Voltage, Current and Power in a Delta Connected System MCQ’s

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This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Voltage, Current and Power in a Delta Connected System”.

1. In a delta connected system, the voltage across the terminals R and Y is 400∠0⁰. Find the line voltage VYB.
a) 400∠120⁰
b) 400∠-120⁰
c) 400∠240⁰
d) 400∠-240⁰

2. In a delta connected system, the voltage across the terminals R and Y is 400∠0⁰. Find the line voltage VBR.
a) 400∠240⁰
b) 400∠120⁰
c) 400∠-240⁰
d) 400∠-120⁰

3. In a delta connected system, the voltage across the terminals R and Y is 400∠0⁰. Calculate the line voltage VRY. Assume RRY phase sequence.
a) 400∠0⁰
b) 400∠120⁰
c) 400∠-120⁰
d) 400∠240⁰

4. In delta-connected system, the currents IR, IY, IB are equal in magnitude and they are displaced by _____ from one another.
a) 0⁰
b) 60⁰
c) 90⁰
d) 120⁰

5. The relation between IL and IPh is in a delta connected system is?
a) IL = IPh
b) IL = √3 IPh
c) IL = 3 IPh
d) IL = 3√3IPh

6. In a delta connected system, the expression of power (P) is?
a) VLILcosφ W
b) √3 VLILcosφ W
c) 3VLILcosφ W
d) 3√3VLILcosφ W

7. In a delta-connected system, the currents IR = IB = IY =?
a) IPh
b) 2IPh
c) 3IPh
d) 4IPh

8. The line currents are ________ behind respective phase currents in a delta connected system.
a) 120⁰
b) 90⁰
c) 60⁰
d) 30⁰

9. A balanced delta-connected load of (2+j3) Ω per phase is connected to a balanced three-phase 440V supply. The phase current is 10A. Find the total active power.
a) 7.26W
b) 726W
c) 7260W
d) 72.6W

10. A balanced delta-connected load of (2+j3) Ω per phase is connected to a balanced three-phase 440V supply. The phase current is 10A. Find the apparent power.
a) 10955.67 VAR
b) 10.95567 VAR
c) 109.5567 VAR
d) 1.095567 VAR

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