Electrical Power Transmission MCQs Part 18

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Electrical Engineering MCQs on Power Transmission Part 18

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:

  1. 𝜋 (D+ t)2
  2. 𝜋t (D+ t)2
  3. 𝜋t (D+ t)
  4. 𝜋t2(D+ t)

Correct answer: 3. 𝜋t (D+ t)

Sag of overhead line is affected by

Sag of overhead line is affected by:

  1. Span and tension
  2. Wind and temperature
  3. Conductor weight per unit length
  4. All of these

Correct answer: 4. All of these

With an increase in length of transmission lines, the capacitive reactance XC

With an increase in length of transmission lines, the capacitive reactance XC

  1. Increases
  2. Decreases
  3. Remains unchanged
  4. None of these

Correct answer: 1. Increases

Explanation: With an increases in length of line, the capacitance C increases. Formula for capacitive reactance is: XC=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:

  1. Increases
  2. Decreases
  3. Remains unchanged
  4. 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:

  1. Leading PF
  2. Lagging PF
  3. Both of these
  4. None of these

Correct answer: 2. Lagging PF

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