Test
Chapter 5 Special Purpose Diodes
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Preguntas del test (32)
1What is true about the breakdown voltage in a zener diode?
- AIt decreases when current increases.
- BIt destroys the diode.
- CIt is equal the current times the resistance.
- DIt is approximately constant.
2Which of these is the best description of a zener diode?
- AIt is a rectifier diode.
- BIt is a constant-voltage device.
- CIt is a constant-current device.
- DIt works in the forward regions.
3A zener diode
- AIs a battery.
- BHas a constant voltage in the breakdown region.
- CHas a barrier potential of 1V
- DIs forward biased.
4The voltage across the zener resistance is usually
- ASmall
- BLarge
- CMeasured in volts
- DSubtracted from the breakdown voltage
5If the series resistance increases in an unloaded zener regulator, the zener current
- ADecreases
- BStays the same
- CIncreases
- DEquals the voltage divided the resistance
6In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the
- ASource
- BSeries resistance
- CZener resistance
- DZener diode
7The load voltage is approximately constant when a zener diode is
- AForward biased
- BReverse biased
- COperating in the breakdown region
- DUnbiased
8In a loaded zener regulator, which is the largest current?
- ASeries current
- BZener current
- CLoad current
- DNone of these
9If the load resistance increases in a zener regulator, the zener current
- ADecreases
- BStays the same
- CIncreases
- DEquals the source voltage divided by the series resitance
10If the load resistance decreases in the zener regulator, the series current
- ADecreases
- BStays the same
- CIncreases
- DEquals the source voltage divided by the series resistance
11When the source voltage increases in a zener regulator, which of these currents remains approximately constant?
- ASeries current
- BZener current
- CLoad current
- DTotal current
12If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to
- A0.7 V
- B10 V
- C14 V
- D18 V
13When a zener diode is operating above its power-rated temperature
- AIt will be immediately destroyed
- BYou must decrease its power rating
- CYou must increase its power rating
- DIt will not be affected
14Which of the following will not indicate a zener diode's breakdown voltage?
- AIn-circuit voltage drop
- BCurve tracer
- CReverse-bias test circuit
- DDMM
15At high frequencies, ordinary diodes don't work properly because of
- AForward bias
- BReverse bias
- CBreakdown
- DCharge storage
16The capacitance of a varactor diode increases when the reverse voltage across it
- ADecreases
- BIncreases
- CBreaks down
- DStores charges
17Breakdown does bit destroy a zener diode, provided the zener current is less than the
- ABreakdown voltage
- BZener test current
- CMaximum zener current rating
- DBarrier potential
18As compared to a silicon rectifier diode, an LED has a
- ALower forward voltage and lower breakdown voltage
- BLower forward voltage and higher breakdown voltage
- CHigher forward voltage and lower breakdown voltage
- DHigher forward voltage and higher breakdown voltage
19To display the digit 0 in a seven segment indicator,
- AC must be off
- BG must be off
- CF must be on
- DAll segments must be lighted
20A photodiode is normally
- AForward biased
- BReverse biased
- CNeither forward nor reverse biased
- DEmitting light
21When the light decreases, the reverse minority-carrier current in a photodiode
- ADecreases
- BIncreases
- CIs unaffected
- DReverses direction
22The device associated with voltage-controlled capacitance is a
- ALight-emitting diode
- BPhotodiode
- CVaractor diode
- DZener diode
23If the depletion layer width decreases, the capacitance
- ADecreases
- BStays the same
- CIncreases
- DIs variable
24When the reverse voltage decreases, the capacitance
- ADecreases
- BStays the same
- CIncreases
- DHas more bandwidth
25The varactor is usually
- AForward biased
- BReverse biased
- CUnbiased
- DOperated in the breakdown region
26The device to use for rectifying a weak ac signal is a
- AZener diode
- BLight-emitting diode
- CVaristor
- DBack diode
27Which of the following has a negative-resistance region?
- ATunneling diode
- BStep-recovery diode
- CSchottky diode
- DOptocoupler
28A blown-fuse indicator uses a
- AZener diode
- BConstant-current diode
- CLight-emitting diode
- DPIN mode
29To isolate an output circuit from an input circuit, which is the device to use?
- ABack diode
- BOptocoupler
- CSeven-segment indicator
- DTunnel diode
30The diode with a forward voltage drop of approximately 0.25 V is the
- AStep-recovery diode
- BSchottky diode
- CBack diode
- DConstant-current diode
31For a typical operation, you need to use reverse biase with a
- AZener diode
- BPhotodiode
- CVaractor
- DAll of the above
32As the forward current through a PIN diode decreases, its resistance
- AIncerases
- BDecreases
- CRemains constant
- DCannot be determined
Información
- Descripción
- Nuclear Technology Test sobre Chapter 5 Special Purpose Diodes, creado por Caleb Wiesner el 24/04/2018.
- Autor
- Caleb Wiesner
- Idioma
- English
- Visitas
- 11
- Etiquetas
- Valoración
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