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Recent activity in Power Systems
0
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0
answers
1
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 ___________.
retagged
Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
sequenceimpedences
prefaultvoltage
numericalanswers
0
votes
0
answers
2
GATE2016254
An energy meter, having meter constant of $1200$ revolutions/kWh, makes $20$ revolutions in $30$ seconds for a constant load. The load, in $kW$, is __________.
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Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
energymeter
revolutions
constantload
numericalanswers
0
votes
0
answers
3
GATE2016244
A singlephase, $2$ kVA, $100/200$ V transformer is reconnected as an autotransformer such that its $kVA$ rating is maximum. The new rating, in $kVA$, is ______.
retagged
Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
autotransformer
rating
numericalanswers
0
votes
0
answers
4
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 ___________.
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Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
synchronousmotor
powerfactor
powerintake
numericalanswers
0
votes
0
answers
5
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 ____________.
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Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
losslesspowertransmissionline
travelingwave
numericalanswers
+1
vote
0
answers
6
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 _________.
retagged
Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
singlelinediagram
threephasefault
prefaultcondition
numericalanswers
0
votes
0
answers
7
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 ___________.
retagged
Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
balancedsystem
line
currents
numericalanswers
0
votes
0
answers
8
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 ________.
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Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
averagepower
networkanalysis
numericalanswers
0
votes
0
answers
9
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 _________.
retagged
Dec 6, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee2
instantaneousvoltagesource
instantaneouscurrentsource
instantaneouspower
numericalanswers
0
votes
0
answers
10
GATE2016151
A singlephase transmission line has two conductors each of $10$ mm radius. These are fixed at a centertocenter distance of $1$ m in a horizontal plane. This is now converted to a threephase transmission line by introducing a third conductor of the same ... $5$% more than that of the inductance per conductor of the singlephase system. The distance $D$, in meters, is _________.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee1
transmissionsystemdesign
transmissionparameters
transposition
numericalanswers
0
votes
0
answers
11
GATE2016141
A $30 MVA$, $3$phase, $50 Hz$, $13.8 kV$, starconnected synchronous generator has positive, negative and zero sequence reactances, $15$%, $15$% and $5$% respectively. A reactance $(X_{n})$ is connected between the neutral of the generator and ground. A double ... $X_{n}$ (in p.u.) that will limit the positive sequence generator current to $4270$ A is ________.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee1
slip
powersystemfaults
sequencenetworks
numericalanswers
0
votes
0
answers
12
GATE2016140
A threephase cable is supplying $800 kW$ and $600 kVAr$ to an inductive load. It is intended to supply an additional resistive load of $100 kW$ through the same cable without increasing the heat dissipation in the cable, by providing a threephase bank of ... the line voltage is $3.3 kV$, $50 Hz$, the capacitance per phase of the bank, expressed in microfarads, is ________.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee1
activepower
reactivepower
heatlosses
numericalanswers
0
votes
0
answers
13
GATE2016120
The magnitude of threephase fault currents at buses $A$ and $B$ of a power system are $10$ pu and $8$ pu, respectively. Neglect all resistances in the system and consider the prefault system to be unloaded. The prefault voltage at all buses in the system is $1.0$ pu. ... $A$ is $0.8$ pu. The voltage magnitude at bus $A$ during a threephase fault at bus $B$, in pu, is __________.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2016ee1
faultanalysis
powersystembuses
3phaseshortcircuit
numericalanswers
0
votes
0
answers
14
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 _______.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2015ee1
laggingpowerfactor
singlephasetransformers
numericalanswers
0
votes
0
answers
15
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 _________.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2015ee1
shortcircuitfault
synchronousspeed
numericalanswers
0
votes
0
answers
16
GATE2015141
Consider the economic dispatch problem for a power plant having two generating units. The fuel costs in Rs/MWh along with the generation limits for the two units are given below: $C_{1}(P_{1})=0.01P^{2}_{1}+30P_{1}+10 ; 100MW \leq P_{1}\leq 150MW$ ... $200$ MW is _______.
retagged
Dec 4, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2015ee1
economicdispatch
incrementalcost
numericalanswers
0
votes
0
answers
17
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 _______.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee3
linediagrams
faultanalysis
numericalanswers
0
votes
0
answers
18
GATE2014342
The complex power consumed by a constantvoltage load is given by ($P_1$+$jQ_1$), where, $1$ $kW$ ≤$P_1$≤$1.5$ $kW$ and $0.5$ $kVAR$≤ $Q_1$≤ $1$ $kVAR$. A compensating shunt capacitor is chosen such that $Q$≤$0.25$ $kVAR$, where $Q$ is the net reactive power consumed by the capacitorload combination. The reactive power (in $kVAR$) supplied by the capacitor is _________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee3
capacitorloadcombination
numericalanswers
0
votes
0
answers
19
GATE2014341
For a $400$ $km$ long transmission line, the series impedance is ($0.0$ + $j0.5$) $Ω/km$ and the shunt admittance is ($0.0$ + $j5.0$) $μmho$/$km$. The magnitude of the series impedance (in $\Omega$) of the equivalent $\pi$ circuit of the transmission line is ________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee3
long
transmission
line
series
impedance
numericalanswers
0
votes
0
answers
20
GATE2014328
The function $f(x)=e^x1$ is to be solved using NewtonRaphson method. If the initial value of $x_0$ is taken as $1.0$, then the absolute error observed at $2^{nd}$ iteration is _______.
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Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee3
linelosses
iterativemethod
numericalanswers
0
votes
0
answers
21
GATE2014316
A $183$bus power system has $150$ $PQ$ buses and $32$ $PV$ buses. In the general case, to obtain the load flow solution using NewtonRaphson method in polar coordinates, the minimum number of simultaneous equations to be solved is ___________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee3
slackbus
linelosses
numericalanswers
0
votes
0
answers
22
GATE2014243
Three phase $100$ $MVA$ ,$25$ $kV$ generator has solidly grounded neutral. The positive, negative, and the zero sequence reactances of the generator are $0.2$ $pu$, $0.2$ $pu$, and $0.05$ $pu$, respectively, at the machine ... bolted single phase to ground fault occurs at the terminal of the unloaded generator, the fault current in amperes immediately after the fault is _________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
solidlygrounded
zerosequencenetwork
groundfault
numericalanswers
0
votes
0
answers
23
GATE2014241
There are two generators in a power system. Noload frequencies of the generators are $51.5$ $Hz$ and $51$ $Hz$, respectively, and both are having droop constant of $1$ $Hz$/$MW$. Total load in the system is $2.5$ $MW$. Assuming that the generators are operating under their respective droop characteristics, the frequency of the power system in $Hz$ in the steady state is ___________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
powersystemanalysis
powerproduction
numericalanswers
0
votes
0
answers
24
GATE2014240
A synchronous generator is connected to an infinite bus with excitation voltage $E_f$ = $1.3$ $pu$. The generator has a synchronous reactance of $1.1$ $pu$ and is delivering real power $(P)$ of $0.6$ $pu$ to the bus. Assume the infinite bus ... $pu$. Neglect stator resistance. The reactive power $(Q)$ in $pu$ supplied by the generator to the bus under this condition is _________.
retagged
Dec 3, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
infinitebus
realpower
numericalanswers
0
votes
0
answers
25
GATE201426
Two identical coupled inductors are connected in series. The measured inductances for the two possible series connections are $380$ $μH$ and $240$ $μH$. Their mutual inductance in $μH$ is ________
retagged
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
passiveloads
seriesconnection
numericalanswers
0
votes
0
answers
26
GATE2014220
While measuring power of a threephase balanced load by the twowattmeter method, the readings are $100$ $W$ and $250$ $W$. The power factor of the load is ______.
retagged
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
balancedloads
powerfactor
numericalanswers
0
votes
0
answers
27
GATE2014215
A three phase starconnected load is drawing power at a voltage of $0.9$ $pu$ and $0.8$ power factor lagging. The three phase base power and base current are $100$ $MVA$ and $437.384$ $A$ respectively. The linetoline load voltage in $kV$ is ________.
retagged
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
powerfactor
starconnection
numericalanswers
0
votes
0
answers
28
GATE2014212
A single phase, $50$ $kVA$, $1000V$/$100V$ two winding transformer is connected as an autotransformer as shown in the figure. The $kVA$ rating of the autotransformer is _____________.
retagged
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee2
autotransformer
stepdowntransformer
numericalanswers
0
votes
0
answers
29
GATE2014116
A $2$bus system and corresponding zero sequence network are shown in the figure. The transformers $T_1$and $T_2$ are connected as
edited
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee1
sequencenetworks
bussystem
0
votes
0
answers
30
GATE2014145
The Bode magnitude plot of the transfer function $G(s)=\dfrac{K(1+0.5s)(1+as)}{s(1+\frac{s}{8})(1+bs)(1+\frac{s}{36})}$ is shown below: Note that $6dB/octave = 20 dB/decade.$ The value of $\dfrac{a}{bK}$ is ________.
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Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee1
bodeplot
feedbacksystem
numericalanswers
0
votes
0
answers
31
GATE2014143
The overcurrent relays for the line protection and loads connected at the buses are shown in the figure. The relays are $IDMT$ ... setting for relay $R_B$ to be $0.1$ and $5A$ respectively, the operating time of $R_B$ (in seconds) is ______________
retagged
Dec 2, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2014ee1
overcurrent
relays
line
protection
numericalanswers
0
votes
0
answers
32
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 $k^2$ $k$ $1/ k$ $\sqrt{k}$
edited
Nov 29, 2019
in
Power Systems
by
jothee
(
1.4k
points)
gate2013ee
deltaconnection
wyeconnection
0
votes
0
answers
33
GATE2014115
Threephase to ground fault takes place at locations $F_1$ and $F_2$ in the system shown in the figure If the fault takes place at location $F_1$, then the voltage and the current at bus $A$ are $V_{F1}$ and $I_{F1}$ respectively. If the fault takes place at location $F_2$, then the ... $I_{F1}$ and $V_{F2}$ leads $I_{F2}$ $V_{F1}$ lags $I_{F1}$ and $V_{F2}$ lags $I_{F2}$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
singlelinediagram
powerfactor
0
votes
0
answers
34
GATE2014119
Power consumed by a balanced $3$phase, $3$wire load is measured by the two wattmeter method. The first wattmeter reads twice that of the second. Then the load impedance angle in radians is $\pi /12$ $\pi /8$ $\pi /6$ $\pi /3$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
balancedsystem
load
impedance
0
votes
0
answers
35
GATE2014114
The undesirable property of an electrical insulating material is high dielectric strength High relative permittivity high thermal conductivity High insulation resistivity
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
insulation
powersystemanalysis
conductingwires
0
votes
0
answers
36
GATE2014131
In an unbalanced three phase system, phase current $I_a=1\angle (90^{\circ})\: \text{pu}$ , negative sequence current $I_{b2}=4\angle (150^{\circ})\: \text{pu}$, zero sequence current $I_{c0}=3\angle 90^{\circ}\: \text{pu}.$ The magnitude of phase current $I_b$ in $\text{pu}$ is $1.00$ $7.81$ $11.53$ $13.00$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
unbalancedsystem
sequencenetworks
0
votes
0
answers
37
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 $100\:A$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
singlelinediagram
distribution
feeder
0
votes
0
answers
38
GATE2014141
A two bus power system shown in the figure supplies load of $1.0+j0.5\: \text{p.u}.$ The values of $V_1$ in $\text{p.u.}$ and $\delta_2$ respectively are $0.95$ and $6.00^{\circ}$ $1.05$ and $5.44^{\circ}$ $1.1$ and $6.00^{\circ}$ $1.1$ and $27.12^{\circ}$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
powersystemanalysis
reactance
0
votes
0
answers
39
GATE2014142
The fuel cost functions of two power plants are Plant $P_1 : C_1=0.05Pg_1^2+APg_1+B$ Plant $P_2 : C_2=0.10Pg_2^2+3APg_2+2B$ where, $P_{g1}$ and $P_{g2}$ are the generated powers of two plants, and $A$ and $B$ are the constants. If the two plants optimally share $1000\:MW$ load ... cost of $100$ $Rs/MWh$, the ratio of load shared by plants $P_1$ and $P_2$ is $1:4$ $2:3$ $3:2$ $4:1$
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
power
plants
powergeneration
0
votes
0
answers
40
GATE2014139
A three phase synchronous generator is to be connected to the infinite bus. The lamps are connected as shown in the figure for the synchronization. The phase sequence of bus voltage is $RYB$ ... bus same as infinite bus and its frequency is more than infinite bus same as infinite bus and its frequency is less than infinite bus
edited
Nov 21, 2019
in
Power Systems
by
Lakshman Patel RJIT
(
120
points)
gate2014ee1
infinite
bus
synchronization
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