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Engineering Physics by S. Mani Naidu

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Multiple Choice Questions

  1. The light sources used in fibre optic communication are.    ( )
    1. LEDs
    2. semiconductor lasers
    3. phototransistors
    4. both a and b
  2. Acceptance angle is defined as the _______ angle of incidence at the endface of an optical fibre, for which the ray can be propagated in the optical fibre is.    ( )
    1. maximum
    2. minimum
    3. Either a or b
    4. none of the above
  3. The core diameter of single mode step index fibre is about:    ( )
    1. 60 to 70 µm
    2. 8 to 10 µm
    3. 100 to 250 µm
    4. 50 to 200 µm
  4. In multimode graded index fibre, light rays travel _______ in different parts of the fibre.    ( )
    1. at different speeds
    2. with same speed
    3. both a and b
    4. none of the above
  5. In optical communication system, the light detector is:    ( )
    1. Avalanche Photo Diode (APD)
    2. Positive ...

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