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Exam 32: Alternating Current Circuits

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Question 21

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As the impedance in a simple series AC circuit gets larger, all of the following statements are valid except

A) for a given AC current, the AC voltage increases.
B) for a given AC power, the AC current decreases.
C) for a given AC voltage, the AC current decreases.
D) for a given AC voltage, the AC power increases.

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Question 22

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Consider an ideal inductor L connected directly to an AC voltage source V, with I being the current in the loop. Summing voltage drops around the loop yields

A) $d I / d t = V / L$
B) $d V / d t = I / L$
C) $d V / d t = L / I$
D) $d I / d t = L / V$

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Question 23

Multiple Choice

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RMS voltage is related to peak voltage by the equation

The maximum (instantaneous) emf across a capacitor is 160 V and the reactance of the capacitor is 12 $\Omega$ . The maximum current through the capacitor is

A possible clue to question 35 is that the electrical element that exhibits "inertia to the change of the current" is the

An RLC circuit has a 12- $\Omega$ resistor connected to an inductor with 44 $\Omega$ reactance and a capacitor with 21 $\Omega$ reactance. The effective resistance as seen by the source (impedance) is

The resonant frequency of a 1-H inductor and 1-F capacitor (forming an LC circuit) is

A transformer has 90 turns on the primary coil and 175 turns on the secondary coil. If the AC input current is 5 A, the output current is

A charged 200- $\mu$ F capacitor is connected to a 100-mH inductor to form an LC oscillator. The voltage across the inductor oscillates at

The power factor for an RLC circuit is

In an ideal transformer, the output

The quality factor, Q, of an ideal LC circuit oscillating at $\omega _ { 0 } = 100$ rad/s with an inductor (L) of 120 mH is

In a simple series AC circuit, an explanation for the phase relationship between current and voltage for a capacitor is that the voltage across a capacitor is proportional to

A transformer has 90 turns on the primary coil and 175 turns on the secondary coil. If the input voltage is 120 VAC, the output voltage is

The rms emf across an inductor is 5.2 V, and the reactance of the inductor is 0.77 $\Omega$ . The current (rms) through the inductor is

At high frequencies, the reactances of an inductor and capacitor are

A 45-VAC signal (rms) is present across a 5- $\Omega$ resistor. The time-averaged power dissipated in the resistor is

The instantaneous power loss in a circuit containing a resistor and an inductor through which DC current flows is given by the formula P = I² Z. To retain the form of this equation for the case of AC current, it is enough to

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In a simple series RC circuit with a sinusoidal driving voltage, the phase relationship for a capacitor is that the