# Power System Analysis MCQ Part 2

Power System Analysis MCQ Part 2

## Which of the following is an objective of short circuit calculations

Which of the following is an objective of short circuit calculations:

1. Evaluations of short-circuit withstand ratings of bus bars
2. Calculation of fault voltage dips
3. Protective relaying short-circuit requirement evaluation
4. All of these

Correct answer: 4. All of these

## The higher the X/R ratio PSA MCQ

The higher the X/R ratio, the _________ is the time for which the asymmetry in the total current will be sustained:

1. Shorter
2. Longer

## PSA Part 2 MCQ#3

Statement: In unbalanced three phase system it is quite sufficient to determine the currents and voltages in one phase, and then displace two other two phases:

1. Statement is correct
2. Statement is false
3. Statement may be correct sometimes and false other times

Correct answer: 2. Statement is false

## Which of following is the correct statement about effect grounded systems

Which of following is the correct statement about effect grounded systems:

1. X0/X1 < 1.98, and R0/X0 <7
2. X0/X1 < 8, and R0/X0 <3
3. X0/X1 < 5, and R0/X0 <2
4. X0/X1 < 3, and R0/X0 <1

Correct statement: 4. X0/X1 < 3, and R0/X0 <1

## A graph that can be drawing without crossover of edges is termed as

A graph that can be drawing without crossover of edges is termed as:

1. Planar graph
2. Non-planar graph