# Power System Analysis MCQ Part 3

Power System Analysis MCQ Part 3

## Short circuit kVA Definition

Short circuit kVA is defined as the product of ________  voltage and __________ current:

1. Normal, Normal
2. Short circuit, Normal
3. Short circuit, Short circuit
4. Normal, Short circuit

Correct answer: 4. Normal, Short circuit

The short circuit kVA is the product of normal system voltage and short circuit current calculated at the point of fault.

## Base impedance in ohms is mathematically expressed as

Base impedance in ohms is mathematically expressed as:

1. [Base voltage in kV (line to line) ] * 1000 / Base kVA
2. [Base voltage in kV (line to line) ]^2 * 1000 / Base kVA
3. [Base voltage in kV (line to line) ]^3 * 1000 / Base kVA
4. None of these

Correct answer: 2. [Base voltage in kV (line to line) ]^2 * 1000 / Base kVA

## Which of the following statements is correct about Per unit system

Which of the following statements is correct about Per unit system:

1. Transformer connections affect the per unit values
2. Referring electrical quantities from one side of the transformer to the other side can be avoided
3. Very often per unit impedances expand to very narrow range
4. None of these

Correct answer: 2. Referring electrical quantities from one side of the transformer to the other side can be avoided

## H in swing equation is defined as

H in swing equation is defined as:

1. KE * S
2. KE/S
3. 2KE + 2S
4. 4KE/S