Q1.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
Q2.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
Q3.A single-phase load is supplied by a single-phase voltage source. If the current flowing from the load to the source is 10<− 150°A and if the voltage at the load terminals is 100<60°V , then the
Answer : Option BExplaination / Solution: No Explaination.
Q4.A source vs(t) = V cos 100πt has an internal impedance of (4 + j3)Ω. If a purely
resistive load connected to this source has to extract the maximum power out of
the source, its value in Ω should be
Answer : Option CExplaination / Solution: No Explaination.
Q5.When the Newton-Raphson method is applied to solve the equation f(x) = x3 + 2x – 1 = 0, the solution at the end of the first iteration with the initial
guess value as x0 = 1.2 is
Answer : Option CExplaination / Solution: No Explaination.
Q6.For a power system network with n nodes, Z33 of its bus impedance matrix is j0.5 per unit. The
voltage at node 3 is 1.3 ∠–10° per unit. If a capacitor having reactance of –j3.5 per unit is now
added to the network between node 3 and the reference node, the current drawn by the capacitor per
unit is
Answer : Option DExplaination / Solution: No Explaination.
Q7.In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles
are very small, and the line resistances are negligible. All the line reactances are equal to j1 Ω.
The voltage phase angles in rad at buses 2 and 3 are
Answer : Option CExplaination / Solution: No Explaination.
Q8.In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 Ω.
If the base impedance and the line-to line base voltage are 100 ohms and 100kV respectively, then the real power in MW delivered by the generator connected at the slack bus is
Answer : Option CExplaination / Solution: No Explaination.
Q10.The horizontally placed conductors of a single phase line operating at 50 Hz
are having outside diameter of 1.6 cm, and the spacing between centers of the
conductors is 6 m. The permittivity of free space is 8.854 × 10-12 F/m. The
capacitance to ground per kilometer of each line is
Answer : Option BExplaination / Solution:
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0