# Electrical Power Transmission MCQs Part 22

Electrical Power Transmission MCQs Part 22

## The favorable economic factor involved in power transmission at high voltage is

The favorable economic factor involved in power transmission at high voltage is:

1. Smaller size of generation plant
2. Decreased insulation required for line conductors
3. Reduction of conduction cross-section area
4. Increased I²R losses

Correct answer: 3. Reduction of conduction cross-section area

## EHV cables are filled with thin oil under pressure in order to

EHV cables are filled with thin oil under pressure in order to:

1. Prevent entry of moisture
2. Prevent formation of voids
3. To provide insulation
4. To strengthen cable conductor

Correct answer: 2. Prevent formation of voids

## Range of accelerating factor is

Range of accelerating factor is

1. 1 to 1.5
2. 1.6 to 1.8
3. 10.8 to 11.98
4. 50 to 100

Correct answer: 2. 1.6 to 1.8

Explanation: Accelerating factor is used for reducing number of iterations using Gauss-Siedel method. The range of accelerating factor is between 1.6 to 1.8.

## The total diameter of a 3 layer ACSR conductor whose each strand has diameter d, then find the total diameter of ACSR conductor

The total diameter of a 3 layer ACSR conductor whose each strand has diameter d, then find the total diameter of ACSR conductor

1. d
2. 2d
3. 3d
4. 5d

Explanation:

Total diameter of ACSR conductor D = (2X – 1) X d

Where,

X = layer number

d = diameter of each strand

Therefore,

Total diameter of ACSR conductor D = (2 X 3 – 1) X d = 5d

## The internal inductance of an ACSR conductor is 0.05 mH/Km for µr = 1. If the ACSR is replaced with another having µr = 2, then find the internal inductance

The internal inductance of an ACSR conductor is 0.05 mH/Km for µr = 1. If the ACSR is replaced with another having µr = 2, then find the internal inductance:

1. 0.1 mH/Km
2. 0.3 mH/Km
3. 0.5 mH/Km
4. 0.7 mH/Km