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Mixed Quiz
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1A zener diode is a silicon diode that operates in the active region.
A)True
B)False


2The zener diode must remain in the active region under all operating conditions in order for a zener regulator to hold the output voltage constant.
A)True
B)False


3A shorted component is equivalent to a resistance of infinity, and an open component is equivalent to a resistance of zero.
A)True
B)False


4Optoelectronics is the technology that combines optics and electronics.
A)True
B)False


5A seven-segment display contains seven rectangular optocouplers.
A)True
B)False


6An optoisolator combines an FET and a photodiode is a single package.
A)True
B)False


7The Schottky diode has metal on one side of the junction and therefore has a large depletion layer.
A)True
B)False


8A varactor is also called a voltage-variable capacitance.
A)True
B)False


9The negative resistance of tunnel diodes is useful in oscillator circuits.
A)True
B)False


10The zener diode is the backbone of regulators.


11 bias is required for normal operation of a zener diode.


12A circuit used when the desired dc output is less than the output of the power supply is a regulator.


13A device which is optimized for its sensitivity to light and has a window that lets light pass through the package to the junction is a .


14The combination of an LED and a photodiode is called a(n) .


15A diode has a metal such as gold or silver on one side of the junction and doped silicon on the other side.


16A device used for electronic tuning and often used in television and FM receivers is a(n) .


17A semiconductor device that operates as a variable resistor at RF and microwave frequencies is a(n) diode.


18In order to maintain a constant output voltage, the zener diode
A)must be connected to a transformer
B)must remain forward biased
C)must remain in the breakdown region
D)must be in series with a filter capacitor


19The manufacturer’s data sheet entry that lists how much the power rating of a device must be reduced is the
A)maximum power dissipation
B)reverse breakdown voltage
C)power production factor
D)derating factor


20The basic idea of voltage regulation is that the output voltage remains the same
A)with virtually no change of input voltage
B)with considerable changes of input voltage
C)when power is turned off
D)even if a passive filter is used


21Which of the following is not an advantage of a light-emitting diode (LED)?
A)low voltage
B)long life
C)fast on-off switching
D)cost


22What type of cable is comprised of thin flexible fibers of glass or plastic that transmits light beams instead of free electrons?
A)coaxial
B)stranded copper cable
C)fiber-optic
D)wave guide


23As frequency increases, small-signal diodes are no longer able to
A)switch off fast enough
B)amplify ac signals
C)be forward biased
D)serve as active filters


24The Schottky diode is sometimes called a
A)silicon rectifier
B)tunnel diode
C)cold-carrier diode
D)hot-carrier diode


25A diode that is useful in frequency multiplier circuits is a
A)snap diode
B)slope diode
C)photo diode
D)zener diode





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