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Hot questions in Power Systems
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1
GATE2015217
A 3bus power system network consists of 3 transmission lines. The bus admittance matrix of the uncompensated system is $\begin{bmatrix} j6 &j3 &j4 \\ j3&j7 &j5 \\ j4& j5 & j8 \end{bmatrix}$ pu. If the shunt capacitance of all transmission ... $−j7.0$ $−j8.5$ $−j7.5$ $−j9.0$
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2015ee2
busadmittancematrix
selfadmittance
mutual
admittance
0
votes
0
answers
2
GATE2015143
A $50$ Hz generating unit has Hconstant of $2$ MJ/MVA. The machine is initially operating in steady state at synchronous speed, and producing $1$ pu of real power. The initial value of the rotor angle $\delta$ is 5°, when a bolted three phase to ground short ... input mechanical power to remain at $1$ pu, the value of $\delta$ in degrees, $0.02$ second after the fault is _________.
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2015ee1
shortcircuitfault
synchronousspeed
numericalanswers
0
votes
0
answers
3
GATE201345
A $4$ – pole induction motor, supplied by a slightly unbalanced threephase $50 Hz$ source, is rotating at $1400\:rpm$. The electrical frequency in $Hz$ of the induced negative sequence current in the rotor is $100$ $98$ $52$ $48$
asked
Feb 12, 2017
in
Power Systems
by
piyag476
(
1.5k
points)
gate2013ee
salientpoles
sequencecurrent
0
votes
0
answers
4
GATE201347
When the $\text{NewtonRaphson}$ method is applied to solve the equation $f(x)=x^3+2x1=0$ ,the solution at the end of the first iteration with the initial guess value as $x_0$ =$1.2$ is $0.82$ $0.49$ $0.705$ $1.69$
asked
Feb 12, 2017
in
Power Systems
by
piyag476
(
1.5k
points)
gate2013ee
iterativetechniques
linelosses
0
votes
0
answers
5
GATE201352
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 $j1$ $\Omega.$ The voltage phase angles in rad at buses $2$ and $3$ ... $\theta _2=0,\theta _3=0.1$ $\theta _2=0.1,\theta _3=0.1$ $\theta _2=0.1,\theta _3=0.2$
asked
Feb 12, 2017
in
Power Systems
by
piyag476
(
1.5k
points)
gate2013ee
pvbuses
pqbuses
0
votes
0
answers
6
GATE201319
Consider a $\delta$ connection of resistors and its equivalent star connection as shown below. If all elements of the delta connection are scaled by a factor $k, k > 0$, the elements of the corresponding star equivalent will be scaled by a factor of $k^2$ $k$ $1/ k$ $\sqrt{k}$
asked
Feb 12, 2017
in
Power Systems
by
piyag476
(
1.5k
points)
gate2013ee
deltaconnection
wyeconnection
0
votes
0
answers
7
GATE2014343
The figure shows the single line diagram of a single machine infinite bus system. The inertia constant of the synchronous generator $H$=$5$ $MWs$/$MVA$. Frequency is$50$ $Hz$. Mechanical power is $1$ $pu$. The system is operating at the stable equilibrium point with rotor ... of fault clearing are $45^{\circ}$ and $3.762$ $radian/s$ respectively, then $P_{max}$ (in $pu$) is _______.
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2014ee3
linediagrams
faultanalysis
numericalanswers
0
votes
0
answers
8
GATE2014140
A distribution feeder of $1\:km$ length having resistance, but negligible reactance, is fed from both the ends by $400V$, $50\:Hz$ balanced sources. Both voltage sources $S_1$ and $S_2$ ... $25\:A$ $50\:A$ and $50\:A$ $25\:A$ and $75\:A$ $0\:A$ and $100\:A$
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2014ee1
singlelinediagram
distribution
feeder
0
votes
0
answers
9
GATE2015151
Two singlephase transformers $T_{1}$ and $T_{2}$ each rated at $500$ kVA are operated in parallel. Percentage impedances of $T_{1}$ and $T_{2}$ are $(1 + j6)$ and $(0.8 + j4.8)$, respectively. To share a load of $1000$ kVA at $0.8$ lagging power factor, the contribution of $T_{2}$ (in kVA) is _______.
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2015ee1
laggingpowerfactor
singlephasetransformers
numericalanswers
0
votes
0
answers
10
GATE2015112
A steady current $I$ is flowing in the $x$ direction through each of two infinitely long wires at $y = ± \frac{L}{2}$ as shown in the figure. The permeability of the medium is $\mu_{0}$. The $\vec{B}$field at $(0,L,0)$ is $\frac{4\mu _{0}I}{3\Pi L} \hat{Z}$ $+\frac{4\mu _{0}I}{3\Pi L} \hat{Z}$ $0$ $\frac{3\mu _{0}I}{4\Pi L} \hat{Z}$
asked
Feb 12, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2015ee1
permeability
steadycurrent
0
votes
0
answers
11
GATE2016121
Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an overexcited condition and a directly gridconnected induction generator. Consider capacitive $VAr$ ... is a source and induction generator and synchronous generator are sinks of reactive power. All are sources of reactive power.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee1
unitypowerfactor
sourceofreactivepower
load
0
votes
0
answers
12
GATE2016253
Two identical unloaded generators are connected in parallel as shown in the figure. Both the generators are having positive, negative and zero sequence impedances of $j0.4$ p.u., $j0.3$ p.u. and $j0.15$ p.u., respectively. If the prefault voltage is $1$ p.u., for a linetoground $(LG)$ fault at the terminals of the generators, the fault current, in p.u., is ___________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
sequenceimpedences
prefaultvoltage
numericalanswers
+1
vote
0
answers
13
GATE2016238
The single line diagram of a balanced power system is shown in the figure. The voltage magnitude at the generator internal bus is constant and $1.0$ p.u. The p.u. reactances of different components in the system are also shown in the figure ... can be transferred during the prefault condition to the maximum real power that can be transferred under the faulted condition is _________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
singlelinediagram
threephasefault
prefaultcondition
numericalanswers
0
votes
0
answers
14
GATE2016236
In the balanced $3$phase, $50$ Hz, circuit shown below, the value of inductance $(L)$ is $10$ mH. The value of the capacitance $(C)$ for which all the line currents are zero, in millifarads, is ___________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
balancedsystem
line
currents
numericalanswers
0
votes
0
answers
15
GATE2016240
At no load condition, a $3$phase, $50$ Hz, lossless power transmission line has sendingend and receivingend voltages of $400$ kV and $420$ kV respectively. Assuming the velocity of traveling wave to be the velocity of light, the length of the line, in km, is ____________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
losslesspowertransmissionline
travelingwave
numericalanswers
0
votes
0
answers
16
GATE2016235
The $z$parameters of the two port network shown in the figure are $z_{11}=40\Omega, z_{12}=60\Omega, z_{21}=80\Omega$ and $z_{22}=100\Omega$. The average power delivered to $R_{L}=20\Omega$, in watts, is ________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
averagepower
networkanalysis
numericalanswers
0
votes
0
answers
17
GATE2016241
The power consumption of an industry is $500$ kVA, at $0.8$ p.f. lagging. A synchronous motor is added to raise the power factor of the industry to unity. If the power intake of the motor is $100$ kW, the p.f. of the motor is ___________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
synchronousmotor
powerfactor
powerintake
numericalanswers
0
votes
0
answers
18
GATE2016212
The voltage $(V)$ and current $(A)$ across a load are as follows. $v(t)=100\sin$ (ωt), $i(t)=10\sin(ωt60°) + 2\sin(3ωt)+5\sin(5ωt)$ The average power consumed by the load, in $W$, is _________.
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
instantaneousvoltagesource
instantaneouscurrentsource
instantaneouspower
numericalanswers
0
votes
0
answers
19
GATE2016213
A power system with two generators is shown in the figure below. The system (generators, buses and transmission lines) is protected by six overcurrent relays $R_{1}$ to $R_{6}$. Assuming a mix of directional and nondirectional relays at appropriate locations, the remote backup relays for $R_{4}$ are $R_{1}, R_{2}$ $R_{2}, R_{6}$ $R_{2}, R_{5}$ $R_{1}, R_{6}$
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
powersystemprotection
magnitudecomparisonrelays
zoneofprotection
pickupcurrent
0
votes
0
answers
20
GATE2016215
The inductance and capacitance of a $400$ kV, threephase, $50$ Hz lossless transmission line are $1.6$ mH/km/phase and $10$ nF/km/phase respectively. The sending end voltage is maintained at $400$ kV. To maintain a voltage of $400$ kV at the receiving end, when the line is delivering $300$ MW load, the shunt compensation required is Capacitive Inductive Resistive Zero
asked
Jan 30, 2017
in
Power Systems
by
makhdoom ghaya
(
9.3k
points)
gate2016ee2
surgeimpedence
steadystateoperation
equivalentcircuit
stabilitylimits
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