AC Fundamentals, Circuit and Circuit Theory The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes __________ ohms. 15 5 2.5 10 15 5 2.5 10 ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is None of the listed here A sinusoid of double the frequency A sinusoid of the same frequency A sinusoid of half the original frequency None of the listed here A sinusoid of double the frequency A sinusoid of the same frequency A sinusoid of half the original frequency ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory At __________ frequencies the parallel R-L circuit behaves as purely resistive. Low High Very low Very high Low High Very low Very high ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees. 60 45 30 90 60 45 30 90 ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value Will change the resonance frequency Will change the impedance at resonance frequency Will increase the selectivity of the circuit Will change the maximum value of current at resonance Will change the resonance frequency Will change the impedance at resonance frequency Will increase the selectivity of the circuit Will change the maximum value of current at resonance ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters? None of these 220 v3 V 220 V 220/v3 V None of these 220 v3 V 220 V 220/v3 V ANSWER DOWNLOAD EXAMIANS APP
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