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Entrance Exams
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Topics in Electrical Engg (EEE)
For a node in a circuit applying Kirchhoff's Current Law (KCL), the sum of currents entering equals:
Correct Answer:
A. The sum of currents leaving the node
EXPLANATION
KCL states that the algebraic sum of currents at a node is zero, meaning currents entering equal currents leaving.
The resonant frequency of a series RLC circuit is given by:
Correct Answer:
A. f = 1/(2π√LC)
EXPLANATION
At resonance, XL = XC, leading to the resonant frequency formula f₀ = 1/(2π√LC).
In a purely resistive AC circuit, the phase difference between voltage and current is:
Correct Answer:
A. 0°
EXPLANATION
In a purely resistive circuit, voltage and current are in phase, so the phase difference is 0°.
For maximum power transfer in a DC circuit, the load resistance RL should be equal to:
Correct Answer:
A. The Thevenin equivalent resistance RTh
EXPLANATION
Maximum Power Transfer Theorem states that maximum power is delivered when load resistance equals the Thevenin equivalent resistance of the source.
The power factor of an AC circuit is defined as:
Correct Answer:
A. cos(φ) where φ is the phase angle between voltage and current
EXPLANATION
Power factor is the cosine of the phase angle between voltage and current, representing the fraction of apparent power that is real power.
In a series RLC circuit, the impedance Z is given by:
Correct Answer:
A. Z = √(R² + (XL - XC)²)
EXPLANATION
Impedance in a series RLC circuit is the vector sum of resistance and net reactance. Z = √(R² + (XL - XC)²) is the standard formula.
