RC Circuits

Q1: As frequency increases

A
both series and parallel RC impedance decrease

B
series RC impedance decreases and parallel RC impedance increases

C
series RC impedance increases and parallel RC impedance decreases

D
both series and parallel RC impedance increase

Q2: Calculate the phase angle in the given circuit.

A

B
90°

C
22.52°

D
67.48°

Q3: What is the phase angle in the given circuit?

A
14.95°

B
36.88°

C

D
90°

Q4: What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 komega.gif resistor in parallel?

A
55.3°

B
–55.3°

C
34.8°

D
–34.8°

Q5: Calculate the magnitude of the impedance in the given circuit.

A
24.1 Momega.gif

B
10 Momega.gif

C
26.1 Momega.gif

D
0 omega.gif

Q6: What is the current through XC1 in the given circuit?

A
32.2 mA

B
16 mA

C
12 mA

D
48 mA

Q7: What is the total current in the given circuit?

A
0.28 A

B
0.399 A

C
909 A

D
0.2 A

Q8: Power that is measured in volt-amperes is called

A impedance power

B reactive power

C true power

D apparent power

Q9: Which of the following is the reference vector for parallel RC circuits?

A
R

B
V

C
I

D
XC

Q10: If the frequency increases in the given circuit, how would the total current change?

A The total current would increase.

B The total current would decrease.

C The total current would remain the same.

D More information is needed in order to predict how the total current would change.

Q11: What is the phase angle in the given circuit?

A
14.95°

B
36.88°

C

D
90°

Q12: In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is

A
45 Vac

B
50 Vac

C
60 Vac

D
65 Vac

Q13: Which statement about a series RC circuit is true?

A The capacitor's voltage drop is in phase with the resistor's voltage drop.

B The current leads the source voltage.

C The current lags the source voltage.

D The resistor voltage lags the current.

Q14: What is the effect of increasing the resistance in a series RC circuit?

A There will be no effect at all.

B The current will increase.

C The phase shift will decrease.

D The input voltage will increase.

Q15: Which circuit is represented by the frequency response curve in the given figure?

A High-pass filter

B Low-pass filter

C Band-pass filter

D Band-stop filter

Q16: What is the voltage drop across R1 in the given circuit?

A
10 V

B
4.80 V

C
4.00 V

D
5.80 V

Q17: Power that is measured in volt-amperes is called

A impedance power

B reactive power

C true power

D apparent power

Q18: As frequency increases

A
both series and parallel RC impedance decrease

B
series RC impedance decreases and parallel RC impedance increases

C
series RC impedance increases and parallel RC impedance decreases

D
both series and parallel RC impedance increase

Q19: Calculate the magnitude of the impedance in the given circuit.

A
24.1 Momega.gif

B
10 Momega.gif

C
26.1 Momega.gif

D
0 omega.gif

Q20: Calculate the phase angle in the given circuit.

A

B
90°

C
22.52°

D
67.48°

Q21: Which circuit is represented by the frequency response curve in the given figure?

A High-pass filter

B Low-pass filter

C Band-pass filter

D Band-stop filter

Q22: What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 komega.gif resistor in parallel?

A
55.3°

B
–55.3°

C
34.8°

D
–34.8°


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