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## Marks 1

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The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator a...
GATE EE 2018
The series impedance matrix of a short three-phase transmission line in phase coordinates is $$\left[ {\matrix{ {{Z_s... GATE EE 2018 A 2-bus system and corresponding zero sequence network are shown in the figure. The transformers T1 and T2 are connec... GATE EE 2014 Set 1 For a fully transposed transmission line GATE EE 2014 Set 3 A three phase star-connected load is drawing power at a voltage of 0.9 pu and 0.8 power factor lagging. The three phase ... GATE EE 2014 Set 2 Three phase to ground fault takes place at locations$${F_1}$$and$${F_2}$$in the system shown in the figure. If the... GATE EE 2014 Set 1 The sequence components of the fault current are as follows:$${{\rm I}_{positive}} = j1.5\,pu,\,\,{{\rm I}_{negative}}...
GATE EE 2012
A 3-phase transmission line is shown in figure: Voltage drop across the transmission line is given by the following eq...
GATE EE 2008
For a fault at the terminals of a synchronous generator, the fault current is maximum for a
GATE EE 1997
For an unbalanced fault, with paths for zero sequence currents, at the point of fault
GATE EE 1996
The positive sequence component of the voltage at the point of fault in a power system is zero for a _________fault.
GATE EE 1995

## Marks 2

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The positive, negative and zero sequence impedances of a three phase generator are Z1, Z2 and Z0 respectively. For a lin...
GATE EE 2018
The positive, negative and zero sequence reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1...
GATE EE 2017 Set 1
A 30 MVA, 3-phase, 50Hz, 13.8 kV, star-connected synchronous generator has positive, negative and zero sequence reactanc...
GATE EE 2016 Set 1
A sustained three phase fault occurs in the power system shown in the figure. The current and voltage phasors during the...
GATE EE 2015 Set 1
A three phase, $$100$$ $$MVA,$$ $$25$$ $$kV$$ generator has solidly grounded neutral. The positive, negative, and the ze...
GATE EE 2014 Set 2
In an unbalanced three phase system phase current $${{\rm I}_a} = 1\angle \left( { - {{90}^0}} \right)\,\,pu,\,\,$$ nega...
GATE EE 2014 Set 1
The zero-sequence circuit of the three phase transformer shown in the figure is ...
GATE EE 2010
Given that: $$\,{V_{s1}} = {V_{s2}} = 1 + j0\,\,p.u,\,\, + ve\,\,$$ sequence impedance are $$\,{Z_{s1}} = {Z_{s2}} = 0.... GATE EE 2008 Given that:$$\,{V_{s1}} = {V_{s2}} = 1 + j0\,\,p.u,\,\, + ve\,\,$$sequence impedance are$$\,{Z_{s1}} = {Z_{s2}} = 0....
GATE EE 2008
Given that: $$\,{V_{s1}} = {V_{s2}} = 1 + j0\,\,p.u,\,\, + ve\,\,$$ sequence impedance are $$\,{Z_{s1}} = {Z_{s2}} = 0.... GATE EE 2008 Suppose we define a sequence transformation between ''a-b-c'' and ''p-n-0''' variables as follows:$$\left[ {\matrix{ ...
GATE EE 2007
Three identical star connected resistors of $$1.0$$ $$p.u$$ are connected to an unbalanced $$3$$ phase supply. The load ...
GATE EE 2006
At a $$220$$ kV substation of a power system, it is given that the three-phase fault level is $$4000$$ MVA and single-li...
GATE EE 2005
The parameters of transposed overhead transmission line are given as: self reactance $${X_s} = 0.4\,\,\Omega /km$$ and M...
GATE EE 2005
At a $$220$$ kV substation of a power system, it is given that the three-phase fault level is $$4000$$ MVA and single-li...
GATE EE 2005
A $$3$$-phase generator rated at $$110$$ MVA, $$11$$ kV is connected through circuit breakers to a transformer. The g...
GATE EE 2004
A 500 MVA, 50 Hz, 3-phase turbo-generator produces power at 22 kV. Generator is Y-connected and its neutral is solidly g...
GATE EE 2004
A 3-phase transmission line supplies $$\Delta -$$ connected load Z. The conductor $$'c'$$ of the line develops an open...
GATE EE 2004
A three-phase alternator generating unbalanced voltages is connected to an unbalanced load through a 3-phase transmissio...
GATE EE 2003
A 20-MVA, 6.6-kV, 3-phase alternator is connected to a 3-phase transmission line. The per unit positive sequence, negati...
GATE EE 2003
A generator is connected to a transformer which feeds another transformer through a short feeder. The zero sequence impe...
GATE EE 2002
A $$50$$ Hz alternator is rated $$500$$ $$MVA,$$ $$20$$ $$kV,$$ with $${X_d} = 1.0$$ per unit and $$X'{'_d} = 0.2$$ per ...
GATE EE 2001
The severity of line-to-ground and three phase faults at the terminals of an unloaded synchronous generator is to be sam...
GATE EE 2000
For the network shown in figure the zero sequence reactances in p.u. are indicated. The zero sequence driving point reac...
GATE EE 1998

## Marks 5

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A single line-to-ground fault occurs on an unloaded generator in phase a positive, negative, and zero sequence impedance...
GATE EE 2001
For the configuration shown in figure, the breaker connecting a large system to bus $$2$$ is initially open. The system ...
GATE EE 2000
Determine the required MVA rating of the circuit breaker CB for the system shown in given figure. Consider the grid as i...
GATE EE 1999
Determine the magnitudes of the symmetrical components ($${{{\rm I}_{R1}},\,{{\rm I}_{R2}}\,}$$ and $${{{\rm I}_{R0}}}$$...
GATE EE 1999
In a power-system, the $$3$$-phase fault MVA is always higher than the single-line-ground fault MVA at a bus (State True...
GATE EE 1994

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