Test: Balanced Three Phase Circuits

# Test: Balanced Three Phase Circuits

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## 10 Questions MCQ Test GATE Electrical Engineering (EE) 2023 Mock Test Series | Test: Balanced Three Phase Circuits

Test: Balanced Three Phase Circuits for Electrical Engineering (EE) 2023 is part of GATE Electrical Engineering (EE) 2023 Mock Test Series 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) 2023 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

Determine the power (kW) drawn by the load.

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

Power is defined as the product of voltage and current. So the power drawn by the load is P = 3VPhIPhcosØ = 24kW.

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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