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Quiz: EDC- Basics OPTO electronics

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Number of Questions: 20

Question: 1 -

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: 2 -

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

Options:

  1. Optical fibre

  2. Laser

  3. Coupling device employed with the optical fibre

  4. Photo Detector

    5. Answer:

    Photo Detector
    Solution not available.

Question: 3 -

Which of the following is true for silicon and Germanium ?

Options:

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

  2. Both are indirect band gap

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

  4. Both are direct band gap material

    5. Answer:

    Both are indirect band gap
    Solution:

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

Question: 4 -

Velocity of light travelling in an optical fibre is ,

Options:

  1. Greater than c by a few percent

  2. Equal c

  3. Less than c by a few percent

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

    5. Answer:

    Greater than c by a few percent
    Solution not available.

Question: 5 -

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. 0.1585

  2. 0.35

  3. 0.8575

  4. 0.926

    5. Answer:

    0.926
    Solution not available.