POWER SYSTEMS QUIZ

A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

75%

66.66%

33.33%

25%

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following statement is/are true regarding infinite line?

It maintains the constant voltage

It has infinite voltage

both 2 and 3

It has infinite length

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YOUR ANSWER : ?

The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

0.93

1.13

1

0.882

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Deflectors are provided in

Pelton wheel.

propeller turbine.

Kaplan turbine.

Francis turbine.

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The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

A resistance of 100 ohm.

A resistance of 100/3 ohm.

A resistance of j300 ohm.

A resistance of j100/3 ohm.

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YOUR ANSWER : ?

A CT is connected in ___________________ with the line.

not connected.

series.

across.

both A and B.

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Which of the following is/are the disadvantages of phase modifiers?

Initial cost of synchronous phase modifier is higher

It consumes both active and reactive power

All of these

It requires more maintenance because of running equipment

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A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is

32 m/s

159.24 m/s

159.24 m/µs

0.0312 m/s

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YOUR ANSWER : ?

The specific speed of water turbine is the speed at which the turbine develops

maximum horse power.

unit horse power at all heads.

a minimum horse power.

unit horse power at unit head.

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Objectives of power system is/are

nether 1 nor 2

Rated voltage and frequency has to be supplied to the consumers

both 1 and 2

Cost of electrical energy per KWh is to be minimum

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