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Quiz: EDC- Basics OPTO electronics

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Number of Questions: 20

Question: 1 -

A certain optical fibre has refractive index of clad (n1) = 1.40 and that of core (n2) = 1.05 . Its numerical aperture will be

Options:

  1. 0.35

  2. 0.1585

  3. 0.8575

  4. 0.926

    5. Answer:

    0.926
    Solution not available.

Question: 2 -

In an opto-electronic communication system , the system component in which free electrons are involved in its operation is ,

Options:

  1. Photo Detector

  2. Coupling device employed with the optical fibre

  3. Laser

  4. Optical fibre

    5. Answer:

    Photo Detector
    Solution not available.

Question: 3 -

Velocity of light travelling in an optical fibre is ,

Options:

  1. Greater than c by a few percent

  2. Less than c by a few percent

  3. Much greater than c , approaching the magnitude of c2

  4. Equal c

    5. Answer:

    Greater than c by a few percent
    Solution not available.

Question: 4 -

The most suitable material for making an LDR (light dependent resistor) is a semiconductor material having

Options:

  1. Eg > hv

  2. Eg << hv

  3. Eg >> hv

  4. Eg = hv

    5. Answer:

    Eg << hv
    Solution:

    For operation of LDR , Eg << hv

Question: 5 -

Which of the following is true for silicon and Germanium ?

Options:

  1. Both are indirect band gap

  2. Both are direct band gap material

  3. Silicon is direct band gap while germanium is indirect band gap

  4. Silicon is indirect band gap while germanium is direct band gap

    5. Answer:

    Both are indirect band gap
    Solution:

    Both are indirect band gap . So can't be used for LED