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Test 2 study for final

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Nuclear Program Quiz on Test 2 study for final, created by Katrina Himes on 04/06/2018.
Katrina Himes
Quiz by Katrina Himes, updated more than 1 year ago
Katrina Himes
Created by Katrina Himes over 6 years ago
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Resource summary

Question 1

Question
Which of these is the best description of a zener diode?
Answer
  • It is a rectifier diode.
  • It is a constant-voltage device.
  • It is a constant-current device.
  • It works in the forward region.

Question 2

Question
A transistor has how many pn junctions?
Answer
  • 1
  • 2
  • 3
  • 4

Question 3

Question
The current gain of a transistor is defined as the ratio of the collector current to the
Answer
  • Base current
  • Emitter current
  • Supply current
  • Collector current

Question 4

Question
A zener diode
Answer
  • Is a battery
  • Has a constant voltage in the breakdown region
  • Has a barrier potential of 1 V
  • Is forward biased

Question 5

Question
The barrier potential across each silicon deletion layer is
Answer
  • 0
  • 0.3 V
  • 0.7 V
  • 1 V

Question 6

Question
When the base resistor increases, the collector voltage will probably
Answer
  • Decrease
  • Stay the same
  • Increase
  • Do all of the above

Question 7

Question
If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to
Answer
  • 0.7 V
  • 10 V
  • 14 V
  • 18 V

Question 8

Question
The emitter diode is usually
Answer
  • Forward biased
  • Reverse biased
  • Nonconducting
  • Operating in the breakdown region

Question 9

Question
If the base resistor is very small, the transistor will operate in the
Answer
  • Cutoff region
  • Active region
  • Saturation region
  • Breakdown region

Question 10

Question
At high frequencies, ordinary diodes don't work properly because of
Answer
  • Forward bias
  • Reverse bias
  • Breakdown
  • Charge storage

Question 11

Question
For normal operation of the transistor, the collector diode has to be
Answer
  • Forward biased
  • Reversed biased
  • Nonconducting
  • Operating in the breakdown region

Question 12

Question
Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
Answer
  • 0
  • A few tenths of a volt
  • 1 V
  • Supply voltage

Question 13

Question
Breakdown does not destroy a zener diode, provided the zener current is less than the
Answer
  • Breakdown voltage
  • Zener test current
  • Maximum zener current rating
  • Barrier potential

Question 14

Question
Most of the electrons in the base of an npn transistor flow
Answer
  • Out of the base lead
  • Into the collector
  • Into the emitter
  • Into the base supply

Question 15

Question
If the base supply voltage is disconnected, the collector-emitter voltage will equal
Answer
  • 0 V
  • 6 V
  • 10.5 V
  • Collector supply voltage

Question 16

Question
A photodiode is normally
Answer
  • Forward biased
  • Reverse biased
  • Neither forward nor reverse biased
  • Emitting light

Question 17

Question
The base-emitter voltage is usually
Answer
  • Less than the base supply voltage
  • Equal to the base supply voltage
  • More than the base supply voltage
  • Cannot answer

Question 18

Question
The base current is 50 μA. If the current gain is 100, the collector current is closest in value to
Answer
  • 50 μA
  • 500 μA
  • 2 mA
  • 5 mA

Question 19

Question
The device associated with voltage controlled capacitance is a
Answer
  • Light-emitting diode
  • Photodiode
  • Varactor diode
  • Zener diode

Question 20

Question
The beta of a transistor is the ratio of the
Answer
  • Collector current to the emitter current
  • Collector current to base current
  • Base current to collector current
  • Emitter current to collector current

Question 21

Question
A circuit with a fixed emitter current is called
Answer
  • Base bias
  • Emitter bias
  • Transistor bias
  • Two-supply bias

Question 22

Question
To isolate an output circuit from an input circuit, which is the device to use?
Answer
  • Back diode
  • Optocoupler
  • Seven-segment indicator
  • Tunnel diode

Question 23

Question
The collector-emitter voltage is usually
Answer
  • Less than the collector supply voltage
  • Equal to the collector supply voltage
  • More than the collector supply voltage
  • Cannot answer

Question 24

Question
When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current
Answer
  • Remains almost the same
  • Decreases by a factor of 6
  • Increases by a factor of 6
  • Is zero

Question 25

Question
If the base resistor is open, what is the collector current?
Answer
  • 0
  • 1 mA
  • 2 mA
  • 10 mA
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