# Electrical Engineering - RL Circuits

### Exercise :: RL Circuits - General Questions

6.

A 1.2 k resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

 A. 152.6 B. 1,526 C. 1,200 D. 942

Answer: Option B

Explanation:

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7.

When the frequency is decreased, the impedance of a parallel RL circuit

 A. increases B. decreases C. remains constant D. is not a factor

Answer: Option B

Explanation:

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8.

A 470 resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is

 A. 12.60 –76° mS B. 12.1876° mS C. 218 –76° mS D. 12.18 –76° mS

Answer: Option D

Explanation:

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9.

Referring to Problem 23, the reactive power is

 A. 10 mVAR B. 100 mVAR C. 6.76 mVAR D. 148 mVAR

Answer: Option B

Explanation:

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10.

A 12 k resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.30° mA. The source voltage, expressed in polar form, is

 A. 3.8420.6° V B. 12.820.6° V C. 0.320.6° V D. 13.8469.4° V

Answer: Option A

Explanation:

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