FlexiQuiz - QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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1. In the breakdown region, Zener voltage remains constant even though the current through the Zener diode changes.This characteristics is used in

voltage regulation

voltage generation

light emission

transformer

2. For the detection of optical signal

Energy of photon > Band gap

Energy of photon greater or equals to the Band gap

Energy of photon = Band gap

Energy of photon < Band gap

3. Zener Diode is

lightly doped

no doping is there

moderately doped

heavily doped

4. Why photo diode is operated under reverse bias

it is difficult to observe the fractional change in the reverse current with change in the light intensity.

it is easier to observe the change in the reverse current with change in the light intensity.

it is easier to observe the fractional change in the forward current with change in the light intensity.

it is easier to observe the fractional change in the reverse current with change in the light intensity.

5. A very high juntion electric field is obtained in Zener diode by

moderate doping

light doping

heavy doping

no doping

6. Why reverse current upto breakdown is almont independent of apllied voltage?

Because reverse current is due to minority charge carrier and a small voltage is sufficient to sweep the minority carriers from one side of the junction to the other side of the junction.

because diode does not conduct in reverse bias

this statement is wrong

because resistance control the current

7. Name the diode which is used in reverse breakdown region.

Zener diode

Photodiode

Solar cell

LED

8. Why reverse current suddenly increases at the breakdown voltage

avalanche breakdown and then internal field emission or field ionisation

due to temperature increase

due to collision of electrons with ions

internal field emission or field ionisation and then avalanche breakdown

9. A diode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect wavelength of 6000 nm?

Yes, because energy of photon is 0.207 eV which is less than 2.8 eV

No, because energy of photon is 0.207 eV which is less than 2.8 eV

No, because energy of photon is 2.07 eV which is less than 2.8 eV

Yes, because energy of photon is 2.07 eV which is less than 2.8 eV

10. The diode which is used to detect optical signal is

LED

photodiode

solar cell

zener diode

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QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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