Transmission and distribution Archives

21. Multi-core cables generally use

Square conductors

Circular conductors

Rectangular conductors

None of the above

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22. Corona usually occurs when the electrostatic stress in air around the conductor exceeds

6.6 kV (r.m.s. value)/cm

11 kV (r.m.s. value)/cm

22 kV (maximum value)/cm

30 kV (maximum value)/cm

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23. Galvanized steel wire is generally used as

Stay wire

Earth wire

Structural components

All of the above

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24. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?

Current will flow to earth

Supply voltage will drop

Supply voltage will increase

No current will flow in the conductor

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25. By which of the following methods string efficiency can be improved?

Using a guard ring

Grading the insulator

Using long cross arm

Any of the above

Detailed

Solution

26. The voltage regulation in magnetic amplifier type voltage regulator is effected by

Electromagnetic induction

Varying the resistance

Varying the reactance

Variable transformer

Detailed SolutionThe voltage

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regulation in magnetic amplifier type voltage regulator is effected by

27. Which of the following is the demerit of a ‘constant voltage transmission system’ ?

Increase of short-circuit current of the system

Availability of steady voltage at all loads at the line terminals

Possibility of better protection for the line due to possible use of higher terminal reactants

Improvement of power factor at times of moderate and heavy loads E. Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Detailed SolutionWhich of the following is the demerit of a ‘constant voltage transmission system’ ?