If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

The purpose of skewing of rotor slots in an induction motor is

For reduction of harmonics method is given below:
Chording
integral slot winding
skewing
larger air gap
Sr≠Ss : avoid cogging
Sr-Ss≠P,2P,5P avoid synchronous cusps
Sr -Ss ≠ 3P avoid magnetic locking
here, Sr is number of rotor slot, Ss is number of stator slot

The corona effect can be minimized by increasing

Corona can be reduced by using large size of conductor, bundle conductor and hollow conductor.

Which of the following power distribution system gives better reliabity ?

The main advantage of using fractional pitch winding is to refuce

due to fractional pitch EMF can be approximately made into sine wave
losses due to harmonics reduced
saving in conductor material
mechanical strength of coil is increased.

The circuit breaker generally used in railway traction is