Electrical Engineering - RC Circuits

Exercise :: RC Circuits - General Questions

21. 

A 12 k resistor is in series with a 0.02 F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.30° mA, what is the source voltage expressed in polar form?

A. 45.6 V
B. 411.3 V
C. 0.411 V
D. 4.11 V

Answer: Option D

Explanation:

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22. 

The complex number 40 55° is equivalent to

A. 55 + j55
B. 40 + j40
C. 45.88 + j65.52
D. 22.94 + j32.76

Answer: Option D

Explanation:

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23. 

A 120 resistor is in parallel with a capacitor with a capacitive reactance of 40 . Both components are across a 12 V ac source. What is the magnitude of the total impedance?

A. 37.9
B. 3.7
C. 14,400
D. 4,800

Answer: Option A

Explanation:

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24. 

A 47 resistor and a capacitor with 150 of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is

A. Z = 47 + j150
B. Z = 47 j150
C. Z = 197
D. Z = 103

Answer: Option B

Explanation:

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25. 

A 2 k resistor and a 0.002 F capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

A. 84.5 mW
B. 845 mW
C. 13 mW
D. 130 mW

Answer: Option A

Explanation:

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