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Recent questions and answers in Power system

2 answers 63 views

An RLC series. circuit remains predominantly inductive

answered 6 days ago in Power system
2 answers 95 views

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

answered May 10 in Power system
1 answer 17 views

It is always economical to improve the power factor of an electric installation to (a) zero (b) unity (c) a little less than unity (d) a little more than unity 

answered Aug 14, 2018 in Power system
1 answer 21 views

 A power system is subjected to a fault which makes the zero sequence component of current equal to zero. The nature of fault current is: A) Double line to ground fault B) Line to line fault C) Line to ground fault D) Three-phase to ground fault

answered Jun 17, 2018 in Power system
1 answer 12 views

The melting point of carbon is: A) 1800 degree Centigrade B) 2200 degree Centigrade C) 3500 degree Centigrade D) 5500 degree Centigrade

answered Jun 17, 2018 in Power system
1 answer 25 views

A DC reactor is connected in series with each pole of a converter station in order to: A) prevent commutation failures in the inverter B) supply reactive power to the converter C) improve system stability D) increase the power transfer capability

answered Jun 17, 2018 in Power system
1 answer 13 views

Which statement out of the following statements about ‘corona’ is incorrect? A) Corona gives rise to radio interference B) Corona results in loss of power in transmission C) Corona discharge can be observed as red luminescence D) Corona is always accompanied by a hissing voice

answered Jun 17, 2018 in Power system
1 answer 64 views

The inertia constant of a 100 MVA, 11 kV water wheel generator is 4. The energy stored in the rotor at the synchronous speed is: A) 400 Mega Joule B) 400 Kilo Joule C) 25 Mega Joule D) 25 Kilo Joule

answered Jun 17, 2018 in Power system
0 answers 46 views

A plant with 10 MW installed capacity produces an annual output of 6 × 6 10 kWh and remains in operation for 2000 hours in a year. The Plant Use Factor is (A) 0.33 % (B) 3.33 % (C) 15 % (D) 30 % 

asked Jun 4, 2018 in Power system
0 answers 8 views

The overhead radial distribution is preferred to (A) reduce voltage fluctuations (B) increase service reliability (C) distribute power at low voltage (D) distribute power to long distances 

asked Jun 4, 2018 in Power system
0 answers 430 views

The base kV and base MVA are halved and the per unit impedance new value is 0.5. The per unit impedance of the original circuit element is (A) 0.25 (B) 0.5 (C) 0.625 (D) 1.0 

asked Jun 4, 2018 in Power system
0 answers 20 views

In the load flow analysis, a Jacobian is a matrix of size n × n with (A) constant elements (B) upper triangular constant elements (C) first partial derivative elements (D) second partial derivative elements 

asked Jun 4, 2018 in Power system
0 answers 39 views

The effect of corona is less by using (A) overhead lines of large conductor size (B) under ground cable of small conductor size (C) overhead lines having less spacing between conductors (D) overhead lines of higher voltages 

asked Jun 4, 2018 in Power system
0 answers 20 views

A synchronous condenser is used at the receiving end of a transmission line for (A) supplying lagging kVA (B) voltage control (C) frequency control (D) maintaining a higher voltage than at the sending end 

asked Jun 4, 2018 in Power system
0 answers 12 views

Real power flow in transmission lines is controlled by (A) tap changing transformer (B) voltage regulating transformer (C) phase-angle regulating transformer (D) booster transformer 

asked Jun 4, 2018 in Power system
0 answers 11 views

The voltage profile of a n-bus power system can be improved by controlling the (A) load angles (B) active power flows (C) reactive power flows (D) complex power flows 

asked Jun 4, 2018 in Power system
0 answers 13 views

Transient stability can be improved by using governors attached to the turbines, should be (a) fast acting (b) slow acting (c) no function of governors in improving stability (d) nothing can be said  

asked May 25, 2018 in Power system
0 answers 33 views

In case of load flow analysis one of the system buses is taken as swing bus (a) as reference bus (b) to compensate the system losses (c) both (a) and (b) (d) to reduce the system losses 

asked May 25, 2018 in Power system
0 answers 10 views

A power system is represented by its system matrix ZBUS (m × m). Now an element is added in power system network without creating a new node. The dimension of the new impedance matrix will be (a) m × m (b) (m + 1) × (m + 1) (c) (m – 1) × (m – 1) (d) (m + 2) × (m + 2)  

asked May 25, 2018 in Power system
0 answers 17 views

The inductance of a line is minimum when (a) GMD is high (b) GMR is high (c) Both (a) and (b) (d) GMD is low, but GMR is high

asked May 25, 2018 in Power system
0 answers 4 views

Surge impedance loading of a line is proportional to  

asked May 25, 2018 in Power system
0 answers 27 views

The d.c. resistance of a conductor due to skin effect is (a) unchanged (b) decreased (c) increased (d) infinite 

asked May 25, 2018 in Power system
0 answers 20 views

The zero sequence current of a generator for line to ground fault is j 2.4 p.u. The current through the neutral during the fault is (a) j 0.8 p.u (b) j 2.4 p.u. (c) j 0.24 p.u. (d) j 7.2 p.u. 

asked May 25, 2018 in Power system
0 answers 56 views

A power system network with a capacity of 100 MVA has a source impedance of 10% at a point. The fault level at that point is (a) 1500 MVA (b) 1000 MVA (c) 500 MVA (d) 100 MVA

asked May 25, 2018 in Power system
0 answers 50 views

Load flow study of a power system is mainly carried out for (a) fault calculations (b) stability studies (c) system planning and operation (d) load frequency control 

asked May 25, 2018 in Power system
1 answer 19 views

A 20-MVA, 6.6-kV, 3-phase alternator is connected to a 3-phase transmission line. The per unit positive-sequence, negative-sequence and zero-sequence impedances of the alternator are j0.1, j0.1 and j0.04 respectively. The neutral of the alternator is connected to ground through an inductive reactor of j0.05 p.u. The per unit positive-, ... The voltage of the alternator neutral with respect to ground during the fault is  (A) 513.8 V (B) 889.9 V (C) 1112.0 V (D) 642.2 V

answered May 25, 2018 in Power system
1 answer 14 views

A 3-phase 11 kV generator feeds power to a constant power unity power factor load of 100 MW through a 3-phase transmission line. The line-to line voltage at the terminals of the machine is maintained constant at 11 kV. The per unit positive sequence impedance of the line based on 100 MVA and 11 kV is j0.2. The line to line voltage at the ... load to increase the line-to-line voltage at the load terminals to 11 kV is  (A) 100 MVAR (B) 10.1 MVAR (C) -100 MVAR (D) -10.1 MVAR

answered May 25, 2018 in Power system
1 answer 15 views

Choose two appropriate auxiliary components of a HVDC transmission system from the following P. D.C line inductor Q. A.C line inductor R. Reactive power sources S. Distance relays on D.C line T. Series capacitance on A.C. line  (A) P and Q (B) P and R (C) Q and S (D) S and T

answered May 25, 2018 in Power system
1 answer 22 views

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the number of poles required in the generator are (A) 6 (B) 12 (C) 16 (D) 24

answered May 25, 2018 in Power system
1 answer 42 views

A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor. Suddenly a fault occurs reducing in electric power output by 40%. Neglect losses and assume constant power input to the shaft. The accelerating torque in the generator in MNm at the time of fault will be  (A) 1.528 (B) 1.018 (C) 0.848 (D) 0.509

answered May 25, 2018 in Power system
1 answer 20 views

A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of the line, its ideal power transfer capability in MW is (A) 1204 MW (B) 1504 MW (C) 2085 MW (D) 2606 MW

answered May 25, 2018 in Power system
1 answer 16 views

The transmission line distance protection relay having the property of being inherently directional is (A) impedance relay (B) MHO relay (C) OHM relay (D) reactance relay

answered May 25, 2018 in Power system
1 answer 11 views

For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjustable vanes is  (A) Kaplan (B) Francis (C) Pelton (D) Impeller

answered May 25, 2018 in Power system
1 answer 8 views

In the thermal power plants, the pressure in the working fluid cycle is developed by  (A) condenser (B) super heater (C) feed water pump (D) turbine

answered May 25, 2018 in Power system
1 answer 20 views

At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of service, the load power factor becomes (A) 0.85 (B) 1.00 (C) 0.80 lag (D) 0.90 lag

answered May 25, 2018 in Power system
1 answer 8 views

High Voltage DC (HVDC) transmission is mainly used for  (A) bulk power transmission over very long distances (C) inter-connecting two systems with same nominal frequency (C) eliminating reactive power requirement in the operation (D) minimizing harmonics at the converter stations

answered May 25, 2018 in Power system
1 answer 21 views

An 800 kV transmission line has a maximum power transfer capacity of P. If it is operated at 400 kV with the series reactance unchanged, the new maximum power transfer capacity is approximately (A) P (B) 2P (C) P / 2 (D) P / 4

answered May 25, 2018 in Power system
1 answer 15 views

The p.u. parameter for a 500 MVA machine on its own base are: inertia, M = 20 p.u. ; reactance, X = 2 p.u. The p.u. values of inertia and reactance on 100 MVA common base, respectively, are (A) 4, 0.4 (B) 100, 10 (C) 4, 10 (D) 100, 0.4

answered May 25, 2018 in Power system
1 answer 26 views

A generator is connected through a 20 MVA, 13.8/138 kV step down transformer, to a transmission line. At the receiving end of the line a load is supplied through a step down transformer of 10 MVA, 138/69 kV rating. A 0.72 pu. load, evaluated on load side transformer ratings as base values , is supplied from the above system. For system base values of 10 MVA and 69 kV in load circuit, the value of the load (in per unit) in generator will be (A) 36 (B) 1.44 (C) 0.72 (D) 0.18

answered May 25, 2018 in Power system
0 answers 50 views

A single phase transmission line and a telephone line are both symmetrically strung one below the other, in horizontal configurations, on a common tower, The shortest and longest distances between the phase and telephone conductors are 2.5 m and 3 m respectively. The voltage (volt/km) induced in the telephone circuit, due to 50 Hz current of 100 amps in the power circuit is (A) 4.81 (B) 3.56 (C) 2.29 (D) 1.27

asked May 25, 2018 in Power system
1 answer 13 views

An HVDC link consist of rectifier, inverter transmission line and other equipments. Which one of the following is true for this link ?  (A) The transmission line produces/ supplies reactive power (B) The rectifier consumes reactive power and the inverter supplies reactive power from/ to the respective connected ... power to/ from the respective connected AC systems (D) Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems

answered May 25, 2018 in Power system
1 answer 25 views

A loss less transmission line having Surge Impedance Loading (SIL) of 2280 MW is provided with a uniformly distributed series capacitive compensation of 30%. Then, SIL of the compensated transmission line will be (A) 1835 MW (B) 2280 MW (C) 2725 MW (D) 3257 MW

answered May 25, 2018 in Power system
0 answers 15 views

Voltages phasors at the two terminals of a transmission line of length 70 km have a magnitude of 1.0 per unit but are 180 degree out of phase. Assuming that the maximum load current in the line is 1/5th of minimum 3-phase fault current. Which one of the following transmission line protection schemes ... pick up at 1.25 times the maximum load current (C) Pilot relaying system with directional comparison scheme (D) Pilot relaying system with segregated phase comparison scheme

asked May 25, 2018 in Power system
1 answer 59 views

A three-phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is  (A) 1200 A (B) 3600 A (C) 35 kA (D) 104.8 kA

answered May 25, 2018 in Power system
1 answer 11 views

For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a  (A) Series inductive compensator in the line (B) Shunt inductive compensator at the receiving end (C) Series capacitive compensator in the line (D) Shunt capacitive compensator at the sending end

answered May 25, 2018 in Power system
1 answer 21 views

A negative sequence relay is commonly used to protect  (A) an alternator (B) an transformer (C) a transmission line (D) a bus bar

answered May 25, 2018 in Power system
1 answer 67 views

A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite bus voltage is 1 pu. The inertia constant of the generator is 5 MW -s MVA / and the generator reactance is 1 pu. The critical clearing angle, in degrees, for a three-phase dead short circuit fault at the generator terminal is  (A) 53.5 (B) 60.2 (C) 70.8 (D) 79.6

answered May 25, 2018 in Power system
0 answers 308 views

Two generating stations G1 and G2 of ratings 10 MVA and 8 MVA respectively are linked by a line rated at 5 MVA, 0.1 Pu reactance. Each station has a reactance of 0.5 pu. If the base MVA is 10 MVA, short-circuit MVA of G1 is

asked May 24, 2018 in Power system
1 answer 249 views

If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the latter run, the system losses  A) Will be unchanged but complex bus voltages will change B) Will change but complex bus voltage remain unchanged C) As well as complex bus voltage will changed D) As well as complex bus voltage will be unchanged

answered May 20, 2018 in Power system
1 answer 8 views

Which material is used in controlling chain reaction in a nuclear reactor?  A) Thorium B) Uranium C) Boron D)Beryllium

answered May 20, 2018 in Power system
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