Electrical Power Transmission MCQs Part 27

Electrical Engineering MCQs on Power Transmission Part 27

As per BS 7671 the minimum resistance required during insulation test for 500 V DC voltage is

As per BS 7671 the minimum resistance required during insulation test for 500 V DC voltage is

1. 0.25 MΩ 
2. 0.5 MΩ 
3. 1 MΩ 
4. 2 MΩ 
5. 100 MΩ

Correct answer: 3. 1 MΩ

See explanation here

Capacitance of transmission line

Capacitance of transmission line:

1. Affects power factor
2. Affects transmission efficiency
3. Causes charging current
4. All of these

Correct answer: 4. All of these

A stranded conductor has

A stranded conductor has:

1. Less corona effect than solid conductor
2. More corona effect than solid conductor
3. Same corona effect as the solid conductor has
4. None of these

Correct answer: 2. More corona effect than solid conductor

In string of suspension insulators, charging current is maximum through the disc

In string of suspension insulators, charging current is maximum through the disc:

1. Nearest to the conductor
2. Nearest to the cross arm
3. In middle of string
4. None of these

Correct answer: 1. Nearest to the conductor

Also see:

Also see: Top 5 Types of Insulators Used on Power Transmission and Distribution Lines

The correct formula between line voltage and voltage across string for a string of suspension insulators is

The correct formula between line voltage and voltage across string for a string of suspension insulators is:

1. 3
2. 1/√3
3. √3
4. 1/3

Correct answer:  3. √3