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Power Systems

Power Systems
Ferranti effect occurs under

 full load
 half load
 any of the above
 no load

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Power Systems
Find the value of a729, where "a" is the operator

 0
 α²
 α
 1

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.5 pu, Zm =0.6 pu

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

 1.35.
  0.99.
 0.75.
 1.0.

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

 Initial cost of synchronous phase modifier is higher
 It requires more maintenance because of running equipment
 It consumes both active and reactive power
All of these

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Power Systems
The maximum demand of a consumer is 2 kW and corresponding daily energy consumption is 30 units. What is the corresponding load factor?

 62.5%
 25%
 50.5%
 75%

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