AC Fundamentals, Circuit and Circuit Theory The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of Increase in temperature Capacitive effect between adjacent coil turns Iron loss in core Skin effect Increase in temperature Capacitive effect between adjacent coil turns Iron loss in core Skin effect ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The square waveform of current has following relation between r.m.s. value and average value. r.m.s. value of current is greater than average value None of these r.m.s. value of current is less than average value r.m.s. value is equal to average value r.m.s. value of current is greater than average value None of these r.m.s. value of current is less than average value r.m.s. value is equal to average value ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory Inductance of coil Increases with the increase in supply frequency Is unaffected by the supply frequency Decreases with the increase in supply frequency Becomes zero with the increase in supply frequency Increases with the increase in supply frequency Is unaffected by the supply frequency Decreases with the increase in supply frequency Becomes zero with the increase in supply frequency ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that Both waves must have identical peak values None of the listed here Both waves must have zero value at the same time Both waves must have same frequency Both waves must have identical peak values None of the listed here Both waves must have zero value at the same time Both waves must have same frequency ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The product of apparent power and cosine of the phase angle between circuit voltage and current is Volt-amperes Reactive power Instantaneous power True power Volt-amperes Reactive power Instantaneous power True power 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 impedance at resonance frequency Will change the maximum value of current at resonance Will increase the selectivity of the circuit Will change the resonance frequency Will change the impedance at resonance frequency Will change the maximum value of current at resonance Will increase the selectivity of the circuit Will change the resonance frequency ANSWER DOWNLOAD EXAMIANS APP
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