Hot questions in Power Systems / GO Electrical

0 votes

0 answers

1

GATE Electrical 2015 Set 1 | Question: 23
The primary mmf is least affected by the secondary terminal conditions in a Power transformer. Potential transformer. Current transformer. Distribution transformer.

The primary mmf is least affected by the secondary terminal conditions in aPower transformer.Potential transformer.Current transformer.Distribution transformer.

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

2

GATE Electrical 2014 Set 3 | Question: 15
For a fully transposed transmission line positive, negative and zero sequence impedances are equal positive and negative sequence impedances are equal zero and positive sequence impedances are equal negative and zero sequence impedances are equal

For a fully transposed transmission linepositive, negative and zero sequence impedances are equalpositive and negative sequence impedances are equalzero and positive sequ...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

3

GATE Electrical 2013 | Question: 8
A single-phase load is supplied by a single-phase voltage source. If the current flowing from the load to the source is $10\angle -150^0\: A$ and if the voltage at the load terminals is $100\angle 60^0\: V$, ... absorbs real power and absorbs reactive power. Load delivers real power and delivers reactive power. Load delivers real power and absorbs reactive power.

A single-phase load is supplied by a single-phase voltage source. If the current flowing from the load to the source is $10\angle -150^0\: A$ and if the voltage at the lo...

piyag476

1.6k points

piyag476 asked Feb 11, 2017

0 votes

0 answers

4

GATE Electrical 2014 Set 1 | Question: 14
The undesirable property of an electrical insulating material is high dielectric strength High relative permittivity high thermal conductivity High insulation resistivity

The undesirable property of an electrical insulating material ishigh dielectric strengthHigh relative permittivityhigh thermal conductivityHigh insulation resistivity

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

5

GATE Electrical 2014 Set 1 | Question: 19
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 $\pi /12$ $\pi /8$ $\pi /6$ $\pi /3$

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...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

6

GATE Electrical 2014 Set 2 | Question: 16
Shunt reactors are sometimes used in high voltage transmission systems to limit the short circuit current through the line. compensate for the series reactance of the line under heavily loaded condition. limit over-voltages at the load side under lightly loaded condition. compensate for the voltage drop in the line under heavily loaded condition.

Shunt reactors are sometimes used in high voltage transmission systems tolimit the short circuit current through the line.compensate for the series reactance of the line ...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

7

GATE Electrical 2014 Set 3 | Question: 16
A $183$-bus power system has $150$ $PQ$ buses and $32$ $PV$ buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coordinates, the minimum number of simultaneous equations to be solved is ___________.

A $183$-bus power system has $150$ $PQ$ buses and $32$ $PV$ buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coordinates,...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

8

GATE Electrical 2014 Set 3 | Question: 53
A three-phase fully controlled bridge converter is fed through star-delta transformer as shown in the figure. The converter is operated at a firing angle of $300$. Assuming the load current $(I_0)$ to be virtually constant at $1 \: p.u$. and transformer to be an ideal one, the input phase current waveform is

A three-phase fully controlled bridge converter is fed through star-delta transformer as shown in the figure.The converter is operated at a firing angle of $300$. Assumin...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

9

GATE Electrical 2014 Set 3 | Question: 14
In a long transmission line with $r$,$l$,$g$ and $c$ are the resistance, inductance, shunt conductance and capacitance per unit length, respectively, the condition for distortionless transmission is $rc=lg$ $r=\sqrt{l/c}$ $rg=lc$ $g=\sqrt{c/l}$

In a long transmission line with $r$,$l$,$g$ and $c$ are the resistance, inductance, shunt conductance and capacitance per unit length, respectively, the condition for di...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

10

GATE Electrical 2014 Set 3 | Question: 41
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 ________.

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 ...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

11

GATE Electrical 2013 | Question: 53
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 $j1$ $\Omega.$ If the base impedance and the line- ... , then the real power in $MW$ delivered by the generator connected at the slack bus is $-10$ $0$ $10$ $20$

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...

piyag476

1.6k points

piyag476 asked Feb 11, 2017

0 votes

0 answers

12

GATE Electrical 2014 Set 1 | Question: 16
A $2$-bus system and corresponding zero sequence network are shown in the figure. The transformers $T_1$and $T_2$ are connected as

A $2$-bus system and corresponding zero sequence network are shown in the figure. The transformers $T_1$and $T_2$ are connected as

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

13

GATE Electrical 2014 Set 1 | Question: 43
The overcurrent relays for the line protection and loads connected at the buses are shown in the figure. The relays are $IDMT$ ... relay $R_B$ to be $0.1$ and $5A$ respectively, the operating time of $R_B$ (in seconds) is ______________

The overcurrent relays for the line protection and loads connected at the buses are shown in the figure.The relays are $IDMT$ in nature having the characteristic$t_{op}=\...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

14

GATE Electrical 2015 Set 1 | Question: 41
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: ... $200 \: MW$ is _______.

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 give...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

15

GATE Electrical 2015 Set 1 | Question: 44
A sustained three-phase fault occurs in the power system shown in the figure. The current and voltage phasors during the fault (on a common reference), after the natural transients have died down, are also shown. Where is the fault located? Location $P$ Location $Q$ Location $R$ Location $S$

A sustained three-phase fault occurs in the power system shown in the figure. The current and voltage phasors during the fault (on a common reference), after the natural ...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

16

GATE Electrical 2015 Set 2 | Question: 6
A $3$-phase balanced load which has a power factor of $0.707$ is connected to a balanced supply. The power consumed by the load is $5$ kW. The power is measured by the two-wattmeter method. The readings of the two wattmeters are $3.94$ kW and $1.06$ kW $2.50$ kW and $2.50$ kW $5.00$ kW and $0.00$ kW $2.96$ kW and $2.04$ kW

A $3$-phase balanced load which has a power factor of $0.707$ is connected to a balanced supply. The power consumed by the load is $5$ kW. The power is measured by the tw...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

17

GATE Electrical 2014 Set 3 | Question: 24
A non-ideal voltage source $V_s$ has an internal impedance of $Z_s$. If a purely resistive load is to be chosen that maximizes the power transferred to the load, its value must be $0$ real part of $Z_s$ magnitude of $Z_s$ magnitude of $Z_s$

A non-ideal voltage source $V_s$ has an internal impedance of $Z_s$. If a purely resistive load is to be chosen that maximizes the power transferred to the load, its valu...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

18

GATE Electrical 2014 Set 1 | Question: 39
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 $R-Y-B$ and that of incoming generator voltage ... infinite bus and its frequency is more than infinite bus same as infinite bus and its frequency is less than infinite bus

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 ...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

19

GATE Electrical 2014 Set 1 | Question: 15
Three-phase 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 ... $I_{F1}$ and $V_{F2}$ leads $I_{F2}$ $V_{F1}$ lags $I_{F1}$ and $V_{F2}$ lags $I_{F2}$

Three-phase to ground fault takes place at locations $F_1$ and $F_2$ in the system shown in the figureIf the fault takes place at location $F_1$, then the voltage and the...

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017

0 votes

0 answers

20

GATE Electrical 2015 Set 1 | Question: 17
Base load power plants are P: wind farms. Q: run-of-river plants. R: nuclear power plants. S: diesel power plants. P, Q and S only P, R and S only P, Q and R only Q and R only

Base load power plants areP: wind farms.Q: run-of-river plants.R: nuclear power plants.S: diesel power plants.P, Q and S onlyP, R and S onlyP, Q and R onlyQ and R only

makhdoom ghaya

9.4k points

makhdoom ghaya asked Feb 11, 2017