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Power Systems

Power Systems
The insulator thickness on the conductor, in cables depends upon

 power factor
 current
 voltage
 reactive power

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Power Systems
Which of the following insulator is practically used for railway crossings?

All of these
 string insulator
 strain insulator
 pin insulator

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Power Systems
Condition for zero voltage regulation is

 cosφ = X/R
 cosφ = R/X
 tanφ = X/R
 tanφ = R/X

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Power Systems
Fault calculations using computer are usually done by

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

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 2.4 pu
 3.975 pu
 1.375 pu
 0.2 pu

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Power Systems
The only place where slip ring induction motors used in thermal power plants is

  lubrication oil pumps.
  conveyors.
  coal handling plant.
  none of above.

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