Question 1
Consider the behavior of a synchronous machine to some impacts due to disturbances.
At the time of occurrence of a fault, the machine will start to accelerate. When the fault is cleared, it will continue to increase speed before it reaches to its peak value (δc).
When deceleration area is greater than the acceleration area, the system will decelerate entirely before getting accelerated again. Due to the fact that the rotor inertia will force the successive acceleration and deceleration areas to become smaller than the initial values. Causing the system to reach steady state.
Question 2
With increase in self inductance per phase will be reduced compared to single conductor line. This results in lesser reactance per phase compared to ordinary single line. Hence lesser loss due to reactance drop.
Bundled conductors per phase reduces the voltage gradient in the vicinity of the line. Thus reduces the possibility of the corona discharge.
Bundled conductors reduces radio interference due to the dact that magnetic field around it is not intense as solid conductors.
Answer is (2)
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