Explore topic-wise MCQs in Network Theory.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.

1.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the power in the B phase.

A. 0
B. 1
C. 3
D. 2
Answer» B. 1
2.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the power in the Y phase.

A. 1000
B. 2000
C. 3000
D. 4000
Answer» C. 3000
3.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the power in the R phase.

A. 6628
B. 6728
C. 6828
D. 6928
Answer» E.
4.

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.

A. (24.646+j20) A
B. (-24.646+j20) A
C. (-24.646-j20) A
D. (24.646-j20) A
Answer» D. (24.646-j20) A
5.

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 I2.

A. (-27.32+j10) A
B. (27.32+j10) A
C. (-27.32-j10) A
D. (27.32-j10) A
Answer» B. (27.32+j10) A
6.

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 I1.

A. (-51.96-j10) A
B. (-51.96+j10) A
C. (51.96+j10) A
D. (51.96+j10) A
Answer» D. (51.96+j10) A
7.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the phase current IB.

A. (34.64-j20) A
B. (34.64+j20) A
C. (-34.64+j20) A
D. (-34.64-j20) A
Answer» E.
8.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the phase current IY.

A. (10-j0) A
B. (10+j0) A
C. (-10+j0) A
D. (-10-j0) A
Answer» D. (-10-j0) A
9.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Determine the phase current IR.

A. (17.32-j10) A
B. (-17.32-j10) A
C. (17.32+j10) A
D. (-17.32+j10) A
Answer» B. (-17.32-j10) A
10.

IN_THE_QUESTION_2_FIND_THE_POWER_IN_THE_Y_PHASE.?$

A. 1000
B. 2000
C. 3000
D. 4000
Answer» C. 3000
11.

In_the_question_2_find_the_power_in_the_B_phase.$

A. 0
B. 1
C. 3
D. 2
Answer» B. 1
12.

In the question 2 find the power in the R phase?

A. 6628
B. 6728
C. 6828
D. 6928
Answer» E.
13.

From the question 2, find the line current I1.

A. (-51.96-j10) A
B. (-51.96+j10) A
C. (51.96+j10) A
D. (51.96+j10) A
Answer» D. (51.96+j10) A
14.

Find the phase current IY from the question 2.

A. (10-j0) A
B. (10+j0) A
C. (-10+j0) A
D. (-10-j0) A
Answer» D. (-10-j0) A
15.

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Determine the phase current IR.$

A. (17.32-j10) A
B. (-17.32-j10) A
C. (17.32+j10) A
D. (-17.32+j10) A
Answer» B. (-17.32-j10) A
16.

If the system is a three-wire system, the currents flowing towards the load in the three lines must add to ___ at any given instant.

A. 1
B. 2
C. 3
D. zero
Answer» E.