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Quiz: EDC- Basics OPTO electronics

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Number of Questions: 20

Question: 11 -

Population inversion refers to

Options:

  1. Population of the lowest state is maximum

  2. Population of higher level is more than that of lower level

  3. population of the lower level is more than that of the higher level

  4. Population of the ionized state is maximum

    5. Answer:

    Population of higher level is more than that of lower level
    Solution not available.

Question: 12 -

Intensity of a laser beam does not decrease with distance in accordance with the inverse - Equane law because the laser light

Options:

  1. Is monochromatic

  2. Obey's Plank's law

  3. Is very directional

  4. Is very intense

    5. Answer:

    Is very directional
    Solution not available.

Question: 13 -

When excited electrons in an LED revert from conduction band to valence band , the phenomenon used is

Options:

  1. Formation of photons

  2. None of the above

  3. Radiative recombination

  4. Energy transfer from one electron to other

    5. Answer:

    Radiative recombination
    Solution not available.

Question: 14 -

A double hetro junction LED emitting a peak wavelength of 1310 nm has radiator and non radioactive recombination tie of 50 & 100 ns respectively . What is the bulk recombination life line ?

Options:

  1. 25 ns

  2. 33.33 ns

  3. 50 ns

  4. 100 ns

    5. Answer:

    33.33 ns
    Solution not available.

Question: 15 -

In a photo diode light is focused to fall on

Options:

  1. Full p and n - region

  2. p - region

  3. Junction region

  4. n - region

    5. Answer:

    Junction region
    Solution not available.