BEE FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers 2

Question 1

What is the SI unit of electrical capacitance?

Accepted Answer

Farad

Answer

The farad (F) is the SI unit of electrical capacitance, named after Michael Faraday.

Question 2

In a purely resistive AC circuit, what is the phase angle between voltage and current?

Accepted Answer

0 degrees

Answer

In a purely resistive circuit, voltage and current are in phase, meaning the phase angle is zero degrees.

Question 3

Which theorem states that any linear bilateral network can be replaced by an equivalent voltage source in series with an impedance?

Accepted Answer

Thevenin's theorem

Answer

Thevenin's theorem simplifies a complex linear circuit to a single voltage source and series impedance.

Question 4

What happens to the total resistance when resistors are connected in parallel?

Accepted Answer

It decreases below the smallest individual resistance

Answer

Parallel resistors always yield a total resistance smaller than the smallest individual resistor in the combination.

Question 5

What is the time constant of an RC circuit with R = 10 kohm and C = 100 microfarads?

Accepted Answer

1 second

Answer

The time constant tau equals R times C, so 10,000 ohms multiplied by 0.0001 farads equals 1 second.

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