AC Circuit Final Exam Review questions with 100- correct answers.

T/F: Current exists in an ideal capacitor only when its voltage is changing True T/F: In a series capacitor circuit, the largest value of capacitance will have the smallest amount of voltage dropped across it. True T/F: In a series capacitor circuit, the largest value of capacitance will have the largest share of total charge on its plates False T/F: Magnetic lines of force never cross one another True T/F: Current flowing through a conductor creates a magnetic field that is concentric about the conductor True T/F: The stacking factor for practical iron cores is always greater than unity False T/F: For ferromagnetic materials, μ is always constant False T/F: When a ferromagnetic material is used in an electromagnet, simply turning off the current does not demagnetize the material True T/F: Inductors are sometimes called chokes True T/F: Practical inductors also offer some resistance to current flow True T/F: An ideal inductor appears as a short circuit to a dc source True T/F: The ac current through a resistor has the same waveform as the ac voltage applied to it True T/F: One hertz is equal to 60 cps False T/F: The period of a waveform is equal to 1/f True T/F: Angular velocity is measured in units of cycles per second False T/F: In a purely resistive circuit, current and voltage are in phase True T/F: Power is consumed only by resistive elements of a circuit True T/F: The total impedance of a parallel resonant circuit is maximum at the resonant frequency True T/F: In a series RLC circuit, the smaller the value of resistance, the higher the selectivity True T/F: The equation BW= w/Q applies to both series and parallel resonant circuits True A capacitor consists of two metal plates separated by a(n) ___ material dielectric The value of capacitance is ___ proportional to the area of the plates and ___ proportional to the spacing between the plates directly; inversely The strength of an electric field is determined by the ___ of the lines of force density Because no insulator is perfect, there is always a small amount of ___ current through the dielectric of a charged capacitor leakage Voltage cannot change instantaneously across a capacitor, but ___ can change instantaneously across a capacitor Current In the equation r=RC, r represents the ___ of the circuit expressed in units of ___ Time constant; seconds In 5 time constants, a transient reaches approximately ___% of its final value 100 In the equation Vc=V0e^-t/RC, Vc=___ when t=0 and Vc=___ when t5RC V0; 0 PRR and PRF are abbreviations for ___ and ___ Pulse Repetition Rate; Pulse Repetition Frequency The rise time of a pulse waveform is measured to ___% amplitude, and the fall time to ___% amplitude 90; 10 For a non-ideal square wave, pulse duration is measured at the ___% level 50 The direction of flux external to a bar magnet is from the ___ pole to the ___ pole North; South The SI unit of measure for flux is the ___ Weber In the CGS system, flux is measured in units of ___ and flux density in units of ___ Maxwells; gauss In the English system, flux is measured in units of ___ and flux density in units of ___ Lines; lines/in^2 In an inductor circuit, (voltage, current) ___ can change abruptly, but (voltage, current) ___ always changes gradually Voltage; current