POWER SYSTEMS QUIZ

Lightning arresters are made up of which material?

copper

silver

any of the above

silicon oxide

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If in a line, resistance and reactance are found to be equal and regulation is zero, then load will have

0.707 leading power factor

0.707 lagging power factor

zero power factor

unity power factor

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Which of the following power stations is mainly used to cover peak load on the system?

pumped storage hydro power plant

coal based thermal power plant

nuclear plant

gas based thermal power plant

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A fuse wire of circular cross-section has a radius of 0.8 mm. The wire blows off at an current of 8 Amp. Calculate the radius of wire that will blow off at an current of 1 amp?

2 mm.

0.2 mm.

0.4 mm.

4 mm.

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Nuclear fission means

graphite.

moderator.

combination of two light nuclei.

breaking up of nuclear of heavy atoms into nearly equal parts.

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What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

150 : 4 / √3.

200 : 5 / √3.

120 : 6 / √3.

100 : 5 / √3.

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For accurate load flow calculations on large power systems, the best method is

G-S method

All of these

Decoupled method

N-R method

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In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

500 ohms

5 ohms

50 ohms

0.5 ohm

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What type of back up protection is used for alternators?

IDMT relay.

Buchholz relay.

Impedance relay.

Mho relay.

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Specified quantities of load bus are

P and Q

V and δ

P and δ

Q and V

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