11. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is ________.
(a) 564
(b) 0.564
(c) 6.76
(d) 55.7
12. To increase the current in a series RL circuit, the frequency ________.
(a) should be increased
(b) should be decreased
(c) should be constant
(d) cannot be determined without values
13. In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is ________.
(a) 18.4 V
(b) 26.0 V
(c) 2 V
(d) 20 V
14. A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is ________.
(a) 5.51 Ω
(b) 55.15 Ω
(c) 90 Ω
(d) 200 Ω
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
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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…