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Power Systems

Power Systems
Units of incremental cost is

 MWhr/Rs
 Rs/MWhr
 RsMW/hr
 Rs/hr

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Power Systems
Bundled conductors in EHV transmission lines

 increase capacitance
 decrease inducatance
 increase inductance
 decrease capacitance

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

All of these
 G-S method
 N-R method
 Decoupled method

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Power Systems
Pump storage schemes are used to improve

 the load factor.
 the power factor.
 the diversity factor.
  the plant capacity factor as well as the load factor of the power system.

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Power Systems
On what factor does the performance of a circuit breaker depend?

  Both A and C.
  None of these.
  Breaking speed.
 Critical length of breaking.

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 3.75 pu
 4.28 pu
 7.25 pu
 2.5 pu

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