BE/B Eng Bachelor of Engineering Electrical Engineering 1 — Questions and Answers
Question 1: What is the SI unit of electric charge?
- Coulomb (Correct answer)
- Ampere
- Volt
- Farad
Correct answer: Coulomb
The coulomb (C) is the SI unit of electric charge, equal to the charge transported by a current of one ampere in one second.
Question 2: Ohm's Law states that voltage equals current multiplied by which quantity?
- Resistance (Correct answer)
- Capacitance
- Inductance
- Impedance
Correct answer: Resistance
Ohm's Law (V = IR) states that voltage equals current times resistance for a linear circuit element.
Question 3: In a series RLC circuit at resonance, what is true about the impedance?
- Impedance is at its minimum (Correct answer)
- Impedance is at its maximum
- Impedance equals inductance
- Impedance is zero
Correct answer: Impedance is at its minimum
At resonance in a series RLC circuit, the inductive and capacitive reactances cancel, leaving only resistance, so impedance is minimized.
Question 4: Which theorem states that any linear two-terminal network can be replaced by an equivalent voltage source in series with an impedance?
- Thevenin's Theorem (Correct answer)
- Norton's Theorem
- Superposition Theorem
- Kirchhoff's Theorem
Correct answer: Thevenin's Theorem
Thevenin's Theorem allows simplification of complex linear circuits into a single voltage source (Vth) in series with an equivalent resistance (Rth).
Question 5: What does a transformer primarily use to transfer energy between circuits?
- Mutual inductance (Correct answer)
- Capacitive coupling
- Resistive coupling
- Direct conduction
Correct answer: Mutual inductance
A transformer transfers electrical energy between circuits via mutual inductance through a shared magnetic core.
Question 6: The power factor of a purely resistive AC circuit is:
- 1 (Correct answer)
- 0
- 0.5
- Infinity
Correct answer: 1
A purely resistive circuit has a power factor of 1 because voltage and current are in phase, so all power is real power.
BE/B Eng Bachelor of Engineering Electrical Engineering 1
What is the SI unit of electric charge?