Transmission and distribution Archives

11. Which of the following characteristics should the line supports for transmission lines possess?

Low cost

High mechanical strength

Longer life

All of the above

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12. Which of the following relays is used on long transmission lines?

Impedance relay

Mho's relay

Reactance relay

None of the above

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on long transmission lines?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-relays-is-used-on-long-transmission-lines/#more-57533">Detailed Solution

13. In transmission lines the cross-arms are made of

Copper

Wood

R.C.C.

Steel

Detailed

Solution

14. Due to which of the following reasons the cables should not be operated too hot?

The oil may loose its viscosity and it may start drawing off from higher levels

Expansion of the oil may cause the sheath to burst

Unequal expansion may create voids in the insulation which will lead to ionization

All of the above

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the cables should not be operated too hot?" class="read-more button" href="https://exam.pscnotes.com/mcq/due-to-which-of-the-following-reasons-the-cables-should-not-be-operated-too-hot/#more-57196">Detailed Solution

15. The loads on distributors systems are generally

Balanced

Unbalanced

Either of the above

None of the above

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16. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as

Kelvin's law

Ohm's law

Kirchhoff's law

Faraday's law

Detailed SolutionIf variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size

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of conductor will be most economical. This statement is known as

17. The distributors for residential areas are

Single phase

Three-phase three wire

Three-phase four wire

None of the above

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18. In a substation the following equipment is not installed

Exciters

Series capacitors

Shunt reactors

Voltaire transformers

Detailed

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Solution

19. Overhead lines generally use

Copper conductors

All aluminium conductors

A.C.S.R. conductors

None of these

Detailed

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Solution

20. Aluminium has a specific gravity of

1.5

2.7

4.2

7.8

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