Electrical Impedance -Multiple Choice Questions Quiz

Interactive MCQs on “Electrical Impedance”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1: What is electrical impedance?

(a) The opposition to the flow of electric current in a circuit
(b) The ability of a material to conduct electricity
(c) The voltage drop across a resistor in a circuit
(d) The power consumed by an electrical device

Question 2: What is the SI unit of electrical impedance?

(a) Ohm (Ω)
(b) Volt (V)
(c) Ampere (A)
(d) Watt (W)

Question 3: What is the mathematical representation of electrical impedance in a circuit?

(a) Z = V/I
(b) Z = R + jX
(c) Z = P/Q
(d) Z = √(R^2 + X^2)

Question 4: What is the relationship between electrical impedance and resistance in a purely resistive circuit?

(a) Impedance is equal to resistance (Z = R).
(b) Impedance is greater than resistance (Z > R).
(c) Impedance is less than resistance (Z < R).
(d) There is no relationship between impedance and resistance.

Question 5: In a purely inductive circuit, what is the phase relationship between voltage and current?

(a) Voltage leads current by 90 degrees.
(b) Voltage lags current by 90 degrees.
(c) Voltage and current are in phase.
(d) There is no phase difference between voltage and current.

Question 6: What is the reactance in a purely capacitive circuit?

(a) Inductive reactance (XL)
(b) Capacitive reactance (XC)
(c) Zero reactance
(d) Pure resistance

Question 7: What is the net reactance in a circuit that consists of both inductive and capacitive elements?

(a) It depends on the resistance.
(b) The reactances cancel each other out (net reactance is zero).
(c) The reactances add up algebraically.
(d) The reactances combine in parallel.

Question 8: What is the phase relationship between voltage and current in a purely resistive circuit?

(a) Voltage leads current by 90 degrees.
(b) Voltage lags current by 90 degrees.
(c) Voltage and current are in phase.
(d) There is no phase difference between voltage and current.

Question 9: Which component of electrical impedance is responsible for storing energy in an AC circuit?

(a) Resistance (R)
(b) Inductive reactance (XL)
(c) Capacitive reactance (XC)
(d) None of the above

Question 10: In an AC circuit with a resistance of 50 ohms, an inductive reactance of 30 ohms, and a capacitive reactance of 20 ohms, what is the total electrical impedance?

(a) 50 ohms
(b) 30 ohms
(c) 10 ohms
(d) 60 ohms