Balanced Circuits MCQs : This section focuses on the "Balanced Circuits". These Multiple Choice Questions (MCQs) should be practiced to improve the Balanced Circuits skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current IB.
A. 44.74∠303.4⁰A
B. 44.74∠-303.4⁰A
C. 45.74∠303.4⁰A
D. 45.74∠-303.4⁰A
Question 2
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.
A. 44.74∠-63.4⁰A
B. 44.74∠63.4⁰A
C. 45.74∠-63.4⁰A
D. 45.74∠63.4⁰A
Question 3
A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current IY.
A. 44.74∠183.4⁰A
B. 45.74∠183.4⁰A
C. 44.74∠183.4⁰A
D. 45.74∠-183.4⁰A
Question 4
Determine the power (kW) drawn by the load.
A. 21
B. 22
C. 23
D. 24
Question 5
If the load impedance is Z∠Ø, the current (IR) is?
A. (V/Z)∠-Ø
B. (V/Z)∠Ø
C. (V/Z)∠90-Ø
D. (V/Z)∠-90+Ø
Question 6
If the load impedance is Z∠Ø, the expression obtained for current (IB) is?
A. (V/Z)∠-240+Ø
B. (V/Z)∠-240-Ø
C. (V/Z)∠240-Ø
D. (V/Z)∠240+Ø
Question 7
If the load impedance is Z∠Ø, the expression obtained for current (IY) is?
A. (V/Z)∠-120+Ø
B. (V/Z)∠120-Ø
C. (V/Z)∠120+Ø
D. (V/Z)∠-120-Ø
Question 8
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?
A. V∠120⁰
B. V∠240⁰
C. V∠-240⁰
D. V∠-120⁰
Question 9
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?
A. V∠0⁰
B. V∠-120⁰
C. V∠120⁰
D. V∠240⁰
Question 10
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