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Multiple Choice Quiz
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1
Which of the following is not a benefit of using plastic fiber-optic cables rather than glass fiber-optic cables?
A)less expensive
B)less attenuation of light
C)less fragile
D)more flexible
2
Which fiber-optic cable is widely used at short to medium distances, is easiest to make, and is the least expensive?
A)step index
B)graded index
C)multimode graded index
D)multimode step index
3
A newer and better way to deal with dispersion that uses equalization techniques to adjust the received waveform to compensate for dispersion is
A)electronic dispersion compensation
B)chromatic dispersion
C)polarization mode dispersion
D)multimode graded dispersion
4
Which of the following is not one of the most important specifications of a fiber-optic cable?
A)size
B)attenuation
C)cladding
D)bandwidth
5
Which of the following terms refers to how light energy is converted to heat in the fiber-optic core material because of the impurity of glass or plastic?
A)dispersion
B)scattering
C)attenuation
D)absorption
6
In a fiber-optic cable, what determines the maximum speed of the data pulses the cable can handle?
A)absorption
B)attenuation
C)bandwidth
D)cladding
7
Which of the following light sources cannot be used in fiber-optic systems?
A)semiconductor laser
B)gallium arsenide LED
C)incandescent lamp
D)indium phosphide LED
8
The most widely used light source in fiber-optic systems is the
A)gallium arsenide LED
B)incandescent lamp
C)indium phosphide LED
D)injection laser diode
9

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In the circuit shown above, a positive pulse at the NAND gate input causes
A)the NAND output to go high
B)Q1 to turn on
C)the LED to be reverse biased
D)the LED to turn on
10
The fastest and most sensitive photodiode available is the
A)avalanche photodiode
B)PIN diode
C)photo-Darlington
D)germanium photodiode





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