Intro to Electronic Circuits Final
A capacitance of 1200 pF is the same as 1.2 microF.
False
Admittance is the reciprocal of susceptance.
False
If a series RL circuit is connected to a DC source, the maximum current is limited by the total inductance.
False
The impedance of a series RLC circuit is dependent on the source voltage.
False
The power factor is equal to the tangent of the phase angle.
False
The reciprocal of impedance is susceptance.
False
The time constant of an RL circuit is given by the formula t = R/L.
False
The total reactance of series capacitors is the product-over-sum of the individual reactance.
False
Voltage leads current in a capacitor.
False
When two capacitors are in parallel with a voltage source, the smaller capacitor will have the larger voltage.
False
A RLC circuit can have a higher voltage than the source voltage across the resistor.
True
Above the resonant frequency, a series resonant circuit will look inductive and current will lag the voltage.
True
The Q of an inductor is dependent on the frequency at which it is measured.
True
The area of the plates of a capacitor is proportional to the capacitence.
True
The total inductance of parallel inductors is always less than that of the smallest inductor.
True
When a capacitor is charging or discharging between two levels, the charge on the capacitor changes by 63% of the difference in one time constant.
True
A high pass series RL filter has the output taken from across the resistor.
False
A parallel resonant band stop filter has minimum impedance at the resonant frequency.
False
A purely resistive circuit has a power factor of 0.
False
Apparent power is measured in watts.
False
Capacitive reactance is proportional to the applied frequency.
False
In a series RC circuit, the impedance increases when the frequency increases.
False
In a series RC lag circuit, the output voltage is taken across the resistor.
False
In an AC parallel RL circuit, the voltage across the inductor is out of phase with the voltage across the resistor.
False
In an AC series RL circuit, the current and voltage are in phase for the inductor.
False
In an parallel RLC circuit the total impedance is always greater than the resistance.
False
Inductive reactance is directly proportional to the frequency.
False
Inductors in parallel combine like resistors in series
False
Kirchhoffs voltage law does not apply to inductive circuits.
False
Lenz's law states that the amount of voltage induced in a coil is proportional to the rate of change of the magnetic field with respect to the coil.
False
The Q of a band pass filter does not affect the bandwidth.
False
The frequency of the power curve of an inductive circuit is equal to the frequency of the applied voltage.
False
high frequency signals pass more easily through inductors than low frequency signals.
False
it is possible to read peak voltage of an AC source with a multimeter
False
A band pass filter can be constructed from an RLC circuit.
True
A capacitor appears as an open to a constant DC.
True
An ideal inductor has no winding resistance.
True
At resonance the current in a parallel resonant circuit is the same in all components.
True
If Xc = R, the phase shift in a series RC circuit is 45° with current leading voltage.
True
In a AC inductive circuit, the current lags the voltage in the inductor.
True
In a parallel RC circuit, as frequency is increased, the conductance is unchanged.
True
The phase angle of an RC circuit is measured between the source voltage and current.
True
The total inductance of two parallel inductors is equal to the product over sum of the individual inductors.
True
The unit of reactive power is the VAR.
True
The unit siemenes is used to measure both susceptance and admittance.
True
The upper and lower cut off frequencies of a band stop filter determine the bandwidth.
True
When two capacitors are in series with a voltage source, the smaller capacitor will have the larger voltage.
True
in an Ac series RL circuit where 3 volts is dropped across the resistor and 4 volts is dropped across the inductor, it follows that the source voltage is 5 volts
True
if two capacitors are placed in parallel, the total capacitance is
the sum of two cap values
the turn ratio of a transformer is related to the actual number of times the wire is wrapped around the transformer core
true
vp, vpp and vrms are all ways of describing the same voltage signal.
true
In an AC circuit where R = XL, the phase angle is 45°
True
the voltage drop across a capacitor does not change when frequency changes.
False
the voltage drop across an inductor in DC circuit is equal to the source
False
If the power factor of a circuit is .5 the reactive power and true power are equal.
True
In an AC parallel RL circuit, the inductive susceptance is always less than the admittance.
True
The impedance of a parallel RC circuit can be found by applying phasor arithmetic to the product over sum rule.
True
if the input voltage on the primary of a transformer increases, the voltage on the secondary
increases
capacitors allow AC current to pass and block DC current
true
the time necessary to fully charge a capacitor is 5t
true
transformers allow AC voltage to pass while blocking DC voltage
true
