# Recent questions tagged line

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Is the power line voltage available in our homes a dc or an ac voltage?

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Define load and line regulation.

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Write the relation between phase and line current, phase and line voltage for Star connection.

0 answers 50 views

What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.

1 answer 123 views

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

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The command line interpreter that enables the users to interact with operating system is called the A) Window B) Shell C) Process D) Kernel

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Stability of a transmission line can be increased by

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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.

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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.

1 answer 115 views

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

1 answer 24 views

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

1 answer 95 views

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

1 answer 22 views

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

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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

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A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

1 answer 30 views

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then  (A) zero sequence currents are present on both sides of the transformer  (B) zero sequence currents are absent on both sides of the transformer  (C) zero sequence currents are present on the secondary side but not on the primary side  (D) zero sequence currents are present on the primary side but not on the secondary side

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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

1 answer 27 views

Series capacitive compensation in EHV transmission line is used to

1 answer 38 views

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

1 answer 16 views

The line current in a balanced delta system is 30 A. The load current is (A) 30√3 A (B) 30/√3 A (C) 10 A (D) 30/√2 A

1 answer 13 views

The ALE line of an 8085 microprocessor is used to (A) latch the output of an I/O instruction into an external latch. (B) deactivate the chip-select signal from memory devices. (C) find the interrupt enable states of the TRAP interrupt. (D) latch the 8 bits of address lines AD7-AD0 into an external latch.

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

1 answer 54 views

The reactive power transfer over a line mainly depends on

1 answer 24 views

The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for

1 answer 25 views

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

1 answer 24 views

Transmission efficiency of a transmission line increases with the

2 answers 38 views

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

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Explain single line diagram.

2 answers 21 views

What is a high tension power line?

0 answers 15 views

What are the losses in a transmission line?

1 answer 31 views

What is the difference between line and phase current?

1 answer 49 views

What is the difference between line and phase voltage?

0 answers 63 views

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

4 answers 173 views

What is the voltage in 3 phase line?

2 answers 46 views

Asymmetric Digital Subscriber Line (ADSL)

1 answer 45 views

what is mean by medium transmission line ?

1 answer 42 views

what is mean by short transmission line ?

1 answer 42 views

what is mean by long transmission line ?

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