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Chapter 2: 27MCQ (page 72)

When working with balanced three-phase circuits, per-phase analysis is commonly done after converting∆loads to Y loads, thereby solving only one phase of the circuit.

(a) True

(b) False

Short Answer

Expert verified

Answer

Therefore, the correct option is (a) True.

Step by step solution

01

Significance of star connection.

Consider in the star connection the current at the neutral point is zero. So one can easily carry out the calculation in the star connection as there is a neutral point that is connected to the neutral of the source.

In star connection if the circuit is balanced, the calculation of one of the three phases is sufficient to show calculation for the other phases.

02

Define if statement is true or false.

Since, there is no neutral available in the delta connection, so one can convert the delta connection to star and do the necessary calculation. So per phase analysis is carried out after solving for one of the circuit.

Thus, the statement is true.

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Most popular questions from this chapter

For a purely inductive circuit, with sinusoidal-steady-state excitation, the voltage and current phasors are

(a) In phase

(b) Perpendicular with each other with Vleading role="math" localid="1652441917385" I

c) Perpendicular with each other with IleadingV

A circuit consists of two impedances Z1= 20∠30oΩand Z2= 25∠60oV , in parallel, supply by a source voltage V =100∠60oV . Determine the power triangle for each of the impedances and for the source.

The voltage v (t) =359.3cos (ωt) volts is applied to a load consisting of a 10- resistor in parallel with a capacitive reactance Xc 25Ω . Calculate (a) the instantaneous power absorbed by the resistor, (b) the instantaneous power absorbed by the capacitor, (c) the real power absorbed by the resistor, (d) the reactive power delivered by the capacitor, and (e) the load power factor.

In an ac circuit, power factor improvement is achieved by

(a)Connecting a resistor in parallel with the inductive load.

(b)Connecting an inductor in parallel with the inductive load.

(c)Connecting a capacitor in parallel with the inductive load.

The root mean square (rms) value ofV(t)=Vmaxcos(ωt+δ)is given by

(a) Vmax

(b) Vmax2

(c) 2Vmax

(d) 2Vmax
See all solutions

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