Transmission Lines - Effect of Copper's weight & Line Efficiency

Transmission Lines - Effect of Copper's weight & Line Efficiency

Q1. In transmission system, the weight of copper used is proportional to

a. Square of voltage
b. Voltage.
c. 1/ (square of voltage)
d. 1/ voltage

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Q2. Greater the power factor the ________________ is the volume of copper required.

a. Greater
b. Smaller
c. Both are equal.
d. Depending of the level of transmission.

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Q3. Line efficiency increases for ___________________ transmission voltages.

a. Higher.
b. Lower.
c. Both (a) and (b)
d. None of these.

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Q4. The most important disadvantage of using the high voltage for transmission is

a. The increased cost of insulating the conductors.
b. The increased cost of transformers, switchgear and the other terminal apparatus.
c. Both (a) and (b).
d. There is a reduction in the corona loss.

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Q5. The most suitable practical value of primary distribution is?

a. 66 kV
b. 6.6 kV
c. 230 V/ 400 V
d. 22 kV

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Q6. What is the main drawback of overhead system over underground system?

a. Surge problem
b. High initial cost.
c. Higher charging current.
d. Underground system is more flexible than overhead system.

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Q7. For the same conductor length, same amount of power, same losses and maximum voltage to earth, which system requires minimum conductor area?

a. 3 wire ac
b. 2 wire ac.
c. 2 wire dc.
d. Single phase.

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