Electrical Engineering - RL Circuits

Exercise :: RL Circuits - General Questions

11. 

A 140 resistor is in parallel with an inductor having 60 inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is

A. 5.51
B. 55.15
C. 90
D. 200

Answer: Option B

Explanation:

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12. 

When the frequency of the voltage applied to a series RL circuit is decreased, the impedance

A. decreases
B. increases
C. does not change
D. cannot be determined without values

Answer: Option A

Explanation:

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13. 

In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

A. 6 A
B. 424 mA
C. 4.24 A
D. 42.4 A

Answer: Option C

Explanation:

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14. 

A 47 resistor is in series with an inductive reactance of 120 across an ac source. The impedance, expressed in polar form, is

A. 4768.6°
B. 12068.6°
C. 12931.4°
D. 12968.6°

Answer: Option D

Explanation:

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15. 

When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle

A. increases
B. decreases
C. is not affected
D. cannot be determined

Answer: Option A

Explanation:

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