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Hot questions in Power Systems
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61
GATE Electrical 2016 Set 2 | Question: 35
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 ________.
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...
makhdoom ghaya
9.4k
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makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-2
average-power
network-analysis
numerical-answers
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0
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0
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62
GATE Electrical 2016 Set 2 | Question: 15
The inductance and capacitance of a $400$ kV, three-phase, $50$ 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 ... at the receiving end, when the line is delivering $300$ MW load, the shunt compensation required is Capacitive Inductive Resistive Zero
The inductance and capacitance of a $400$ kV, three-phase, $50$ Hz lossless transmission line are $1.6$ mH/km/phase and $10$ nF/km/phase respectively. The sending end vol...
makhdoom ghaya
9.4k
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makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-2
surge-impedence
steady-state-operation
equivalent-circuit
stability-limits
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0
votes
0
answers
63
GATE Electrical 2016 Set 2 | Question: 40
At no load condition, a $3$-phase, $50$ Hz, lossless power transmission line has sending-end and receiving-end 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 ____________.
At no load condition, a $3$-phase, $50$ Hz, lossless power transmission line has sending-end and receiving-end voltages of $400$ kV and $420$ kV respectively. Assuming th...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-2
lossless-power-transmission-line
traveling-wave
numerical-answers
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–
0
votes
0
answers
64
GATE Electrical 2016 Set 2 | Question: 12
The voltage $(V)$ and current $(A)$ across a load are as follows. $v(t)=100\sin$ (ωt), $i(t)=10\sin(ωt-60°) + 2\sin(3ωt)+5\sin(5ωt)$ The average power consumed by the load, in $W$, is _________.
The voltage $(V)$ and current $(A)$ across a load are as follows.$v(t)=100\sin$ (ωt),$i(t)=10\sin(ωt-60°) + 2\sin(3ωt)+5\sin(5ωt)$The average power consumed by the l...
makhdoom ghaya
9.4k
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makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-2
instantaneous-voltage-source
instantaneous-current-source
instantaneous-power
numerical-answers
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0
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0
answers
65
GATE Electrical 2016 Set 1 | Question: 51
A single-phase transmission line has two conductors each of $10$ mm radius. These are fixed at a center-to-center distance of $1$ m in a horizontal plane. This is now converted to a three-phase transmission line by introducing a third ... more than that of the inductance per conductor of the single-phase system. The distance $D$, in meters, is _________.
A single-phase transmission line has two conductors each of $10$ mm radius. These are fixed at a center-to-center distance of $1$ m in a horizontal plane. This is now con...
makhdoom ghaya
9.4k
points
makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-1
transmission-system-design
transmission-parameters
transposition
numerical-answers
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–
0
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0
answers
66
GATE Electrical 2016 Set 2 | Question: 54
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 __________.
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 __________.
makhdoom ghaya
9.4k
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makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-2
energy-meter
revolutions
constant-load
numerical-answers
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–
0
votes
0
answers
67
GATE Electrical 2016 Set 2 | Question: 14
A power system has $100$ buses including $10$ generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian is $189 \times 189$ $100 \times 100$ $90 \times 90$ $180 \times 180$
A power system has $100$ buses including $10$ generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian is$18...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-2
taylor's-theorem
bus-admittance-matrix
pq-buses
pv-buses
acceleration-factor
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0
votes
0
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68
GATE Electrical 2016 Set 1 | Question: 41
A $30 MVA$, $3$-phase, $50 Hz$, $13.8 kV$, star-connected 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 ... The value of $X_{n}$ (in p.u.) that will limit the positive sequence generator current to $4270 \: A$ is ________.
A $30 MVA$, $3$-phase, $50 Hz$, $13.8 kV$, star-connected synchronous generator has positive, negative and zero sequence reactances, $15\%$, $15\%$ and $5\%$ respectively...
makhdoom ghaya
9.4k
points
makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-1
slip
power-system-faults
sequence-networks
numerical-answers
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–
0
votes
0
answers
69
GATE Electrical 2016 Set 1 | Question: 42
If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then $V_{AB}$ leads $V_{ab}$ by $60^\circ$ $V_{AB}$ lags $V_{ab}$ by $60^\circ$ $V_{AB}$ leads $V_{ab}$ by $30^\circ$ $V_{AB}$ lags $V_{ab}$ by $30^\circ$
If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then$V_{AB}$ leads $V_{ab}$ by $60^\circ$$V_{AB}$ lags $V_{a...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-1
sequence-voltages
star-to-delta-conversion
120-phase-shift
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–
0
votes
0
answers
70
GATE Electrical 2016 Set 1 | Question: 40
A three-phase 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 three- ... voltage is $3.3 kV$, $50 Hz$, the capacitance per phase of the bank, expressed in microfarads, is ________.
A three-phase 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 wi...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-1
active-power
reactive-power
heat-losses
numerical-answers
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–
0
votes
0
answers
71
GATE Electrical 2016 Set 2 | Question: 44
A single-phase, $2$ kVA, $100/200$ V transformer is reconnected as an auto-transformer such that its $kVA$ rating is maximum. The new rating, in $kVA$, is ______.
A single-phase, $2$ kVA, $100/200$ V transformer is reconnected as an auto-transformer such that its $kVA$ rating is maximum. The new rating, in $kVA$, is ______.
makhdoom ghaya
9.4k
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makhdoom ghaya
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Jan 29, 2017
Power Systems
gate2016-ee-2
auto-transformer
rating
numerical-answers
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–
0
votes
0
answers
72
GATE Electrical 2016 Set 1 | Question: 19
In a $100$ bus power system, there are $10$ generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the $PV$ buses are converted to $PQ$ type. In this iteration, The ... decreases by two. The number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two.
In a $100$ bus power system, there are $10$ generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the $PV$ buses are ...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-1
power-system-operation
iterations
jacobi-matrix
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–
0
votes
0
answers
73
GATE Electrical 2016 Set 1 | Question: 49
A single-phase, $22 kVA, 2200 V/ 220 V, 50 Hz$, distribution transformer is to be connected as an auto-transformer to get an output voltage of $2420 V$. Its maximum $kVA$ rating as an autotransformer is $22$ $24.2$ $242$ $2420$
A single-phase, $22 kVA, 2200 V/ 220 V, 50 Hz$, distribution transformer is to be connected as an auto-transformer to get an output voltage of $2420 V$. Its maximum $kVA$...
makhdoom ghaya
9.4k
points
makhdoom ghaya
asked
Jan 29, 2017
Power Systems
gate2016-ee-1
leakage-reactance
transformation-ratio
magnetization-branch
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