Stability of a transmission line can be increased by
Shunt capacitor
Series capacitor
Shunt reactor
Both (a) and (b)
Both (a) and (b)
Power 
Where,
Supply voltage
Receiving end voltage
Reactance
Load angle
For constant power, if 
is more, load angle
will increase and vice versa. Stability of system is more if load angle
decreases. Therefore stability of a transmission line can be increased by both
shunt (capacitor and series capacitor but not shunt reactor.
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