Power Systems
Which of the following rotor is used in thermal power plants?

 squirrel cage rotor
 cylindrical rotor
 either of these
 salient pole rotor

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Power Systems
Which of the following statement is/are true?Zn

 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
 both 1 and 2
 nether 1 nor 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit

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Power Systems
Consider a three phase, 50 Hz, 11 kV distribution system. Each of the conductors is suspended by an insulator string having two identical porcelain insulators. The self capacitance of the insulators is 5 times the shunt capacitance between the link and ground. Find the voltage across the two insulators V1 and V2? (V1 = Voltage of disc nearest to the conductor)

 V1 = 5 kV and V2 = 6 kV
 V1 = 6 kV and V2 = 5 kV
 V1 = 2.89 kV and V2 = 3.46 kV
 V1 = 3.46 kV and V2 = 2.89 kV

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