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 increase the selectivity of the circuit Will change the maximum value of current at resonance Will change the impedance at resonance frequency Will change the resonance frequency Will increase the selectivity of the circuit Will change the maximum value of current at resonance Will change the impedance at resonance frequency ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The r.m.s. value of pure cosine function is 0.5 of peak value 0.707 of peak value Same as peak value Zero 0.5 of peak value 0.707 of peak value Same as peak value Zero ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If frequency is increased to 100 Hz, reactance becomes __________ ohms. 10 25 5 15 10 25 5 15 ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The inductance of a coil can be increased by Decreasing the diameter of the former Increasing core length Choosing core material having high relative permeability Decreasing the number of turns Decreasing the diameter of the former Increasing core length Choosing core material having high relative permeability Decreasing the number of turns ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The power factor of a D.C. circuit is always Greater than unity Unity Zero Less than unity Greater than unity Unity Zero Less than unity ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory A phasor is A line which represents the magnitude and phase of an alternating quantity A colored tag or band for distinction between different phases of a 3-phase supply A line representing the magnitude and direction of an alternating quantity An instrument used for measuring phases of an unbalanced 3-phase load A line which represents the magnitude and phase of an alternating quantity A colored tag or band for distinction between different phases of a 3-phase supply A line representing the magnitude and direction of an alternating quantity An instrument used for measuring phases of an unbalanced 3-phase load ANSWER DOWNLOAD EXAMIANS APP
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