Electrical Engineering MCQs on Power Transmission Part 18

Contents

- 1 If diameter of a conductor is D, and t is radial thickness of ice on it, the volume of ice per meter length of conductor is given mathematically
- 2 Sag of overhead line is affected by
- 3 With an increase in length of transmission lines, the capacitive reactance XC
- 4 If conductor diameter decreases, the inductance of line
- 5 Voltage regulation of transmission line is greatest for which of following power factors

## If diameter of a conductor is D, and t is radial thickness of ice on it, the volume of ice per meter length of conductor is given mathematically

If diameter of a conductor is D, and t is radial thickness of ice on it, the volume of ice per meter length of conductor is given mathematically:

- 𝜋 (D+ t)
^{2} - 𝜋t (D+ t)
^{2} - 𝜋t (D+ t)
- 𝜋t
^{2}(D+ t)

Correct answer: 3. 𝜋t (D+ t)

## Sag of overhead line is affected by

Sag of overhead line is affected by:

- Span and tension
- Wind and temperature
- Conductor weight per unit length
- All of these

Correct answer: 4. All of these

## With an increase in length of transmission lines, the capacitive reactance X_{C}

With an increase in length of transmission lines, the capacitive reactance X_{C}

- Increases
- Decreases
- Remains unchanged
- None of these

Correct answer: 1. Increases

Explanation: With an increases in length of line, the capacitance C increases. Formula for capacitive reactance is: X_{C}=1/2π fC

So, with increase in capacitance, the capacitive reactance will accordingly increase.

## If conductor diameter decreases, the inductance of line

If conductor diameter decreases, the inductance of line:

- Increases
- Decreases
- Remains unchanged
- None of these

Correct answer: 1. Increases

## Voltage regulation of transmission line is greatest for which of following power factors

Voltage regulation of transmission line is greatest for which of following power factors:

- Leading PF
- Lagging PF
- Both of these
- None of these

Correct answer: 2. Lagging PF

Also see:

- Electrical Power Transmission MCQs Part 1
- Electrical Power Transmission MCQs Part 2
- Electrical Power Transmission MCQs Part 3
- Electrical Power Transmission MCQs Part 4
- Electrical Power Transmission MCQs Part 5
- Electrical Power Transmission MCQs Part 6
- Electrical Power Transmission MCQs Part 7
- Electrical Power Transmission MCQs Part 8
- Electrical Power Transmission MCQs Part 9
- Electrical Power Transmission MCQs Part 10