6. 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
7. 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
8. If a load is purely inductive and the reactive power is 12 VAR, the apparent power is ________.
(a) 0 VA
(b) 12 VA
(c) 6 VA
(d) 24 VA
9. A 12 kΩ 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 = 0.3 ∠0° mA. The source voltage, expressed in polar form, is ________.
(a) 3.84 ∠20.6° V
(b) 12.8 ∠20.6° V
(c) 0.3 ∠20.6° V
(d) 13.84 ∠69.4° V
10. A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is ________.
(a) 47 ∠68.6° Ω
(b) 120 ∠68.6° Ω
(c) 129 ∠31.4° Ω
(d) 129 ∠68.6° Ω
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5555555555 9. A 12 kΩ 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 = 0.3 ∠0° mA. The source voltage, expressed in polar form, is ________. (a) 3.84 ∠20.6° V (b) 12.8 ∠20.6° V (c) 0.3 ∠20.6° V (d) 13.84 ∠69.4° V- 5555555555 15. 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
- 5555555555 17. A 470 Ω resistor and a coil with 125 Ω 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
- 5555555555 10. A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is ________. (a) 47 ∠68.6° Ω (b) 120 ∠68.6° Ω (c) 129 ∠31.4° Ω (d) 129 ∠68.6° Ω
- RC Circuits » Exercise - 1 1. A 470 Ω resistor and a 0.2 μF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is ________. (a) 212 Ω (b) 2.12 mS + j3.14 mS (c) 3.14 mS + j2.12 mS (d) 318.3 Ω 2. In the complex plane, the number 14 – j5 is located in the ________. (a) first quadrant (b) second quadrant (c) third quadrant (d) fourth quadrant 3. Point +4 on the complex plane is ________. (a) 4 units above the origin on the j axis (b) 4 units below the origin on the j axis (c) 4 units right of the origin on the real axis (d) 4 units left of the origin on the real axis 4. A positive angle of 30° is equivalent to a negative angle of ________. (a) –30° (b) –330° (c) –60° (d) –180° 5. In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is ________. (a) 3 V (b) 27 V (c) 19.2 V (d) 1.9 V 6. What is the value of the hypotenuse of a right triangle whose…