Rl Circuits - Study Mode

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[#6] Which of the following power factors results in less energy loss in an RL circuit?

(A) 1

(B) 0.8

(C) 0.4

(D) 0.2

Correct Answer

(D) 0.2

[#7] A 470 Ω 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) 12.18 ∠76° mS

(C) 218 ∠-76° mS

(D) 12.18 ∠-76° mS

Correct Answer

(D) 12.18 ∠-76° mS

[#8] 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

Correct Answer

(C) 4.24 A

[#9] A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.

(A) True

(B) False

Correct Answer

(B) False

[#10] A 1.2 kΩ 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 Ω

(B) 1,526 Ω

(C) 1,200 Ω

(D) 942 Ω

Correct Answer

(B) 1,526 Ω