This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Basic AC Parallel Circuits”.

1. In a parallel circuit, we consider _____________ instead of impedance.

a) Resistance

b) Capacitance

c) Inductance

d) Admittance

View Answer

Explanation: In a parallel circuit, we consider admittance instead of impedance, where admittance is the reciprocal of impedance.

2. In a parallel circuit, we consider admittance instead of _________

a) Resistance

b) Capacitance

c) Inductance

d) Impedance

View Answer

Explanation: In a parallel circuit, we consider admittance instead of impedance, where admittance is the reciprocal of impedance.

3. Which, among the following is the correct expression for impedance?

a) Z=Y

b) Z=1/Y

c) Z=Y^{2}

d) Z=1/Y^{2}

View Answer

Explanation: We know that impedance is the reciprocal of admittance, hence the correct expression for impedance is: Z=1/Y.

4. Which, among the following is the correct expression for admittance?

a) Y=Z

b) Y=1/Z

c) Y=Z^{2}

d) Y=1/Z^{2}

View Answer

Explanation: We know that admittance is the reciprocal of impedance, hence the correct expression for admittance is: Y=1/Z.

5. What is the unit of admittance?

a) ohm

b) henry

c) farad

d) ohm^{-1}

View Answer

Explanation: The unit for admittance is ohm

^{-1}because the unit of impedance is ohm and admittance is the reciprocal of impedance.

6. As the impedance increases, the admittance ____________

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

View Answer

Explanation: As the impedance increases, the admittance decreases because admittance is equal to 1/impedance.

7. if the impedance of a system is 4 ohm, calculate its admittance.

a) 0.25 ohm^{-1}

b) 4 ohm^{-1}

c) 25 ohm^{-1}

d) 0.4 ohm^{-1}

View Answer

Explanation: We know that: Y=1/Z.

Substituting the value of Z from the question, we get Y = 1/4 = 0.25 => Y= 0.25 ohm

^{-1}.

8. The admittance of a system is 10 ohm^{-1}, calculate its impedance.

a) 10 ohm

b) 0.1 ohm

c) 1 ohm

d) 1.1 ohm

View Answer

Explanation: We know that: Z=1/Y.

Z = 1/10 = 0.1 => Z = 0.1 ohm.

9. In A parallel circuit, with any number of impedances, The voltage across each impedance is?

a) equal

b) divided equally

c) divided proportionaly

d) zero

View Answer

Explanation: In parallel circuits, the current across the circuits vary whereas the voltage remains the same. So, voltage across each impedance is equal in parallel circuit.

10. In a parallel circuit, current in each impedance is_____________

a) equal

b) different

c) zero

d) infinite

View Answer

Explanation: In parallel circuits, the current across the circuits vary whereas the voltage remains the same. So, current in each impedance is different.

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