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 Skin effect Capacitive effect between adjacent coil turns Iron loss in core Increase in temperature Skin effect Capacitive effect between adjacent coil turns Iron loss in core 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 maximum value of current at resonance Will change the resonance frequency Will increase the selectivity of the circuit Will change the impedance at resonance frequency Will change the maximum value of current at resonance Will change the resonance frequency Will increase the selectivity of the circuit Will change the impedance at resonance frequency ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The phosphors for which of the following pair are 180° out of phase for VL, VC and VR? None of the listed here VL and VR VC and VL VC and VR None of the listed here VL and VR VC and VL VC and VR ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The voltage of domestic supply is 220 V. This figure represents Average value R.m.s. value Peak value Mean value Average value R.m.s. value Peak value Mean value ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The time constant of a series R-C circuit is given by RC2 R/C RC R2C RC2 R/C RC R2C ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The power factor of a D.C. circuit is always Greater than unity Less than unity Zero Unity Greater than unity Less than unity Zero Unity ANSWER DOWNLOAD EXAMIANS APP
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