Capacitance Voltage Transformer (CVT) is used to

reduce losses in a transmission line

improve the power factor of the transmission

reduce losses in a transmission line

connect instruments on the LT side

reduce the incidence of overvoltage surges on transmission lines

The use of high-speed circuit-breakers

reduces the short circuit current

increases the short circuit current

For protection of rotating machines against lighting surges a combination of

lighting arrester alone is used

lighting conductor and capacitor are used

lighting conductor and lighting arrester are used

lighting arrester and capacitor are used

lighting arrester alone is used

To limit cur rent chopping in vacuum circuit breakers, the contact material used has

high vapour pressure and low conductivity properties

high vapour pressure and high conductivity properties

low vapour pressure and high conductivity properties

low vapour pressur e and low conductivity properties

For t he same rupturing capacity, the actual current to be interrupted by an HRC fuse is

much more than any circuit breaker

much less than any circuit breaker

much more than any circuit breaker

The current chopping tendency is minimised by using the SF6 gas at relatively

high pressure and high velocity

Precautions are essential for ensuring that the secondary of a CT is not open circuited when the primary circuit carries a current because

the ferromagnetic core may develop residual magnetism

dangerously high voltage might develop across the secondary

the ferromagnetic core may develop residual magnetism

the reflected impedance may prevent the flow of current in the primary circuit

At a particular unbalanced node, the real powers specified are leaving the node: 20 MW, 25 MW, Entering the node: 60 MW, 30 MW. The balance power will be

22.5MW entering the node and 22.5 MW leaving the node

For a 500 Hz frequency excitation, a 50 km long power line will be modelled as

data is not sufficient decision

A loss less line terminated with its surge impedance has

transmission line angle is greater than actual length of line

transmission line angle is less than the actual length

For any fixed degree of inductive shunt compensation, additional series capacitive compensation

increases effective length of line

increases virtual surge impedance line

decreases virtual surge impedance loading of the line

Three generators are feeding a load of 100 MW. The details of the generators are given below.

Generat or -2 will share more power compared to Generator-3

All the generators will share equal power

Generat or -3 will share more power compared to Generator-1

Generat or -1 will share more power compared to generator-2

Generat or -2 will share more power compared to Generator-3

Voltage phasors at the two terminals of a transmissi on line of length 70 k m have a magnitude of 1.0 per unit but are 180 degrees out of phase. Assuming that the maximum load current in the line is 1 5 th of minimum 3-phase fault current, which one of the following transmission line protection schemes will NOT pick up for this condition?

Directional overcurrent protection set to pick up at 1.25 times the maximum load current

Distance protection using mho relays with zone-1 set to 80% of the line impedance

Directional overcurrent protection set to pick up at 1.25 times the maximum load current

Pilot relaying system with directional comparison scheme

Pilot relaying system with segregated phase comparison scheme

A 230 V (phase), 50 Hz, three - phase, 4 wire system has a phase sequence ABC. A unity power - factor load of 4 kW is connected between phase A and neutral N. It is desired to achieve zero neutral current through the use of a pure inductor and a pure capacitor in the other two phase. The value of inductor and capacitor is

42.12 mH in phase C and 240.79 F in phase B

72.95 mH in phase C and 139.02 F in phase B

72.95 mH in phase B and 139.02 F in phase C

42.12 mH in phase C and 240.79 F in phase B

42.12 mH in phase B and 240.79 F in phase C

In a biased differential relay, the bias is defined as a ratio of

fault current and operating coil current

number of turns of restraining and operating coil

operating coil current and restraining coil current

fault current and operating coil current

fault current and restraining coil current

An HVDC link consists of rectifier, inverter transmission line and other equipments. Which one of the following is true for this link?

Rectifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems

The transmission line produces/supplies reactive power

The rectifier consumes reactive power and the inverter supplies reactive power from/to the respective connected AC systems

Rectifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems

Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems

249 + Mcqs in Power systems miscellaneous in Power Systems Page 5 McqOptions

201.	Capacitance Voltage Transformer (CVT) is used to
A.	improve the power factor of the transmission
B.	reduce losses in a transmission line
C.	connect instruments on the LT side
D.	reduce the incidence of overvoltage surges on transmission lines
Answer» B. reduce losses in a transmission line

Discussion

202.	The use of high-speed circuit-breakers
A.	reduces the short circuit current
B.	improves system stability
C.	decreases system stability
D.	increases the short circuit current
Answer» C. decreases system stability

Discussion

203.	The unit protection scheme provides
A.	primary protection
B.	back up protection
C.	simultaneous protection
D.	remote protection
Answer» B. back up protection

Discussion

204.	For protection of rotating machines against lighting surges a combination of
A.	lighting conductor and capacitor are used
B.	lighting conductor and lighting arrester are used
C.	lighting arrester and capacitor are used
D.	lighting arrester alone is used
Answer» D. lighting arrester alone is used

Discussion

205.	The capacitor switching is easily done with
A.	air blast circuit breaker
B.	oil circuit breaker
C.	vacuum circuit breaker
D.	any one of these
Answer» D. any one of these

Discussion

206.	To limit cur rent chopping in vacuum circuit breakers, the contact material used has
A.	high vapour pressure and low conductivity properties
B.	high vapour pressure and high conductivity properties
C.	low vapour pressure and high conductivity properties
D.	low vapour pressur e and low conductivity properties
Answer» E.

Discussion

207.	For t he same rupturing capacity, the actual current to be interrupted by an HRC fuse is
A.	much less than any circuit breaker
B.	much more than any circuit breaker
C.	equal to the circuit breaker
D.	none of these
Answer» B. much more than any circuit breaker

Discussion

208.	The current chopping tendency is minimised by using the SF6 gas at relatively
A.	high pressure and low velocity
B.	high pressure and high velocity
C.	low pressure and low velocity
D.	low pressure and high velocity
Answer» D. low pressure and high velocity

Discussion

209.	Resistance switching in normally employed in
A.	all breakers
B.	bulk oil breakers
C.	minimum oil breakers
D.	air blast circuit breakers
Answer» E.

Discussion

210.	If the excitation of the synchronous generator fails, it acts as a
A.	synchronous motor
B.	synchronous generator
C.	induction motor
D.	induction generator
Answer» E.

Discussion

211.	The following sequence currents were recorded in a power system under a fault condition:
A.	line to ground
B.	three phase
C.	line to line ground
D.	line to line
Answer» D. line to line

Discussion

212.	Precautions are essential for ensuring that the secondary of a CT is not open circuited when the primary circuit carries a current because
A.	dangerously high voltage might develop across the secondary
B.	the ferromagnetic core may develop residual magnetism
C.	the reflected impedance may prevent the flow of current in the primary circuit
D.	none of these
Answer» B. the ferromagnetic core may develop residual magnetism

Discussion

213.	In the protection of transformers, harmonic restraint is used to guard against
A.	magnetizing inrush current
B.	unbalanced operation
C.	lightning
D.	switching over voltages
Answer» E.

Discussion

214.	Zero sequence currents can flow from a line into a transformer bank if the windings are in
A.	ground star/ delta
B.	delta/ star
C.	star/ grounded star
D.	delta/ delta
Answer» B. delta/ star

Discussion

215.	A motor is receiving 25% of the power that it is capable of receiving from an infinite bus. If load of the motor is doubled, then maximum value of during swinging of the rotor ar ound it s new equilibrium position will be
A.	40
B.	> 30
C.	< 30
D.	25
Answer» C. < 30

Discussion

216.	At a particular unbalanced node, the real powers specified are leaving the node: 20 MW, 25 MW, Entering the node: 60 MW, 30 MW. The balance power will be
A.	30 MW leaving the node
B.	45 MW leaving the node
C.	45 MW entering the node
D.	22.5MW entering the node and 22.5 MW leaving the node
Answer» C. 45 MW entering the node

Discussion

217.	A shunt reactor at 100 MVAr is operated at 98% of its rated voltage and at 96% of its rated frequency. The reactive power absorbed by the reactor is
A.	98 MVAr
B.	104.02 MVAr
C.	96.04 MVAr
D.	100.04 MVAr
Answer» E.

Discussion

218.	For a 500 Hz frequency excitation, a 50 km long power line will be modelled as
A.	short line
B.	medium line
C.	long line
D.	data is not sufficient decision
Answer» D. data is not sufficient decision

Discussion

219.	The insulation level of 400 kV EHV overhead transmission line is decided on the basis of
A.	lightning overvoltage
B.	switching overvoltage
C.	corona inception voltage
D.	radio and TV interference
Answer» C. corona inception voltage

Discussion

220.	For certain geometry and operating voltage of the uncompensated transmission line, the ratio of power transfer capability to the surge inpedance loading with increase in length
A.	increases
B.	remains unchanged
C.	decreases
D.	uncertain
Answer» D. uncertain

Discussion

221.	A loss less line terminated with its surge impedance has
A.	flat voltage profile
B.	transmission line angle is greater than actual length of line
C.	transmission line angle is less than the actual length
D.	both (a) and (b)
Answer» B. transmission line angle is greater than actual length of line

Discussion

222.	For any fixed degree of inductive shunt compensation, additional series capacitive compensation
A.	increases effective length of line
B.	increases virtual surge impedance line
C.	decreases virtual surge impedance loading of the line
D.	none of these
Answer» E.

Discussion

223.	What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 ? It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.
A.	10.0 sec
B.	1.92 sec
C.	4.5 sec
D.	2.4 sec
Answer» C. 4.5 sec

Discussion

224.	A 100 km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is
A.	8.06 ohms per phase
B.	0.806 ohms per phase
C.	0.0806 ohms per phase
D.	80.6 ohms per phase
Answer» B. 0.806 ohms per phase

Discussion

225.	The conductor of a 10 km long, single phase, two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm. If the conductors are of copper, the inductance of the circuit is ________ mH
A.	238
B.	2.38
C.	23.8
D.	0.238
Answer» D. 0.238

Discussion

226.	What is the maximum value of a load which consume 500 kWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the maximum demand?
A.	52.08 kW
B.	50.8 kW
C.	4.5 kW
D.	60 kW
Answer» B. 50.8 kW

Discussion

227.	The impedance of a circuit is given by z = 3 + j4. Its conductance will be ___________
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>25</center></td></tr><tr><td style="text-align: center;">2</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td></tr><tr><td style="text-align: center;">25</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td></tr><tr><td style="text-align: center;">25</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>25</center></td></tr><tr><td style="text-align: center;">3</td></tr></table>
Answer» C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td></tr><tr><td style="text-align: center;">25</td></tr></table>

Discussion

228.	A balanced three-phase voltage is applied to a star-connected induction motor, the phase to neutral voltage being V. The stator resistance, rotor resistance referred to the stator, stator leakage reactance, rotor leakage reactance refer red to the stator, and the magnet izing reactance are denoted by r
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;"> <span style=" text-decoration: overline;">(r<sub>s</sub> + r'<sub>r</sub>) + (X<sub>s</sub> + X'<sub>r</sub>) </span></td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;"> r<sub>s</sub> + (X<sub>s</sub> + X<sub>m</sub>) </td></tr></table>
C.
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;"> <span style=" text-decoration: overline;">(r<sub>s</sub> + r<sub>r</sub>) + (X<sub>m</sub> + X<sub>r</sub>) </span></td></tr></table>
E.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;"> r<sub>s</sub> + (X<sub>m</sub> + X<sub>r</sub>) </td></tr></table>
Answer» B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>V</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;"> r<sub>s</sub> + (X<sub>s</sub> + X<sub>m</sub>) </td></tr></table>

Discussion

229.	Consider two buses connected by an impedance of (0 + j5) . The bus 1 voltage is 100 30 V, and bus 2 voltage is 100 0 V. The real and reactive power supplied by bus 1, respectively are
A.	1000 W, 268 VAr
B.	1000 W, 134VAr
C.	276.9 W, 56.7 VAr
D.	276.9 W, 56.7 VAr
Answer» B. 1000 W, 134VAr

Discussion

230.	A three-phase, 33 kV oil circuit breaker is rated 1200 A, 2000 M VA, 3s. The symmetrical breaking current is
A.	1200 A
B.	3600 A
C.	35 kA
D.	104.8 kA
Answer» D. 104.8 kA

Discussion

231.	Out of the following plant categories
A.	(i) and (ii)
B.	(ii) and (iii)
C.	(i), (ii) and (iv)
D.	(i), (ii) and (iv)
Answer» D. (i), (ii) and (iv)

Discussion

232.	For a fixed value of complex power flow in a transmissi on line having a sending end voltage V, the real powerloss will be proportional to
A.	V
B.	V
C.	1/V
D.	1/V
Answer» D. 1/V

Discussion

233.	Three generators are feeding a load of 100 MW. The details of the generators are given below.
A.	All the generators will share equal power
B.	Generat or -3 will share more power compared to Generator-1
C.	Generat or -1 will share more power compared to generator-2
D.	Generat or -2 will share more power compared to Generator-3
Answer» D. Generat or -2 will share more power compared to Generator-3

Discussion

234.	A 500 M W, 21 k V, 50 H z, 3-phase, 2-pole synchronous generator having a rated p.f.= 0.9 has a moment of inertia of 27.5 10 kg-m . The inertia constant (H) will be
A.	2.44 s
B.	2.71 s
C.	4.88 s
D.	5.42 s
Answer» B. 2.71 s

Discussion

235.	An extra high voltage transmission line of length 300 km can be approximated by a lossless line having propagation constant = 0.00127 radians per km. Then percentage ratio of line length to wavelength will be given by
A.	24.24%
B.	12.12%
C.	19.05%
D.	6.06%
Answer» E.

Discussion

236.	Voltage phasors at the two terminals of a transmissi on line of length 70 k m have a magnitude of 1.0 per unit but are 180 degrees out of phase. Assuming that the maximum load current in the line is 1 5 th of minimum 3-phase fault current, which one of the following transmission line protection schemes will NOT pick up for this condition?
A.	Distance protection using mho relays with zone-1 set to 80% of the line impedance
B.	Directional overcurrent protection set to 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
Answer» B. Directional overcurrent protection set to pick up at 1.25 times the maximum load current

Discussion

237.	A logssless transmission line having Sure 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
Answer» C. 2725 MW

Discussion

238.	The total reactance and total susceptance of a lossless overhead EHV line, operating at 50 Hz, are given by 0.045 pu and 1.2 pu respectively. If the velocity of wave propagation is 3 10
A.	122 km
B.	185 km
C.	222 km
D.	272 km
Answer» C. 222 km

Discussion

239.	A 230 V (phase), 50 Hz, three - phase, 4 wire system has a phase sequence ABC. A unity power - factor load of 4 kW is connected between phase A and neutral N. It is desired to achieve zero neutral current through the use of a pure inductor and a pure capacitor in the other two phase. The value of inductor and capacitor is
A.	72.95 mH in phase C and 139.02 F in phase B
B.	72.95 mH in phase B and 139.02 F in phase C
C.	42.12 mH in phase C and 240.79 F in phase B
D.	42.12 mH in phase B and 240.79 F in phase C
Answer» C. 42.12 mH in phase C and 240.79 F in phase B

Discussion

240.	An isolated 50 Hz synchronous generator is rated at 15 MW which is also the maximum continuous power limit of its prime mover. It is equipped with a speed governor with 5% droop. Initially, the generator is feeding three loads of 4 MW each at 50 Hz. One of these loads is programmed to trip permanently if the frequency falls below 48 Hz. If an additional load of 3.5 MW is connected, then frequency will settle down to
A.	49.417 Hz
B.	49.917 Hz
C.	50.083 Hz
D.	50.583 Hz
Answer» D. 50.583 Hz

Discussion

241.	In a biased differential relay, the bias is defined as a ratio of
A.	number of turns of restraining and operating coil
B.	operating coil current and restraining coil current
C.	fault current and operating coil current
D.	fault current and restraining coil current
Answer» C. fault current and operating coil current

Discussion

242.	An HVDC link consists 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 AC systems
C.	Rectifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems
D.	Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems
Answer» C. Rectifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems

Discussion

243.	A generator is connected t hr ough 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 M VA, 138/69 kV rating. A 0.72 puload, 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 circuit will be
A.	36
B.	1.44
C.	0.72
D.	0.18
Answer» B. 1.44

Discussion

244.	A single phase transmission line and a telephone line are both symmetrically strung one below the other, in horizontal configurations, on a common t ower. The shor t est and l ongest distances between the phase and telephone conductors are 2.5 m and 3 m respectively. The volt age (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
Answer» D. 1.27

Discussion

245.	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:
A.	2.0
B.	0.20
C.	0.02
D.	20
Answer» E.

Discussion

246.	The A, B, C, D constants of a 220 kV line are:
A.	5
B.	9
C.	16
D.	21
Answer» D. 21

Discussion

247.	There are two generators in a power system. N o-l oad fr equenci es of t he gener at or s ar e 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 M W. Assuming that the generators are operating under their respective droop characteristics, the frequency of the power system in Hz in the steady state is ________.
A.	0.20 Hz.
B.	50 Hz.
C.	0.50 Hz.
D.	5.020 Hz.
Answer» C. 0.50 Hz.

Discussion

248.	A three phase star-connected 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 437.38 A respectively. The line-to-line load voltage in kV is ______.
A.	118.8 KV
B.	11 KV
C.	1188 KV
D.	11588 KV
Answer» B. 11 KV

Discussion

249.	The incremental costs (in Rupees/M Wh) of operating two generating units are functions of their respective powers P
A.	130
B.	1360
C.	1.036
D.	136.36
Answer» E.

Discussion

Explore topic-wise MCQs in Power Systems.

Capacitance Voltage Transformer (CVT) is used to

The use of high-speed circuit-breakers

The unit protection scheme provides

For protection of rotating machines against lighting surges a combination of

The capacitor switching is easily done with

To limit cur rent chopping in vacuum circuit breakers, the contact material used has

For t he same rupturing capacity, the actual current to be interrupted by an HRC fuse is

The current chopping tendency is minimised by using the SF6 gas at relatively

Resistance switching in normally employed in

If the excitation of the synchronous generator fails, it acts as a

The following sequence currents were recorded in a power system under a fault condition:

Precautions are essential for ensuring that the secondary of a CT is not open circuited when the primary circuit carries a current because

In the protection of transformers, harmonic restraint is used to guard against

Zero sequence currents can flow from a line into a transformer bank if the windings are in

A motor is receiving 25% of the power that it is capable of receiving from an infinite bus. If load of the motor is doubled, then maximum value of during swinging of the rotor ar ound it s new equilibrium position will be

At a particular unbalanced node, the real powers specified are leaving the node: 20 MW, 25 MW, Entering the node: 60 MW, 30 MW. The balance power will be

A shunt reactor at 100 MVAr is operated at 98% of its rated voltage and at 96% of its rated frequency. The reactive power absorbed by the reactor is

For a 500 Hz frequency excitation, a 50 km long power line will be modelled as

The insulation level of 400 kV EHV overhead transmission line is decided on the basis of

For certain geometry and operating voltage of the uncompensated transmission line, the ratio of power transfer capability to the surge inpedance loading with increase in length

A loss less line terminated with its surge impedance has

For any fixed degree of inductive shunt compensation, additional series capacitive compensation

What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay setting of 125% Tms = 0.6 ? It is connected to a supply circuit through a CT, 400 ratio. The fault current is 4000 amp.

A 100 km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is

The conductor of a 10 km long, single phase, two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm. If the conductors are of copper, the inductance of the circuit is ________ mH

What is the maximum value of a load which consume 500 kWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the maximum demand?

The impedance of a circuit is given by z = 3 + j4. Its conductance will be ___________

Consider two buses connected by an impedance of (0 + j5) . The bus 1 voltage is 100 30 V, and bus 2 voltage is 100 0 V. The real and reactive power supplied by bus 1, respectively are

A three-phase, 33 kV oil circuit breaker is rated 1200 A, 2000 M VA, 3s. The symmetrical breaking current is

Out of the following plant categories

For a fixed value of complex power flow in a transmissi on line having a sending end voltage V, the real powerloss will be proportional to

Three generators are feeding a load of 100 MW. The details of the generators are given below.

A 500 M W, 21 k V, 50 H z, 3-phase, 2-pole synchronous generator having a rated p.f.= 0.9 has a moment of inertia of 27.5 10 kg-m . The inertia constant (H) will be

An extra high voltage transmission line of length 300 km can be approximated by a lossless line having propagation constant = 0.00127 radians per km. Then percentage ratio of line length to wavelength will be given by

A logssless transmission line having Sure 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

The total reactance and total susceptance of a lossless overhead EHV line, operating at 50 Hz, are given by 0.045 pu and 1.2 pu respectively. If the velocity of wave propagation is 3 10

In a biased differential relay, the bias is defined as a ratio of

An HVDC link consists of rectifier, inverter transmission line and other equipments. Which one of the following is true for this link?

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:

The A, B, C, D constants of a 220 kV line are:

A three phase star-connected 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 437.38 A respectively. The line-to-line load voltage in kV is ______.

The incremental costs (in Rupees/M Wh) of operating two generating units are functions of their respective powers P