RL Circuits » Exercise – 1

1. When the frequency of the voltage applied to a series RL circuit is increased, the phase angle ________.

(a) decreases

(b) increases

(c) does not change

(d) cannot be determined without values

2. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance ________.

(a) decreases

(b) increases

(c) does not change

(d) cannot be determined without values

3. If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit ________.

(a) doubles

(b) halves

(c) remains constant

(d) cannot be determined without values

4. When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle ________.

(a) increases

(b) decreases

(c) is not affected

(d) cannot be determined

5. When the frequency is decreased, the impedance of a parallel RL circuit ________.

(a) increases

(b) decreases

(c) remains constant

(d) is not a factor

## Related Posts

- 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…