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?
Select an option to see the answer and solution.
Electrical Engineering · all questionsRC Circuits
RC Circuits
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
42
Questions
2/3
Page
Pick an option on a question to see the right answer and solution.
In the complex plane, the number 4 + j3 is located in the
Select an option to see the answer and solution.
In the complex plane, the number 14 - j5 is located in the
Select an option to see the answer and solution.
The polar form of a complex number consists of a real part and a j part.
Select an option to see the answer and solution.
Complex numbers can be added and subtracted but not multiplied or divided.
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
The power factor (PF) indicates how much of the apparent power is true power.
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
Select an option to see the answer and solution.
A complex number represents a phasor quantity.
Select an option to see the answer and solution.
The resistor voltage is always out of phase with the current.
Select an option to see the answer and solution.
When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
Select an option to see the answer and solution.
A filter passes all frequencies.
Select an option to see the answer and solution.
What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
Select an option to see the answer and solution.
Positive numbers can be represented by points to the right of the origin on the horizontal axis of a graph.
Select an option to see the answer and solution.
Point +4 on the complex plane is
Select an option to see the answer and solution.
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?
Select an option to see the answer and solution.