Q3.The sequence components of the fault current are as follows: Ipositive = j1.5 pu, Inegative = –j0.5 pu, Izero = –j1 pu. The type of fault in the system is
Q6.In the following figure, C1 and C2 are ideal capacitors. C1 has been charged to 12 V before the ideal
switch S is closed at t = 0. The current i(t) for all t is
Answer : Option DExplaination / Solution:
Time constant = RC
In the given circuit, R = 0
Rise time = 0; hence capacitor charges instantaneously and the current can be represented as impulse function
Q7.A cylindrical rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a
transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite bus
voltage is 1 pu. The inertia constant of the generator is 5 MW-s/MVA and the generator reactance
is 1 pu. The critical clearing angle, in degrees, for a three-phase dead short circuit fault at the
generator terminal is