Power System MCQs Part 6

Contents

## The reactance relay is

The reactance relay is

- Voltage restrained directional relay
- Voltage restrained over-current relay
- Directional restrained over-current relay
- None of the above

Correct answer: 3. Directional restrained over-current relay

## I and T are the line current and the torque respectively when DOL starter is used, these quantities when Y/Δ starter is used, are

I and T are the line current and the torque respectively when DOL starter is used, these quantities when Y/Δ starter is used, are:

- 1/√3, T/ 3
- 1/3, T/ √3
- 1/√2, T/ √2
- 1/2, T/4

Correct answer: 1. 1/√3, T/ 3

## Bonding the cable will result so as

Bonding the cable will result so as

- To increase the effective resistance and inductance
- To decrease the effective resistance and inductance
- To decrease the effective resistance but increase the inductance
- To increase the effective resistance but reduce inductance

Correct answer: 4. To increase the effective resistance but reduce inductance

## The presence of earth in case of overhead lines

The presence of earth in case of overhead lines

- Decreases the capacitance
- Decreases the inductance
- Increases the capacitance
- Increases the inductance

Correct answer: 3. Increases the capacitance

## In order to have lower cost of generation of electricity

In order to have lower cost of generation of electricity

- The load factor and diversity factor should be low
- The load factor and diversity factors should be high
- The load factor should be low but diversity factor should be high
- The load factor should be high but diversity factor low

Correct answer: 2. The load factor and diversity factors should be high