Question

You are given the two waveforms below. v = 70.7 sin(100nt) and i=7.07 sin (120 nt – 30°) The above two equations prove that o Voltage and current are always sinusoidal waveforms o The voltage phase angle is always zero o The voltage and its related current have the same frequency o The two waveforms are from separate circuits

Answer 1

1.) Given, page- voltage Sources also 1 zero. Some- V= 70.7 sin(100114) , 1=7.07 sin (120116-309 a) It said voltage and current are always Sinusoidal wave forms. It is not always true. we have. De value, triangular wave form, etc, as False b) voltage phase is not always times non zero value as phase . False voltage has 50 Hz frequency current has 60Hz frequency. But they Said Voltage and current have Same frequency: False. dx as both voltage and current have different frequencies, these wave forms are from seperate circuits. and c) Here (True.)

Question 5: elements page-2 (30-325)ms *"s" is inverse of 'Z". s means "Semens". * If we have "j" then it is not resistance a.) Reactance means, Energy storage resistance. For, Inductor jx, on Capace for --> -jxca * It's unit is "s" False ss Admittance is inverse of impedance. * Admitance hoes both resistance and Reactance. Egi (x+jy) s True c) Resistance does not contain 's". False

page 3 (d) Impedance contains resistance and Reactance. Eg (x+jy) * It's unit is si Not "S". False Next Question; b * As capaci for is present, reactance must be Negative so, options "ã and I" are eliminated. present in parallel, add them, if they are admittances. we can * As they are So, option, ses C.) 30-joms ✓

Next Question: page-4 20V احياد 210 1 As it is 210° for half cycle, * It has to be 30°. Because 180° is completed 210.180=30° It is Lagging by Ø It is leading by Ø * Our sine wave is Lagging. For Lagging, sine wave is, sin (wt-o). 1 = 20 sinlwt -30°) option a.) ✓