CS(Hons)

A semiconductor has ………… temperature coefficient of resistance.

• Positive

• Zero

• Negative

• None of the above

When a pure semiconductor is heated, its resistance …………..

• Goes up

• Goes down

• Remains the same

• Can’t say

Why is there a sudden increase in current in Zener diode?

• Due to the rupture of ionic bonds

• Due to rupture of covalent bonds

• Due to viscosity

• Due to potential difference

 What is rectification?

• Process of conversion of ac into dc

• Process of conversion of low ac into high ac

• Process of conversion of dc into ac

• Process of conversion of low dc into high dc

Forward biasing of p-n junction offers infinite resistance

• True

• False

Identify the condition for a transistor to act as an amplifier.

• The emitter-base junction is forward biased and the base-collector junction is reverse biased

• No bias voltage is required

• Both junctions are forward biased

• Both junctions are reverse biased

Temperature and conductivity are directly proportional in __________

• Conductors

• Semiconductors

• Insulators

• None of the above

Saturation current in the diode is caused due to _____________ carriers.

• Majority

• Minority

• Moderate

• All the above

For the given circuit and input waveform, the peak value of the output is +30V.

• True

• False

The circuit behaves as

• positive clipper with its negative peak at -50V

• positive clipper with its positive peak at -50V

• positive clipper with its positive peak at 60V

• positive clipper with its negative peak at -10V