Electrical Power Transmission MCQs Part 14

Contents

## Suspension type insulators are employed for voltages beyond

Suspension type insulators are employed for voltages beyond:

- 230 V
- 11 kV
- 13 kV
- 33 kV

Correct answer: 4. 33 kV

## If span is increased, the sag

If span is increased, the sag:

- Increases
- Decreases
- Is not being affected
- None of above

Correct answer: 1. Increases

## If string efficiency is increased, voltage across disc nearest to conductor

If string efficiency is increased, voltage across disc nearest to conductor:

- Increases
- Decreases
- Remains unchanged
- None of these

Correct answer: 2. Decreases

## A string efficiency of 100% implies that

A string efficiency of 100% implies that:

- Shunt capacitance is maximum
- Shunt capacitance is zero
- Self-capacitance is maximum
- Self-capacitance is zero

Correct answer: 2. Shunt capacitance is zero Explanation: If shunt capacitance is zero, this indicates that charging current through each disc will be the same. This means that voltage across each disc is the same. This inturn implies 100% string efficiency.

## With an increase in length of transmission lines, the resistance of line

With an increase in length of transmission lines, the resistance of line:

- Increases
- Decreases
- Remains unchanged
- None of these

Correct answer: 1. Increases

Explanation: Resistance of line is mathematically expressed in the form:

R= ρl/a

Since length of transmission and resistance are directly proportional, the resistance R increases.

See Complete list of Electrical Power transmission MCQs here