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Test: Balanced Three Phase Circuits - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test GATE Electrical Engineering (EE) Mock Test Series 2025 - Test: Balanced Three Phase Circuits

Test: Balanced Three Phase Circuits for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) Mock Test Series 2025 preparation. The Test: Balanced Three Phase Circuits questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Balanced Three Phase Circuits MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Balanced Three Phase Circuits below.
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Test: Balanced Three Phase Circuits - Question 1

In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VYB is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 1

As the line voltage VRY = V∠0⁰ is taken as a reference phasor. Then the source voltage VYB is V∠-120⁰.

Test: Balanced Three Phase Circuits - Question 2

 In a delta-connected load, the relation between line voltage and the phase voltage is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 2

In a delta-connected load, the relation between line voltage and the phase voltage is line voltage = phase voltage.

Test: Balanced Three Phase Circuits - Question 3

If the load impedance is Z∠Ø, the expression obtained for current (IY) is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 3

As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the Y impedance is IY = VYB∠120⁰/Z∠Ø = (V/Z)∠-120-Ø.

Test: Balanced Three Phase Circuits - Question 4

A three-phase balanced delta connected load of (4 + j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current IR. Assume the phase sequence to be RYB.

Detailed Solution for Test: Balanced Three Phase Circuits - Question 4

Taking the line voltage VRY = V∠0⁰ as a reference VRY = 400∠0⁰V, VYB = 400 ∠ -120 ⁰V and VBR = 400∠-240⁰V. Impedance per phase = (4 + j8) Ω = 8.94∠63.4⁰Ω. Phase current IR = (400∠0o)/(8.94∠63.4o )= 44.74 ∠ -63.4⁰A.

Test: Balanced Three Phase Circuits - Question 5

A 415 V, three-phase star-connected alternator supplies a delta-connected load, each phase of which has an impedance of (86∠54.46°) Ω. Calculate kVA rating of the alternator, neglecting losses in the line between the alternator and load.

 

Detailed Solution for Test: Balanced Three Phase Circuits - Question 5

Test: Balanced Three Phase Circuits - Question 6

In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VBR is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 6

As the line voltage VRY = V∠0⁰ is taken as a reference phasor. Then the source voltage VBR is V∠-240⁰.

Test: Balanced Three Phase Circuits - Question 7

If the load impedance is Z∠Ø, the current (IR) is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 7

As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the R impedance is IR = VBR∠0⁰/Z∠Ø = (V/Z)∠-Ø.

Test: Balanced Three Phase Circuits - Question 8

If the load impedance is Z∠Ø, the expression obtained for current (IB) is?

Detailed Solution for Test: Balanced Three Phase Circuits - Question 8

As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the B impedance is IB = VBR∠240⁰/Z∠Ø = (V/Z)∠-240-Ø.

Test: Balanced Three Phase Circuits - Question 9

In wye or star connection _____________ of the three phases are joined together within the alternator.

Detailed Solution for Test: Balanced Three Phase Circuits - Question 9

In wye or star connection, similar ends of the three phases are joined together within the alternator. The common terminal so formed is referred to as the neutral point or neutral terminal.

Test: Balanced Three Phase Circuits - Question 10

The voltage between ______________ is called line voltage.

Detailed Solution for Test: Balanced Three Phase Circuits - Question 10

The voltage between line and line is called line voltage. And the voltage between line and neutral point is called phase voltage. The currents flowing through the phases are called the phase currents, while those flowing in the lines are called the line currents.

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