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Power Systems

Welcome to  Power Systems.

The quiz will randomly run 20 questions from Power Systems which you have to answer in 10 minutes.

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Hollow conductors are used in transmission lines to

The rated voltage of a 3-ph power system is given as

A conductor is composed of seven identical copper .Iranu, each having a radius r. The self GMD of the conductors will be

On what basis is the insulation level of a 400 kv, EHV overhead transmission line decided?

A three phase 50 Hz line consists of three conductors each of diameter 21 mm, The spacing between the conductors all follows: A – B = 3m, B – C = 5m, C – A = 3.6m If the line operates at 132 k V, the reactive voltampere generatd by the line per km is

A 3-ph, 4-wire system is commonly used for

A single phaae transmisson line of impedance j 0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is

The main criterion for selection of the size of a distribution for a radial distribution system is

By increasing the transmission voltage double of its original value, the same power can be despatched keeping the line loss

For a standard conductor the ratio of GMR to actual radius is

The main reason for using high voltage for long distance power transmission is

Improving power factor

Feeder is designed mainly from the point of view of

The pu impedance of a line to 50 MVA, 132 kv base is 0.4, the pu impedance to a 100 MVA, 132 kv base will be

In HV transmission, the spacing between sub-conductors of a bundle is approximately

A dc line carries

The voltage across the various discs of a string of suspension insulators having identical discs is different due to

For high-voltage transmission lines, conductors are suspended from towers so as to

Which of the following distribution systems is preferred for good efficiency and high economy

A 100 km long transmission line is loaded at 110 kV.if the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is


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