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Q: Which law states that the algebraic sum of currents meeting at a junction in a circuit is zero?

Kirchhoff’s Current Law — KCL (Kirchhoff’s Current Law) is based on the law of conservation of charge, stating that the total current entering a junction equals the current leaving.

Q: The core of a transformer is laminated to:

Reduce eddy current loss — Laminating the core increases the electrical resistance of the path for eddy currents, thereby minimizing energy loss due to heating.

Q: In a P-N junction diode, the depletion region is caused by:

Recombination of electrons and holes — At the junction, free electrons from the N-side diffuse to the P-side and fill holes, creating a region devoid of mobile charge carriers.

Q: If the frequency of input supply of a transformer is increased, the secondary output voltage:

Increases — The EMF equation E = 4.44fN?m shows that E is directly proportional to frequency (f) for a given flux.

Q: Which material is commonly used in the base region of a BJT?

Lightly doped semiconductor — The base is made very thin and lightly doped to ensure that most charge carriers from the emitter pass to the collector instead of recombining.

Q: The power factor of a purely resistive circuit is:

Unity — In a purely resistive circuit, voltage and current are in phase, so the phase angle difference is 0°, and cos(0°) = 1.

Q: An ideal transformer has:

Zero resistance and core loss — An ideal transformer assumes no winding resistance, no magnetic leakage, and infinite permeability of the core, resulting in 100% efficiency.

Q: What is the primary function of a Zener diode?

Voltage regulation — Zener diodes are specifically designed to operate in the breakdown region, maintaining a constant voltage across them even with current variations.

Q: The internal resistance of an ideal voltage source is:

Zero — An ideal voltage source maintains the same voltage across its terminals regardless of the current drawn, implying zero internal impedance.

Q: Transformer oil is used for:

Cooling and insulation — Transformer oil acts as a coolant to dissipate heat and as an insulator to prevent arcing between windings.

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Question 1 of 10

Which law states that the algebraic sum of currents meeting at a junction in a circuit is zero?

KCL (Kirchhoff’s Current Law) is based on the law of conservation of charge, stating that the total current entering a junction equals the current leaving.

Question 2 of 10

The core of a transformer is laminated to:

Laminating the core increases the electrical resistance of the path for eddy currents, thereby minimizing energy loss due to heating.

Question 3 of 10

In a P-N junction diode, the depletion region is caused by:

At the junction, free electrons from the N-side diffuse to the P-side and fill holes, creating a region devoid of mobile charge carriers.

Question 4 of 10

If the frequency of input supply of a transformer is increased, the secondary output voltage:

The EMF equation E = 4.44fN?m shows that E is directly proportional to frequency (f) for a given flux.

Question 5 of 10

Which material is commonly used in the base region of a BJT?

The base is made very thin and lightly doped to ensure that most charge carriers from the emitter pass to the collector instead of recombining.

Question 6 of 10

The power factor of a purely resistive circuit is:

In a purely resistive circuit, voltage and current are in phase, so the phase angle difference is 0°, and cos(0°) = 1.

Question 7 of 10

An ideal transformer has:

An ideal transformer assumes no winding resistance, no magnetic leakage, and infinite permeability of the core, resulting in 100% efficiency.

Question 8 of 10

What is the primary function of a Zener diode?

Zener diodes are specifically designed to operate in the breakdown region, maintaining a constant voltage across them even with current variations.

Question 9 of 10

The internal resistance of an ideal voltage source is:

An ideal voltage source maintains the same voltage across its terminals regardless of the current drawn, implying zero internal impedance.

Question 10 of 10

Transformer oil is used for:

Transformer oil acts as a coolant to dissipate heat and as an insulator to prevent arcing between windings.

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