# Power System Analysis MCQ Part 6

Power System Analysis MCQ Part 6

More PSA MCQ

## The number of nodes and the number of branches in a tree are related by

The number of nodes and the number of branches in a tree are related by:

1. b = n
2. b = n+1
3. b = n-1
4. b = 2n

Correct answer: 3. b = n-1

## What is the value of (1+ a + a^2)

What is the value of (1+ a + a2):

1. 1
2. 0
3. Infinity

## In star-delta or delta-star transformers the positive sequence line voltage on one side leads the corresponding line voltage on the other side by an angel of

In star-delta or delta-star transformers the positive sequence line voltage on one side leads the corresponding line voltage on the other side by an angel of:

1. 30°
2. 60°
3. 90°

## What are some assumptions made for the equal area criterion

What are some assumptions made for the equal area criterion:

1. Mechanical input remains constant
2. The transmission line and machine resistances are neglected
3. Rotor speed of the machine is considered constant
4. All of these

Correct answer: 4. All of these

## The dimension of bus incidence matrix is

The dimension of bus incidence matrix is:

1. exn
2. ex(n-1)
3. ex(n+1)
4. ex(n+2)