Electron | MCQs

Explanation

If two or more capacitors are connected in parallel, the overall effect is that of a single equivalent capacitor having the sum total of the plate areas of the individual capacitors.

As we've just seen, an increase in plate area, with all other factors unchanged, results in increased capacitanc

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RY 23-12-2022

Explanation

 When a forward bias is applied to a p-n junction:

The potential barrier decreases.

Electrons from the n-side move toward the p-side.

These electrons are minority carriers on the p-side.

As a result, the concentration of electrons on the p-side increases, but only slightly, since it's still a small number compared to the holes (which are majority carriers on the p-side).

Explanation

In semiconductors, as the temperature increases, more electrons gain enough energy to jump from the valence band to the conduction band.

This increase in free charge carriers results in higher electrical conductivity.

This is opposite to metals, where conductivity decreases with temperature due to increased scattering of electrons.

Explanation

If an electron has zero orbital angular momentum, its magnetic dipole moment also equals zero

This is because the magnetic dipole moment is directly proportional to the orbital angular momentum, and when the angular momentum is zero, the magnetic moment is also zero. 

Explanation

A diode characteristic curve is a plot between voltage and current.

It shows the relationship between the applied voltage across the diode and the resulting current.

It indicating the diode's behavior in both forward and reverse bias.

Explanation

Full wave rectification is given by four diodes connected in bridge type arrangement.

This configuration allows both halves of the A.C. waveform to be used, producing a smoother and more efficient output compared to half-wave rectification.

Explanation

The component of electronics that acts as a rectifier is a diode.

Diodes allow current to flow in one direction only.

It enabling the conversion of alternating current (A.C.) into direct current (D.C.) by blocking the reverse flow.

Explanation

A SCR (Silicon Controlled Rectifier) has three pn junctions.

It consists of four layers of semiconductor material, forming a PNPN structure with three PN junctions.

Explanation

A thermistor has a negative temperature coefficient of resistance.

As temperature increases, its resistance decreases, which is opposite to most materials.

Explanation

A lumped parameter circuit delay line is a low-pass filter.

It allows low-frequency signals to pass through while attenuating higher frequencies, effectively delaying the signal.