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

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

no doping

heavy doping

moderate doping

light doping

2. Why reverse current suddenly increases at the breakdown voltage

internal field emission or field ionisation and then avalanche breakdown

due to collision of electrons with ions

avalanche breakdown and then internal field emission or field ionisation

due to temperature increase

3. 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 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

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

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

transformer

light emission

voltage regulation

voltage generation

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

LED

Solar cell

Zener diode

Photodiode

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

zener diode

solar cell

LED

photodiode

7. Why photo diode is operated under reverse bias

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 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.

8. Zener Diode is

heavily doped

moderately doped

lightly doped

no doping is there

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

because resistance control the current

this statement is wrong

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

10. 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

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QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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