# Three-Phase Balanced Circuits MCQ’s

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Three-Phase Balanced Circuits”.

1. In a balanced three-phase system-delta load, if we assume the line voltage is V_{RY} = V∠0⁰ as a reference phasor. Then the source voltage V_{BR} is?

a) V∠120⁰

b) V∠240⁰

c) V∠-240⁰

d) V∠-120⁰

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

a) line voltage > phase voltage

b) line voltage < phase voltage

c) line voltage = phase voltage

d) line voltage >= phase voltage

3. In a balanced three-phase system-delta load, if we assume the line voltage is V_{RY} = V∠0⁰ as a reference phasor. Then the source voltage V_{YB} is?

a) V∠0⁰

b) V∠-120⁰

c) V∠120⁰

d) V∠240⁰

4. If the load impedance is Z∠Ø, the current (I_{R}) is?

a) (V/Z)∠-Ø

b) (V/Z)∠Ø

c) (V/Z)∠90-Ø

d) (V/Z)∠-90+Ø

5. If the load impedance is Z∠Ø, the expression obtained for current (I_{B}) is?

a) (V/Z)∠-240+Ø

b) (V/Z)∠-240-Ø

c) (V/Z)∠240-Ø

d) (V/Z)∠240+Ø

6. A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current I_{Y}.

a) 44.74∠183.4⁰A

b) 45.74∠183.4⁰A

c) 44.74∠183.4⁰A

d) 45.74∠-183.4⁰A

7. If the load impedance is Z∠Ø, the expression obtained for current (I_{Y}) is?

a) (V/Z)∠-120+Ø

b) (V/Z)∠120-Ø

c) (V/Z)∠120+Ø

d) (V/Z)∠-120-Ø

8. A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current I_{R}. Assume the phase sequence to be R_{YB}.

a) 44.74∠-63.4⁰A

b) 44.74∠63.4⁰A

c) 45.74∠-63.4⁰A

d) 45.74∠63.4⁰A

9. A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current I_{B}.

a) 44.74∠303.4⁰A

b) 44.74∠-303.4⁰A

c) 45.74∠303.4⁰A

d) 45.74∠-303.4⁰A

10. Determine the power (kW) drawn by the load.

a) 21

b) 22

c) 23

d) 24

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