Chapter 2: 23MCQ (page 72)
In a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero.
(a) True
(b) False
Answer
Therefore, the correct option for the statement is “True”.
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For the circuit shown in Figure 2.24, compute the voltage across the load terminals.
(a) Transformto phasor form. Comment on whether appears in your answer. (b) Transform to instantaneous form. Assume that (c) Add the two sinusoidal functions a(t) and b(t)andof the same frequency given as follows: a(t) = Aand b(t) = B. Use phasor methods and obtain the resultant c(t) . Does the resultant have the same frequency?
With sinusoidal-steady-state excitation, the average power in a singlephase ac circuit with a purely resistive load is given by
(a)
(b)
(c) Zero
Let a series network be connected to a source voltage , drawing a current
(a) In terms of the load impedance . Find expressions for and,
(b) Express in terms of and , by choosing.
(c) For the case of , interpret the result of part (b) in terms of. In particular, if, when the inductive and capacitive reactance cancel, comment on What happens.
The power factor for an inductive circuit (R-L load), in which the current lags the voltage, is said to be
(a) Lagging
(b) Leading
(c) Zero
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