POWER SYSTEMS QUIZ

For a lossy transmission line, the characteristic impedance does not depend on

The operating frequency of the line.

The permittivity of the dielectric separating the conductor.

The conductivity of conductors.

The load terminating the line.

TRUE ANSWER : ?
YOUR ANSWER : ?

The total number of strands in a ACSR conductor are 7, then find the layer number?

2

3

5

7

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Which of the following is/are the effects of corona

interference decreases

charging current increases

All of these

power loss decreases

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A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

-6.92%

6.92%

-10%

10%

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The ground capacitance existing between transmission line and ground is 4µF. Find the inductive reactance of the peterson coil for compensation of arcing grounds?

855.26 Ω

0.844 Ω

265.25 Ω

625.35 Ω

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The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

10.

55.1.

20.

5.

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Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?

Air blast CB.

Oil CB.

SF6 CB.

Vacuum CB.

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Operator "a" rotates a vector

nether 1 nor 2

anti clock wise direction

clock wise direction

either 1 or 2

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In thermal power plants the size of coal after crushing

200 - 205 mm.

300 mm.

40 mm.

20 - 25 mm.

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The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

j6 pu

j3 pu

j9 pu

j1 pu

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