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Network Analysis
Three Phase Circuits

Practice questions from Three Phase Circuits.

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Q#1 Three Phase Circuits GATE EE 2023 (Set 1) NAT +2 marks -0 marks

A balanced delta connected load consisting of the series connection of one resistor (R=15Ω) and a capacitor  in each phase is connected to three-phase,  supply terminals through a line having an inductance of  per phase, as shown in the figure. Considering the change in the supply terminal voltage with loading to be negligible, the magnitude of the voltage across the terminals  in Volts is ________ (Round off to the nearest integer).

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Q#2 Three Phase Circuits GATE EE 2022 (Set 1) MCQ +1 mark -0.33 marks

In the circuit shown below, a three-phase star-connected unbalanced load is connected to a balanced three-phase supply of  with phase sequence ABC. The star connected load has  and . The value of  in , for which the voltage difference across the nodes n and n’ is zero is

20 ∠ -30°

20 ∠ 30°

20∠ -60°        

20 ∠ 60°

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Q#3 Three Phase Circuits GATE EE 2022 (Set 1) NAT +1 mark -0 marks

Two balanced three-phase loads, as shown in the figure, are connected to a 100√3 V, three-phase, 50 Hz main supply. Given  and .

The ammeter reading, in amperes, is _______. (round off to nearest integer)

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Q#4 Three Phase Circuits GATE EE 2021 (Set 1) NAT +2 marks -0 marks

A three-phase balanced voltage is applied to the load shown. The phase sequence is RYB. The ratio  is ________.

A picture containing diagram, line, font

Description automatically generated

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Q#5 Three Phase Circuits GATE EE 2019 (Set 1) MCQ +2 marks -0.66 marks

The line currents of a three-phase four wire system are square waves with amplitude of 100 A. These three currents are phase shifted by 120° with respect to each other. The rms value of neutral current is

0 A

300 A

100 A

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Q#6 Three Phase Circuits GATE EE 2018 (Set 1) NAT +2 marks -0 marks

A three-phase load is connected to a three-phase balanced supply as shown in the figure. If ,  and (angles are considered positive in the anti-clockwise direction), the value of R for zero current in the neutral wire is _______  (up to 2 decimal places).

Untitled-27.png

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Q#7 Three Phase Circuits GATE EE 2017 (Set 2) MCQ +2 marks -0.66 marks

For the balanced Y-Y connected 3-phase circuit shown in the figure below, the line-line voltage is 208 V rms and the total power absorbed by the load is 432 W at a power factor of 0.6 leading.

Z:\PY\EE\Redreaw figure\Network\updated\122-06.jpg 

The approximate value of the impedance Z is

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Q#8 Three Phase Circuits GATE EE 2016 (Set 2) NAT +2 marks -0 marks

In the balanced 3-phase, 50Hz, circuit shown below, the value of inductance (L) is 10mH. The value of the capacitance (C) for which all the line currents are zero, in millifarads, is ____________

15.jpg

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Q#9 Three Phase Circuits GATE EE 2014 (Set 3) MCQ +1 mark -0.33 marks

The line A to neutral voltage is  for a balanced three phase star-connected load with phase sequence ABC. The voltage of line B with respect to line C is given by

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Q#10 Three Phase Circuits GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

For the three-phase circuit shown in Figure, the ratio of the current is given by

Q32.jpg

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Q#11 Three Phase Circuits GATE EE 1994 (Set 1) NAT +1 mark -0 marks

A set of 3 equal resistor, each of value , connected in star across RYB of given figure consumes the same power as the unbalanced delta-connected load shown. The value of is __________Ω

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Q#12 Three Phase Circuits GATE EE 1992 (Set 1) NAT +2 marks -0 marks

Using Thevenin equivalent circuit, determine the rms value of the voltage across the 100 ohm resistor (PQ) after the switch is closed in the 3-phase shown in figure.

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