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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