Question 1

The reactance of a 500- $\mu$ F capacitor connected to a 45 VAC signal (rms) that oscillates at $\omega = 500$ rad/s is

Accepted Answer

A)  1 $\Omega$ 
B)  2 $\Omega$ 
C)  3 $\Omega$ 
D)  4 $\Omega$ 
A)  1 $\Omega$ 
B)  2 $\Omega$ 
C)  3 $\Omega$ 
D)  4 $\Omega$

Question 2

Consider an RL circuit connected to a 20-VAC source that oscillates at 780 rad/s. The maximum voltage across the inductor is 18 V, and the maximum voltage across the resistor is 12 V. The phase angle (between the circuit impedance and the resistance) is

Accepted Answer

A)  34º. 
B)  82º. 
C)  22º. 
D)  56º. 
A)  34º. 
B)  82º. 
C)  22º. 
D)  56º.

Question 3

The term in an RLC circuit that has the units of time (seconds) is

Accepted Answer

A)  L/R. 
B)  RC. 
C)  R/L. 
D)  L/C. 
A)  L/R. 
B)  RC. 
C)  R/L. 
D)  L/C.

Question 4

To obtain the RMS (root-mean-square) voltage, we multiply the maximum voltage by

Accepted Answer

A)  $\sqrt { 2 }$ 
B)  2. 
C)  1/2. 
D)  1/ $\sqrt { 2 }$ 
A)  $\sqrt { 2 }$ 
B)  2. 
C)  1/2. 
D)  1/ $\sqrt { 2 }$

Question 5

In an ideal inductor

Accepted Answer

A)  the current leads the voltage by $\pi / 2$ 
B)  the current lags the voltage by $\pi$ 
C)  the current leads the voltage by $\pi$ 
D)  the current lags the voltage by $\pi / 2$ 
A)  the current leads the voltage by $\pi / 2$ 
B)  the current lags the voltage by $\pi$ 
C)  the current leads the voltage by $\pi$ 
D)  the current lags the voltage by $\pi / 2$

Question 6

Consider an RLC circuit connected to a 20-VAC source that oscillates at 780 rad/s. The maximum voltage across the inductor is 18 V, the maximum voltage across the capacitor is 6 V, and the maximum voltage across the resistor is 12 V. The phase angle (between the circuit impedance and the resistance) is

Accepted Answer

A)  45º. 
B)  90º. 
C)  0º. 
D)  135º. 
A)  45º. 
B)  90º. 
C)  0º. 
D)  135º.

Question 7

The reactance of a 50-mH inductor connected to a 45-VAC signal (rms) that oscillates at $\omega = 500$ rad/s is

Accepted Answer

A)  0.04 $\Omega$ 
B)  25 $\Omega$ 
C)  12 $\Omega$ 
D)  7.5 $\Omega$ 
A)  0.04 $\Omega$ 
B)  25 $\Omega$ 
C)  12 $\Omega$ 
D)  7.5 $\Omega$

Question 8

A large quality factor ("Q") for an RLC circuit means that

Accepted Answer

A)  its components have very precise values. 
B)  its resonant curve has a steep slope. 
C)  it is well shielded from stray electromagnetic fields. 
D)  its components are very durable. 
A)  its components have very precise values. 
B)  its resonant curve has a steep slope. 
C)  it is well shielded from stray electromagnetic fields. 
D)  its components are very durable.

Question 9

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

Accepted Answer

A)  interpret P as average power. 
B)  interpret I as rms current. 
C)  The first two answers are valid and sufficient. 
D)  Both of the first two answers are necessary, but they are not sufficient. 
A)  interpret P as average power. 
B)  interpret I as rms current. 
C)  The first two answers are valid and sufficient. 
D)  Both of the first two answers are necessary, but they are not sufficient.

Question 10

In an ideal transformer, the physical quantity that is conserved from the input to the output is

Accepted Answer

A)  voltage. 
B)  power. 
C)  current. 
D)  resistance. 
A)  voltage. 
B)  power. 
C)  current. 
D)  resistance.

Exam 32: Alternating Current Circuits

The reactance of a 500- μ\muμ F capacitor connected to a 45 VAC signal (rms) that oscillates at ω=500\omega = 500ω=500 rad/s is

Consider an RL circuit connected to a 20-VAC source that oscillates at 780 rad/s. The maximum voltage across the inductor is 18 V, and the maximum voltage across the resistor is 12 V. The phase angle (between the circuit impedance and the resistance) is

The term in an RLC circuit that has the units of time (seconds) is

To obtain the RMS (root-mean-square) voltage, we multiply the maximum voltage by

In an ideal inductor

The reactance of a 50-mH inductor connected to a 45-VAC signal (rms) that oscillates at ω=500\omega = 500ω=500 rad/s is

A large quality factor ("Q") for an RLC circuit means that

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

In an ideal transformer, the physical quantity that is conserved from the input to the output is

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The reactance of a 500- $\mu$ F capacitor connected to a 45 VAC signal (rms) that oscillates at $\omega = 500$ rad/s is

The reactance of a 50-mH inductor connected to a 45-VAC signal (rms) that oscillates at $\omega = 500$ rad/s is

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