Newton Raphson (NR) method - Electrical Engineering (MCQ) questions and answers

1)   Initially what will be the voltage at all the PQ buses for solving the load flow problem using NR method?

a. Vi = 1 ∠ 90°
b. Vi = 1 ∠ 0°
c. Vi = 1 ∠ 180°
d. Vi = 1 ∠ 45°
Answer  Explanation 

ANSWER: Vi = 1 ∠ 0°

Explanation:
No explanation is available for this question!
2)   What is the size of the sub matrix “H “of the jacobian, if n1 is the number of PV buses and n2 the number of PQ buses?

a. (n1 + n2)2
b. n1 * n2
c. (n1 + n2) n1
d. (n1 + n2) n2
Answer  Explanation 

ANSWER: (n1 + n2)2

Explanation:
No explanation is available for this question!
3)   Which among the following matrix is sparse?

a. Jacobian matrix only
b. Y bus matrix only
c. Z bus matrix only
d. Both (a) and (b)
e. All of these
Answer  Explanation 

ANSWER: Both (a) and (b)

Explanation:
No explanation is available for this question!
4)   What is the main drawback in NR method?

a. Slow to converge
b. A large memory allocation is required to store the jacobian matrix
c. The number of iterations is more
d. All of these
e. None of these
Answer  Explanation 

ANSWER: A large memory allocation is required to store the jacobian matrix

Explanation:
No explanation is available for this question!
5)   Which types of equations are solved using Newton Raphson method?

a. Non linear differential equations
b. Linear differential equations
c. Non linear algebraic equations
d. Both (a) and (b)
e. All of these
Answer  Explanation 

ANSWER: Non linear algebraic equations

Explanation:
No explanation is available for this question!

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