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Power Systems

Power Systems
Phase shift occurs due to which of the following components?

 conductance
 both 1 and 2
 inductance
 capacitance

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Power Systems
For symmetrical network, the neutral current is

 infinity
 maximum
 zero
 any of the above

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Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Y-Δ connection
 Δ-Y connection
 Y-Y connection
 Δ-Δ connection

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Power Systems
If the rated receiving end voltage is 33 kV, then what are the limits for safe operation of equipments?

 any voltage above 33 kV
 31.35 to 34.65 kV
 25 to 35 kV
 33 to 50 kV

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Power Systems
String efficiency depends upon

 voltage rating of one SCR.
  all of these.
 voltage rating of whole string.
 no. of SCR in the string.

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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (MVA)b*100/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)
 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b/(KV)²b

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