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 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= 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.

Substituting the value of Y from the question, we get Z= 0.1 ohm.

9. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

a) The other bulb blows out as well

b) The other bulb continues to glow with the same brightness

c) The other bulb glows with increased brightness

d) The other bulb stops glowing

View Answer

Explanation: In a parallel circuit, if one bulb blows out, it acts as an open circuit. Current does not flow in that branch but it continues to flow in the other branch hence the bulb continues to glow.

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

a) The same for all impedances

b) Is divided equally among all impedances

c) Is divided proportionally across all impedances

d) Is zero for all impedances

View Answer

Explanation: In parallel circuits, the current across the circuits vary whereas the voltage remains the same.

**Sanfoundry Global Education & Learning Series – Basic Electrical Engineering.**

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