shunt component of Transformers
  

• b) Static loads
  

• c) Resistance of various power system components
  

• d) Reactance of alternators

Gauss Seidal method is also termed as a method of _______

• a) Successive displacement
  

• b) Eliminations
  

• c) False positions
  

• d) Iterations

What is the main difference between Jacobi’s and Gauss-seidal?

• a) Computations in Jacobi’s can be done in parallel but not in Gauss-seidal
  

• b) Convergence in Jacobi’s method is faster
  

• c) Gauss seidal cannot solve the system of linear equations in three variables whereas Jacobi cannot
  

• d) Deviation from the correct answer is more in gauss seidal

What is the limitation of Gauss-seidal method?

• a) It cannot be used for the matrices with non-zero diagonal elements
  

• b) It is more complex than Jacobi’s method
  

• c) It doesn’t guarantees convergence for each and every matrix
  

• d) It is an iterative technique

A 200 bus power system has 160 PQ bus. For achieving a load flow solution by N-R in polar coordinates, the minimum number of simultaneous equation to be solved is ___________

• a) 359
  

• b) 334
  

• c) 357
  

• d) 345

Draw the reactance diagram for generator

What is the main purpose of reactance diagram?

• Load flow analysis
  

• Fault analysis
  

• Calculation of ratings of Alternators
  

• Calculation of ratings of Transformers

Impedance diagram is used for analysis of __________

• a) Load flow
  

• b) Alternator
  

• c) Fault
  

• d) Transmission Line