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

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2 answers 50 views

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

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
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asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 446 views

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

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

What is the difference between line and phase current?

asked Mar 10, 2018 in High voltage engineering by Quiz
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Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 58 views
1 answer 29 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

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 79 views

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
0 answers 38 views

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
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

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 25 views

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

asked Jun 29 by Shimroz123
1 answer 14 views

Three identical resistors connected in star consume 5000 W. If the resistors are connected in delta across the same supply, the power consumed will be

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 487 views

Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

asked Feb 14, 2018 in Unit 6 by Quiz
1 answer 19 views

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

asked Apr 29, 2018 in Switchgear And Protection by Shimroz123
1 answer 14 views

In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 86 views

Explain Three Phase Bidirectional Delta Connected Controller.

asked Mar 7, 2018 in Unit 6 by Quiz
1 answer 26 views

Why the read of 3 phase voltage is 440?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 26 views

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

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
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

asked Apr 28, 2018 in Network Analysis by Shimroz123
1 answer 283 views

The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 44 views

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 52 views

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 23 views

The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 39 views

Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

asked Apr 30, 2018 in Control System by Shimroz123
1 answer 23 views

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
3 answers 269 views
0 answers 65 views

Write short notes on 3 phase AC system.

asked Aug 11, 2018 in Electrical Engineering by Shimroz
1 answer 36 views

write short notes on single phase system.

asked Dec 12, 2017 in Electrical Engineering by Quiz
1 answer 14 views

If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 19 views

Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

asked May 8, 2018 in Electrical Engineering by Zeeshan
1 answer 36 views

In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

asked Apr 28, 2018 in High voltage engineering by Shimroz123
1 answer 154 views

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

asked Apr 27, 2018 in Switchgear And Protection by Shimroz123
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

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 79 views
1 answer 54 views

The product of apparent power and cosine of the phase angle between circuit voltage and current is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 75 views

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
1 answer 36 views

State any four applications of three phase circuits.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 35 views

Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
2 answers 63 views

State any four advantages of three phase over single phase.

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 122 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 

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
2 answers 21 views

What is a high tension power line?

asked Mar 10, 2018 in Extra high voltage transmission by Quiz
1 answer 43 views

what is mean by medium transmission line ?

asked Aug 18, 2017 in Electrical Engineering by Zeeshan

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