Answer :
The interaction between a transmission line and communication line is minimized by transposing transmission as well as communication lines, increasing the height of the transmission line tower, increasing the distance between the two lines.
asked
Mar 20, 2018
by
anonymous
Description : Pure inductive circuit takes power from the A.C. line when?
Answer :
It takes power when voltage decreases and current increases.
asked
Mar 25, 2018
by
anonymous
Description : A lightening arrester connected between the line and earth in a power system (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it
Answer :
A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges
asked
Apr 29, 2018
by
anonymous
Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Answer :
Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.
asked
Mar 25, 2018
by
anonymous
Description : The steady state error of the system can be minimized by
Answer :
The steady state error of the system can be minimized by increasing gain k
asked
Apr 26, 2018
by
anonymous
Description : How eddy current can be minimized?
asked
Mar 15, 2018
by
anonymous
Description : What is the difference between line and phase current?
Answer :
The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current
asked
Mar 10, 2018
by
anonymous
Description : What is the difference between line and phase voltage?
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).
asked
Mar 10, 2018
by
anonymous
Description : What is the difference between a line voltage and low voltage control system?
asked
Mar 10, 2018
by
anonymous
Description : The reactive power transfer over a line mainly depends on
Answer :
The reactive power transfer over a line mainly depends on lVsl- lVRl
asked
Apr 27, 2018
by
anonymous
Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as
Answer :
For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line
asked
Apr 29, 2018
by
anonymous
Description : Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: (A) Delta-Star (B) Star-Delta (C) Delta-Delta (D) Star-Star
Answer :
Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: Star-Star
asked
May 8, 2018
by
anonymous
Description : What is the relationship between power and resistance?
Answer :
P = I2R Where P = power I = Current R = Resistance
asked
Mar 15, 2018
by
anonymous
Description : What is the relationship between power and current?
Answer :
P = I2R Where P = power I = Current R = Resistance This the relationship between current and power.
asked
Mar 15, 2018
by
anonymous
Description : Is the power line voltage available in our homes a dc or an ac voltage?
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.
asked
Jun 29, 2019
by
anonymous
Description : What is a high tension power line?
Answer :
High tension power line is a high voltage of 115 kv and power line is underground transimissio used by urbun areas
asked
Mar 10, 2018
by
anonymous
Answer :
In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.
asked
Mar 21, 2018
by
anonymous
Description : A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be
Answer :
A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular
asked
Apr 29, 2018
by
anonymous
Description : Stability of a transmission line can be increased by
Answer :
Stability of a transmission line can be increased by Shunt capacitor, Series capacitor
asked
May 8, 2018
by
anonymous
Answer :
Discrimination between main and back up protection is provided by the use of relays which are slow.
asked
Mar 20, 2018
by
anonymous
Description : The rate of rise of current through an inductive coil is maximum?
Answer :
The rate of rise of current through an inductive coil is maximum at the start of the current flow.
asked
Mar 25, 2018
by
anonymous
Description : In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will?
Answer :
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will be doubled.
asked
Mar 25, 2018
by
anonymous
Description : In a purely inductive circuit?
Answer :
In a purely inductive circuit actual power is zero.
asked
Mar 25, 2018
by
anonymous
Description : In a pure inductive circuit?
Answer :
Voltage lagging in inductor
asked
Mar 25, 2018
by
anonymous
Description : Time constant of an inductive circuit?
Answer :
Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.
asked
Mar 25, 2018
by
anonymous
Description : Pure inductive circuit?
Answer :
Pure inductive circuit takes power from the line during some part of the cycle and then returns back to it during other part of the cycle.
asked
Mar 25, 2018
by
anonymous
Answer :
A transmission line is protected by distance protection, time graded and current graded overcurrent protection.
asked
Mar 19, 2018
by
anonymous
Description : State advantages and disadvantages of fiber optic communication
Answer :
Advantage of fiber optic communication: 1.Greater information capacity/ higher bandwidth OFC's are capable of transmitting several gigabits per second over hundreds of miles allowing millions of ... are not flexible 7.Requiring more protection around the fiber cable compared with copper cable
asked
Aug 8, 2019
by
anonymous
Description : What is the meaning of Electronics and Communication Engineering?
asked
Mar 10, 2018
by
anonymous
Description : Briefly explain how the power factor of an inductive circuit can be improved.
Answer :
As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.
asked
May 17, 2020
by
anonymous
Answer :
The steady state stability of the power system can be increased by connecting lines in parallel.
asked
Mar 20, 2018
by
anonymous
Description : State the need of modulation in communication system.
Answer :
Need of modulation:- 1. To reduce the height of antenna 2. To avoids mixing of signals 3. To increases the range of communication 4. To make multiplexing of maximum signal is possible 5. To improve the quality of reception
asked
Aug 3, 2019
by
anonymous
Description : Explain Inter-process Communication (IPC) using mailbox/queue.
Answer :
Inter-process communication using mailbox: Mailbox is the Interprocess communication mechanism. A process puts a data message for another process in the mailbox. Mailbox is also called as message exchange. ... a message. In mailbox IPC the sender need not to know the name of the receiver.
Description : What are the types of electronic communication?
asked
Mar 10, 2018
by
anonymous
Description : What is the definition of electronic communication?
asked
Mar 10, 2018
by
anonymous
Description : For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is
Answer :
For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is 0.707 lead
asked
Apr 30, 2018
by
anonymous
Answer :
In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
asked
Mar 20, 2018
by
anonymous
Description : What is the difference between relay and contactor?
Answer :
Relay have smaller ratings. Contactor is a high rating relay.
asked
May 2, 2018
by
anonymous
Description : ln HRC fuse the time between cut-off and final current zero is called
Answer :
ln HRC fuse the time between cut-off and final current zero is called the arcing time
asked
Apr 26, 2018
by
anonymous
Description : What is the difference between a switch and a relay?
Answer :
Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .
asked
Dec 17, 2017
by
anonymous
Description : 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
Answer :
The surge impedance for over head line is taken as 100-200 ohms
asked
May 1, 2018
by
anonymous
Description : lf a travelling-wave travelling along a loss-less overhead line does not result in any reflection after it has reached the far end, then the far end of the line is
Answer :
lf a travelling-wave travelling along a loss-less overhead line does not result in any reflection after it has reached the far end, then the far end of the line is terminated into a resistance equal to surge impedance of the line
asked
Apr 26, 2018
by
anonymous
Description : Transmission efficiency of a transmission line increases with the
Answer :
Transmission efficiency of a transmission line increases with the increase in power factor and voltage
asked
Apr 26, 2018
by
anonymous
Answer :
Reactance relay is preferred for phase fault on short transmission line.
asked
Mar 20, 2018
by
anonymous
Answer :
Impedance relays are used for phase faults on long line.
asked
Mar 20, 2018
by
anonymous
Answer :
When a wave propagates on a transmission line, it suffers reflection several times at sending and other end.
asked
Mar 20, 2018
by
anonymous
Answer :
When a transmission line is energized, the wave that propagates on it is current wave and voltage wave.
asked
Mar 20, 2018
by
anonymous
Description : Write the relation between phase and line current, phase and line voltage for Star connection.
Answer :
Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection
asked
Aug 11, 2018
by
anonymous
Answer :
A differential relay measures the vector difference between two or more similar electrical quantities.
asked
Mar 19, 2018
by
anonymous
Description : In a transformer the resistance between its primary and secondary should be?
Answer :
In a transformer the resistance between its primary and secondary should be infinity.
asked
Mar 19, 2018
by
anonymous