Write the relation between phase and line current, phase and line voltage for Star connection.
Last Answer : Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection
Show More
377 views
2 answers
asked
Aug 11, 2018
by
anonymous
What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.
Show More
125 views
0 answers
asked
Aug 11, 2018
by
anonymous
What is the difference between line and phase voltage?
Last Answer : Line voltage is voltage between two phases R &Y (415 v) while phase voltage is the voltage between one phase and a neutral B & N (240 v).
Show More
207 views
1 answer
asked
Mar 10, 2018
by
anonymous
For 11kV line the inductance per km per phase will be of the order of: (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH
Last Answer : For 11kV line the inductance per km per phase will be of the order of: 1 mH
Show More
1.0k views
1 answer
asked
May 8, 2018
by
anonymous
Last Answer : Reactance relay is preferred for phase fault on short transmission line.
Show More
110 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Impedance relays are used for phase faults on long line.
Show More
82 views
1 answer
asked
Mar 20, 2018
by
anonymous
What is the difference between line and phase current?
Last Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current
Show More
132 views
1 answer
asked
Mar 10, 2018
by
anonymous
For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed
Show More
203 views
0 answers
asked
Aug 12, 2018
by
anonymous
Is the power line voltage available in our homes a dc or an ac voltage?
Last Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.
Show More
5.2k views
1 answer
asked
Jun 29, 2019
by
anonymous
What is the difference between a line voltage and low voltage control system?
Show More
117 views
0 answers
asked
Mar 10, 2018
by
anonymous
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Show More
219 views
0 answers
asked
Apr 16, 2020
by
anonymous
Draw the waveform of three phase AC supply voltage.
Show More
212 views
0 answers
asked
Aug 11, 2018
by
anonymous
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm
Show More
756 views
1 answer
asked
Apr 28, 2018
by
anonymous
.jpg)
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last Answer : In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.
Show More
524 views
1 answer
asked
Mar 18, 2018
by
anonymous
Why the read of 3 phase voltage is 440?
Last Answer : The read of a phase voltage should be approximatly 240v. This is because line voltage equals to quberoot of phase voltage.
Show More
96 views
1 answer
asked
Mar 10, 2018
by
anonymous
Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Last Answer : The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.
Show More
3.5k views
1 answer
asked
Feb 14, 2018
by
anonymous
What is a three phase connection?
Last Answer : RYB, 440 volt/phase
Show More
132 views
1 answer
asked
Dec 22, 2017
by
anonymous
.jpg)
96 views
0 answers
asked
Jan 21, 2020
by
Shubham
.jpg)
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
Last Answer : Vscos¢s-Vrcos¢r=IR
Show More
3.0k views
2 answers
asked
Apr 28, 2018
by
anonymous
A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he
Last Answer : A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52
Show More
367 views
1 answer
asked
May 3, 2018
by
anonymous
The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%
Last Answer : The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%
Show More
319 views
1 answer
asked
Apr 25, 2018
by
anonymous
The product of apparent power and cosine of the phase angle between circuit voltage and current is?
Last Answer : In parllpar reasonans RLC circuit the current is
Show More
647 views
2 answers
asked
Mar 25, 2018
by
anonymous
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that?
Last Answer : The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that both waves must have same frequency.
Show More
782 views
1 answer
asked
Mar 24, 2018
by
anonymous
.jpg)
The power consumed in a circuit element will be least when the phase difference between the current and voltage is?
Last Answer : The power consumed in a circuit element will be least when the phase difference between the current and voltage is 90°.
Show More
942 views
1 answer
asked
Mar 24, 2018
by
anonymous
For 11 kV line the capacitance per km per phase will be of the order of: (A) 1 Farad (B) 0.1 Farad (C) 0.01 Farad (D) 0.01 microF
Last Answer : For 11 kV line the capacitance per km per phase will be of the order of: 0.01 Farad
Show More
439 views
1 answer
asked
May 8, 2018
by
anonymous
For the women: Does a mans chin and jaw line effect whether he's more attractive?
Last Answer : I like a nice strong chin but it’s not a deal-breaker by any means.
Show More
1 view
1 answer
asked
Feb 27
by
anonymous
How to Spool Line Onto a Reel
Last Answer : How to Spool Line Onto a Reel If you think of fishing as a sport or a hobby, you must always make sure that you have efficient fishing tools with you all the time. Your fishing rod must ... you'll always have good quality fishing line and an efficient fishing reel to use during your fishing trips.
Show More
5 views
1 answer
How to Replace Edge Trimmer Line
Last Answer : How to Replace Edge Trimmer Line An edge trimmer line is a very efficient equipment for any avid gardener. This small diameter line, usually made of plastic or other material, cuts various vegetation, ... your edge trimmer lines regularly. It'll save you time and give you a great-looking landcaping.
Show More
9 views
1 answer
How to Repair a Brake Line
Last Answer : How to Repair a Brake Line Vehicles that often travel to colder, up-north states often have their brake lines damaged, because of the salt that melts the ice on the roads. The salt corrodes the car' ... should be done as soon as possible. Otherwise, you might end up in worst brake problems later on.
Show More
4 views
1 answer
asked
May 11, 2021
by
anonymous
State the limitations of EHVAC transmission line.
Last Answer : Following are the Limitations of EHVAC Transmission: 1. Insulation cost increases as voltage increases 2. Skin effect is more 3. Proximity effect is more. 4. Corona loss increases. 5. Radio ... 18. EHVAC is economical only for bulk amount of power is to be transmitted over long distance.
Show More
318 views
1 answer
asked
May 22, 2020
by
anonymous
List the properties of line insulators in brief
Last Answer : Following are the properties of line insulators: A) Electrical Properties of insulating material:- 1. It should have high resistance. 2. It should have high breakdown voltage. 3. It should have high ... of insulating material:- 1. It should have longer life. 2. It should have low cost
Show More
67 views
1 answer
asked
May 22, 2020
by
anonymous
State line parameters of transmission line.
Last Answer : Following are the of Line parameters of transmission line: 1. Resistance 2. Inductance 3. Capacitance
Show More
70 views
1 answer
asked
May 22, 2020
by
anonymous
.jpg)
State the meaning of Single line diagram.
Last Answer : Meaning of Single line diagram: The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data ( ... breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.
Show More
76 views
1 answer
asked
May 22, 2020
by
anonymous
State the impact of inductance and resistance on transmission line performance
Last Answer : Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected
Show More
188 views
1 answer
asked
May 6, 2020
by
anonymous
effect of inductance and capacitance on performance of transmission line.
Last Answer : Following are the effect on performance of transmission line: 1. Due to inductance (L) voltage drop in transmission line produces. 2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.
Show More
136 views
1 answer
asked
Aug 25, 2019
by
anonymous
While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method.
Last Answer : (i) Assumptions are made in case of Nominal 'T' Method: a. It is assume that line capacitance is connected at center of transmission line. b. It is assume that half ... assumed that transmission line resistance & reactance per phase is connected in between two half transmission line capacitance
Show More
172 views
1 answer
asked
Aug 25, 2019
by
anonymous
requirements or properties of the line supports used in transmission and distribution.
Last Answer : Following are requirements or properties of the line supports used in transmission and distribution. 1. High mechanical strength:- It should have high mechanical strength to withstand against - ... . 8. Appearance: It should have good appearance or They must be of pleasing shape
Show More
111 views
1 answer
asked
Aug 25, 2019
by
anonymous
HVDC transmission line in India:
Last Answer : HVDC transmission line in India: S.N . From To Voltage 1 Rihand (U.P) (from 1990) Dadri +- 500 KV (bipolar) 2 Talcher- is the biggest ... (Chandrapur) Western Region 140KV 8 Connecting Southern region(Vizag- Gajuwaka) Eastern Region 140KV
Show More
102 views
1 answer
asked
Aug 25, 2019
by
anonymous
effect of line parameter on performance of transmission line.
Last Answer : Following are the effect of line parameter on performance of transmission line: 1. Due to resistance (R), voltage drop in transmission line & copper losses in transmission line ... transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.
Show More
76 views
1 answer
asked
Aug 25, 2019
by
anonymous
Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?
Last Answer : 10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are ... voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.
Show More
186 views
3 answers
asked
Aug 18, 2019
by
anonymous
Define line regulation and load regulation.
Last Answer : Load regulation is the ability of the power supply to maintain its specified output voltage over changes in the load. Line regulation is the ability of the power supply to maintain its specified output voltage over changes in the input line voltage.
Show More
326 views
3 answers
asked
Jul 24, 2019
by
anonymous
Define load and line regulation.
Last Answer : 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.
Show More
101 views
1 answer
asked
Sep 5, 2018
by
anonymous
A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9
Last Answer : A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9
Show More
294 views
1 answer
asked
Jun 18, 2018
by
anonymous
The command line interpreter that enables the users to interact with operating system is called the A) Window B) Shell C) Process D) Kernel
Last Answer : The command line interpreter that enables the users to interact with operating system is called the Shell
Show More
87 views
1 answer
asked
Jun 18, 2018
by
anonymous
Stability of a transmission line can be increased by
Last Answer : Stability of a transmission line can be increased by Shunt capacitor, Series capacitor
Show More
363 views
1 answer
asked
May 8, 2018
by
anonymous
The sag of a transmission line is least affected by (A) Self weight of the conductor. (B) Temperature of the surrounding air. (C) Current through the conductor. (D) Ice deposited on the conductor.
Last Answer : The sag of a transmission line is least affected by Current through the conductor.
Show More
153 views
1 answer
asked
May 8, 2018
by
anonymous
Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.
Last Answer : Shunt compensation in an EHV line is used to Improve the voltage profile.
Show More
5.3k views
1 answer
asked
May 8, 2018
by
anonymous
In a transmission line if booster transformers are to be used, preferred location will be (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line
Last Answer : In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point
Show More
346 views
1 answer
asked
May 8, 2018
by
anonymous
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of
Last Answer : A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U
Show More
451 views
1 answer
asked
May 3, 2018
by
anonymous
The surge impedance for over head line is taken as (1) 10-20 ohms (2) 50-60 ohms (3) 100-200 ohms (4) 1000-2000 ohms
Last Answer : The surge impedance for over head line is taken as 100-200 ohms
Show More
108 views
1 answer
asked
May 1, 2018
by
anonymous
