GATE EE 2022: Power Systems Quiz 24 (App update required to attempt this test)

An alternator of E = 1.2 pu and Xg = 0.5 pu is connected to an infinite bus (V = I_pu). Power delivered by the alternator to the infinite bus is 1.0 pu. Now the steam input to the alternator is suddenly raised to 1.5 pu and remains stable. Torque angle change is _______degree.

For 50 MW generator if generator loading is Pi and its cost function is

225 + 53 Pi + 0.02 Pi²

The incremental fuel cost in Rs/MWhr considering 100% loading is

A generator has the sequence reactance as X₁ = 60%, X₂ = 25% and X₀ = 15%. The value of resistance to be connected to neutral such that the current for single line to ground fault does not exceed the rated current (take E_a = 1 p.u.)

For a power system consider following parameters as:

Total Buses = 300

Generator Buses = 20

Reactive power support buses = 25

Fixed shunt capacitor buses = 15

For newton-Rapson method is used, then choose the correct option(s):

A 3D system is supplying a delta connected load with a line current of 15A. If line of phase ‘C’ gets open circuited, then the negative sequence component of line current in phase ‘C’ is (Take current in line ‘a’ as reference).

If the corona loss in a power transmission at 35 Hz is 1200 W, then what will be the corona loss at 25 Hz.