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The inductive interference between power and communication line can be minimized by transposition of the power line, transposition of the communication line.

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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.

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Description :

Pure inductive circuit takes power from the A.C. line when?

Answer :

It takes power when voltage decreases and current increases.

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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

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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.

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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

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Description :

How eddy current can be minimized?

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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

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96 views 1 answer
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).

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Description :

What is the difference between a line voltage and low voltage control system?

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Description :

The reactive power transfer over a line mainly depends on

Answer :

The reactive power transfer over a line mainly depends on lVsl- lVRl

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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

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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

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Description :

What is the relationship between power and resistance?

Answer :

P = I2R Where P = power I = Current R = Resistance

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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.

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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.

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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

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Description :

Answer :

In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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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

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Description :

Stability of a transmission line can be increased by

Answer :

Stability of a transmission line can be increased by Shunt capacitor, Series capacitor

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Answer :

Discrimination between main and back up protection is provided by the use of relays which are slow.

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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.

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237 views 1 answer
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.

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454 views 1 answer
Description :

In a purely inductive circuit?

Answer :

In a purely inductive circuit actual power is zero.

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Description :

In a pure inductive circuit?

Answer :

Voltage lagging in inductor

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Description :

Time constant of an inductive circuit?

Answer :

Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

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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.

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Description :

Answer :

A transmission line is protected by distance protection, time graded and current graded overcurrent protection.

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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

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What is the meaning of Electronics and Communication Engineering?

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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. 

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Description :

Answer :

The steady state stability of the power system can be increased by connecting lines in parallel.

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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

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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.

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What are the types of electronic communication?

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What is the definition of electronic communication?

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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

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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

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Answer :

In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

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What is the difference between relay and contactor?

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Relay have smaller ratings. Contactor is a high rating relay.

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ln HRC fuse the time between cut-off and final current zero is called

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ln HRC fuse the time between cut-off and final current zero is called the arcing time

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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 .

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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

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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

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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

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Answer :

Reactance relay is preferred for phase fault on short transmission line.

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Description :

Answer :

Impedance relays are used for phase faults on long line.

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Description :

Answer :

When a wave propagates on a transmission line, it suffers reflection several times at sending and other end.

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Description :

Answer :

When a transmission line is energized, the wave that propagates on it is current wave and voltage wave.

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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

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Answer :

A differential relay measures the vector difference between two or more similar electrical quantities.

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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.

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