Exercise: Rl Circuits

Questions for: Rl Circuits

Referring to Problem 23, the reactive power is
A:
10 mVAR
B:
100 mVAR
C:
6.76 mVAR
D:
148 mVAR
Answer: B
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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: D
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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: B
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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: B
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A 470 resistor and a coil with 125 inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
A:
152 mA
B:
32 mA
C:
12 mA
D:
120 mA
Answer: D
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