GATE EE 2011 Question Paper (13-Feb-2011) (Shift 2)

Roots of the algebraic equation x³ + x² + x + 1 = 0 are

Two generator units G₁ and G₂ are connected by 15kV line with a bus at the mid-point as shown below



G₁ = 250 MVA, 15 kV, positive sequence reactance X${}_{G1}$ = 25% on its own base

G₂ = 100 MVA, 15 kV, positive sequence reactance X${}_{G2}$ = 10% on its own base L₁ and L₂ = 10 km, positive sequence reactance X${}_L$ = 0.225 Ω/km

For the above system, the positive sequence diagram with the p.u values on the 100 MVA common base

Two generator units G₁ and G₂ are connected by 15kV line with a bus at the mid-point as shown below



G₁ = 250 MVA, 15 kV, positive sequence reactance X${}_{G1}$ = 25% on its own base

G₂ = 100 MVA, 15 kV, positive sequence reactance X${}_{G2}$ = 10% on its own base L₁ and L₂ = 10 km, positive sequence reactance X${}_L$ = 0.225 Ω/km

In the above system, the three – phase fault MVA at the bus 3 is

A solar energy installation rectifier a three phase bridge converter to load energy into power system through a transformer of 400V/ 400V, as shown below.



The energy is collected on a bank of 400V battery and is connected to converter through a large filter choke of resistance 10Ω.The maximum current through the battery will be

A solar energy installation rectifier a three phase bridge converter to load energy into power system through a transformer of 400V/ 400V, as shown below.



The energy is collected on a bank of 400V battery and is connected to converter through a large filter choke of resistance 10Ω.The KVA rating of the output transformer is