EE MCQ

SSC JE Electrical 2019 with solution SET-2
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While estimating the overhead lines, if the number of poles required is 14, then what is the estimated number of earth sets required?

While estimating the overhead lines, the first and last pole is always earth connected and after every 3rd electrical pole, the fourth pole is earthed. Therefore, the approximate number of required ground set = 4

Related Question

SSC JE Electrical 2019 with solution SET-2
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Voltage regulation is considered to be the best for transmission lines?

Voltage Regulation: When the transmission line is energized, the current is flowing in the line. Due to this current, a voltage drop occurs because of the resistance and inductance of the line. So, the receiving-end voltage (VR) is always less than the sending-end voltage (Vs).

The difference produced in the voltage at the receiving end of the transmission line from no load to full load conditions is known as voltage regulation of the line and it is expressed as a percentage of the receiving-end voltage (VR).

It is always desirable that the voltage regulation of the line should be low, or in other words, the increase in the load current should lead to a small difference in the receiving-end voltage.

SSC JE Electrical 2019 with solution SET-2
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Permeance is analogous to an electrical circuit?

The permeance of the magnetic circuit is defined as the reciprocal of the reluctance.

Permeance = 1/Reluctance

It is defined as the property of the magnetic circuit due to which it allows the flow of the magnetic flux through it. Permeance is analogous to conductance in an electric circuit.

SSC JE Electrical 2019 with solution SET-2
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A series magnetic circuit will have

In the same way that we can have series, parallel or series-parallel electric circuits, we can also have equivalent series and series-parallel (but not parallel) magnetic circuits.

In practice, a magnetic circuit may consist of several parts in a series of different lengths, cross-sectional areas, and permeabilities. In such a series magnetic circuits, all the reluctances of several parts will get summed up together (as resistors in an electric circuit) to form the net reluctance of the circuit.

In series magnetic circuits the flux passing through each part will be the same (as current in the series electric circuits).