GATE EE 2017 Question Paper (11-Feb-2017) (Shift 1)

A 10-bus power system consists of four generator buses indexed as G1, G2, G3, G4 and six load buses indexed as L1, L2, L3, L4, L5, L6. The generator-bus G1 is considered as slack bus, and the load buses L3 and L4 are voltage-controlled buses. The generator at bus G2 cannot supply the required reactive power demand, and hence it is operating at its maximum reactive power limit. The number of non-linear equations required for solving the load flow problem using Newton-Raphson method in polar form is ___________.

Consider the unity feedback control system shown. The value of K that results in a phase margin of the system to be 30° is __________. (Give the answer up to two decimal places.)

The following measurements are obtained on a single-phase load: V = 220 V ± 1%, I = 5.0 A ± 1% and W = 55 W ± 2%. If the power factor is calculated using these measurements, the worst-case error in the calculated power factor in percent is _________. (Give answer up to once decimal)

In the Inverter circuit shown below, the switches are controlled such that the load voltage v₀(t) is a 400 Hz square wave.



The RMS value of the fundamental component of v₀(t) in volts is _________.

A 3-phase voltage source inverter is supplied from a 600 V DC source as shown in the figure below. For a star connected resistive load of 20 Ω per phase, the load power for 120° device conduction, in kW, is ____________.