Rc Circuits — Part 1 MCQs with Explanations

-330° is the correct answer to “A positive angle of 30° is equivalent to a negative angle of”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “Apparent power is expressed in watts.”. This question is standard in competitive examination syllabi for Rc Circuits.

8.48 ∠45° is the correct answer to “The complex number 6 + j6 is equivalent to”. This question is standard in competitive examination syllabi for Rc Circuits.

Increases is the correct answer to “When the frequency of the source voltage decreases, the impedance of a parallel RC circuit”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “The capacitor voltage always leads the current by 90°.”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “In the complex plane, the number 14 - j5 is located in the Fourth quadrant”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “Total current in an RC circuit always leads the source voltage.”. This question is standard in competitive examination syllabi for Rc Circuits.

22.94 + j32.76 is the correct answer to “The complex number 40 ∠ 55° is equivalent to”. This question is standard in competitive examination syllabi for Rc Circuits.

84.5 mW is the correct answer to “A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is”. This question is standard in competitive examination syllabi for Rc Circuits.

Cannot be determined without values is the correct answer to “In a series RC circuit, when the frequency and the resistance are halved, the impedance”. This question is standard in competitive examination syllabi for Rc Circuits.

2121 Ω and θ = -19.5° is the correct answer to “A 2 kΩ resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle”. This question is standard in competitive examination syllabi for Rc Circuits.

180° is the correct answer to “What is the angular difference between +j4 and -j4”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “The impedance of a series RC circuit varies directly with frequency.”. This question is standard in competitive examination syllabi for Rc Circuits.

Increases is the correct answer to “When the frequency of the voltage applied to a series RC circuit is decreased, the impedance”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “The circuit phase angle is the angle between the total current and the applied (source) voltage.”. This question is standard in competitive examination syllabi for Rc Circuits.

Z = 150 ∠-90° ohm is the correct answer to “A capacitor with 150 ohm of capacitive reactance is across an ac source. The impedance, expressed in polar form, is”. This question is standard in competitive examination syllabi for Rc Circuits.

4.11 V is the correct answer to “A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 ∠0° mA, what is the source voltage expressed in polar form”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “An imaginary number is one that exists only in the mind of the mathematician.”. This question is standard in competitive examination syllabi for Rc Circuits.

195.2 W is the correct answer to “For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is”. This question is standard in competitive examination syllabi for Rc Circuits.

129 Ω is the correct answer to “A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z”. This question is standard in competitive examination syllabi for Rc Circuits.

First quadrant is the correct answer to “In the complex plane, the number 4 + j3 is located in the”. This question is standard in competitive examination syllabi for Rc Circuits.

Fourth quadrant is the correct answer to “In the complex plane, the number 14 - j5 is located in the”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “The polar form of a complex number consists of a real part and a j part.”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “Complex numbers can be added and subtracted but not multiplied or divided.”. This question is standard in competitive examination syllabi for Rc Circuits.

19.2 V is the correct answer to “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”. This question is standard in competitive examination syllabi for Rc Circuits.

R < XC is the correct answer to “An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:”. This question is standard in competitive examination syllabi for Rc Circuits.

4.6 mA is the correct answer to “A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “The power factor (PF) indicates how much of the apparent power is true power.”. This question is standard in competitive examination syllabi for Rc Circuits.

Z = 47 Ω - j150 Ω is the correct answer to “A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is”. This question is standard in competitive examination syllabi for Rc Circuits.

2.12 mS + j3.14 mS is the correct answer to “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”. This question is standard in competitive examination syllabi for Rc Circuits.

6 kHz is the correct answer to “A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “A complex number represents a phasor quantity.”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “The resistor voltage is always out of phase with the current.”. This question is standard in competitive examination syllabi for Rc Circuits.

Decreases is the correct answer to “When the frequency of the voltage applied to a series RC circuit is increased, the phase angle”. This question is standard in competitive examination syllabi for Rc Circuits.

False is the correct answer to “A filter passes all frequencies.”. This question is standard in competitive examination syllabi for Rc Circuits.

21.63 is the correct answer to “What is the value of the hypotenuse of a right triangle whose sides are 12 and 18”. This question is standard in competitive examination syllabi for Rc Circuits.

True is the correct answer to “Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.”. This question is standard in competitive examination syllabi for Rc Circuits.

4 units right of the origin on the real axis is the correct answer to “Point +4 on the complex plane is”. This question is standard in competitive examination syllabi for Rc Circuits.

37.9 Ω is the correct answer to “A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance”. This question is standard in competitive examination syllabi for Rc Circuits.