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Power Systems

Power Systems
Fault calculations using computer are usually done by

 Z bus method
 either 1 or 2
 Y bus method
None of these

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Power Systems
Earthing switch is used for

All of these
 protection of equipment from ground faults
 discharging residual energies
 measuring of safety voltage

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Power Systems
For which one of the following types of motors, is the equal area criterion for stability applicable?

 DC series motor
 DC shunt motor
 Three phase synchronous motor
 Three phase induction motor

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Power Systems
Pipes carrying steam are generally of

  steel.
 aluminium.
 cobalt.
 cast iron.

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Power Systems
Advantages of pumped storage plants is/are

 most economical as a peak load supply plant
 operating time is minimum
 used as load frequency control
All of these

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠°90 Ω, C = 0.5*10^-6∠90° â„§. Find Charging current under no load?

 1.144∠90° A/phase
 0.512∠90° A/phase
 0.144∠90° A/phase
 0.344∠90° A/phase

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