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Subject - Physics:

Basics

MCQ - 77-10544

Question:

Which of the following statements about high voltage AC transmission are true?

  1. The fractional loss of power due to ohmic heating increases with line voltage.
  2. Electric breakdown occurs at the surface of a conductor when the electric field exceeds the breakdown limit.
  3. An overhead transmission cable consists of twisted strands of high resistance wire.
  4. Electric breakdown occurs at the surface of a conductor when the electric field exceeds the breakdown limit.

Correct Answer: B

Explanation:

Fractional power loss equals ρ(I/A)L/V, where ρ is the resistivity of the cable. There is an upper limit to the current density I/A that can be conducted; otherwise the wire would get too hot. Hence, the fractional loss of power ΔP/P is proportional to L/V. The field strength is highest at the surface of the cable.

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