2 NOVEMBER 2021 CURRENT AFFAIRS QUIZ

A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

Zs/√(1 + Kcsh)

All of these

√(1 + Kcsh)/Zs

Zs*√(1 + Kcsh)

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In a nuclear reactor, chain reactor is controlled by introducing

brass rods.

cadmium rods.

iron rods.

graphite rods.

TRUE ANSWER : ?
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Which of the following relays are used in protection of medium transmission lines?

any of the above

Admittance relays

Impedance relays

Mho relays

TRUE ANSWER : ?
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Skin effective is more in case of

communication lines

same in both cases

None of these

power lines

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A 60 Hz, 320 Km loss less line has sending end voltage 1.0 pu. The receiving end voltage on no-load is

1.1 pu.

1.116 pu.

none of these.

1.088 pu.

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When a neutral point of 3 - ÃŽÂ¦ system is directly connected to earth then it has what type of grounding?

Resistance.

Reactance.

Solid.

Peterson coil.

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Capacitance voltage transformer ( CVT ) is used to

connect instruments on the LT side.

improve the power factor of the transmission.

reduce losses in a transmission line.

none of these.

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A Pelton wheel turbine having a rated speed of 300 rpm is connected to an alternator to produce power at 50 Hz. The number of poles required in the alternator is

8

20

4

10

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A sodium graphite reactors use

a mixture of sodium and graphite as moderator.

sodium as coolant and graphite as moderator.

sodium as moderator and graphite as coolant.

a mixture of sodium and graphite as coolant.

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Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

X" < X' < X

X" < X' > X

X" > X' < X

X" > X' >X

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