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

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1. 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 fractional 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 change in the reverse current with change in the light intensity.

2. For the detection of optical signal

Energy of photon > Band gap

Energy of photon < Band gap

Energy of photon = Band gap

Energy of photon greater or equals to the Band gap

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

LED

zener diode

solar cell

photodiode

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

voltage regulation

transformer

light emission

voltage generation

5. 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 resistance control the current

this statement is wrong

because diode does not conduct in reverse bias

6. 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

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

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

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

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

Zener diode

LED

Solar cell

Photodiode

8. Why reverse current suddenly increases at the breakdown voltage

avalanche breakdown and then internal field emission or field ionisation

internal field emission or field ionisation and then avalanche breakdown

due to collision of electrons with ions

due to temperature increase

9. Zener Diode is

lightly doped

heavily doped

moderately doped

no doping is there

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

moderate doping

no doping

heavy doping

light doping

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QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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