
Three-Phase System Quiz

Quiz
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Education
•
University
•
Medium
Sridevi J
Used 1+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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?
V∠120⁰
V∠240⁰
V∠-240⁰
V∠-120⁰
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a delta-connected load, the relation between line voltage and the phase voltage is?
line voltage > phase voltage
line voltage = phase voltage
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the load impedance is Z∠Ø, the current (IR) is?
(V/Z)∠-Ø
(V/Z)∠Ø
(V/Z)∠90-Ø
(V/Z)∠-90+Ø
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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.
44.74∠183.4⁰A
45.74∠183.4⁰A
44.74∠-183.4⁰A
45.74∠-183.4⁰A
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the line current I3.
(24.646+j20) A
(-24.646+j20) A
(-24.646-j20) A
(24.646-j20) A
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The voltage between __________ and ___________ is called phase voltage.
line and line
line and reference
neutral point and reference
line and neutral point
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In delta-connected system, the currents IR, IY, IB are equal in magnitude and they are displaced by _____ from one another.
0⁰
60⁰
90⁰
120⁰
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