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Quiz von Katrina Himes, aktualisiert more than 1 year ago
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Erstellt von Katrina Himes
vor etwa 6 Jahre
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Frage 1
Frage
The nucleus of a copper atom contains how many protons?
Antworten
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1
-
4
-
18
-
29
Frage 2
Frage
The net charge of a neutral copper atom is
Antworten
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0
-
+1
-
-1
-
+4
Frage 3
Frage
Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
Antworten
-
0
-
+1
-
-1
-
+4
Frage 4
Frage
The valence electron of a copper atom experiences what kind of attraction toward the nucleus ?
Antworten
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None
-
Weak
-
Strong
-
Impossible to say
Frage 5
Frage
How many valence electrons does a silicon atom have?
Antworten
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0
-
1
-
2
-
4
Frage 6
Frage
Which is the most widely used semiconductor?
Antworten
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Copper
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Germanium
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Silicon
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None of the above
Frage 7
Frage
How many protons does the nucleus of a silicon atom contain?
Antworten
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4
-
14
-
29
-
32
Frage 8
Frage
Silicon atoms combine into an orderly pattern called a
Antworten
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Covalent bond
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Crystal
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Semiconductor
-
Valence orbit
Frage 9
Frage
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Antworten
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Doping
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Free electrons
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Thermal energy
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Valence electrons
Frage 10
Frage
When an electron is moved to a higher orbit level, its energy level with respect to the nucleus
Antworten
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Increases
-
Decreases
-
Remains the same
-
Depends on the type of atom
Frage 11
Frage
The merging of a free electron and a hole is called
Antworten
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Covalent bonding
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Lifetime
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Recombination
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Thermal energy
Frage 12
Frage
At room temperature, an intrinsic silicon crystal acts approximately like
Antworten
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A battery
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A conductor
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An insulator
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A piece of copper wire
Frage 13
Frage
The amount of time between the creation of a hole and its disappearance is called
Antworten
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Doping
-
Lifetime
-
Recombination
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Valence
Frage 14
Frage
The valence electron of a conductor can also be called a
Antworten
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Bound electron
-
Free electron
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Nucleus
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Proton
Frage 15
Frage
A conductor has how many types of flow?
Antworten
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1
-
2
-
3
-
4
Frage 16
Frage
A semiconductor has how many types of flow?
Antworten
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1
-
2
-
3
-
4
Frage 17
Frage
When a voltage is applied to a semiconductor, holes will flow
Antworten
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Away from the negative potential
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Toward the positive potential
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In the external circuit
-
None of the above
Frage 18
Frage
For semiconductor material, its valence orbit is saturated when it contains
Antworten
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One electron
-
Equal (+) and (-) ions
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Four electrons
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Eight electrons
Frage 19
Frage
In an intrinsic semiconductor, the number of holes
Antworten
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Equals the number of free electrons
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Is greater than the number of free electrons
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Is less than the number of free electrons
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None of the above
Frage 20
Frage
Absolute zero temperature equals
Antworten
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-273 °C
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0 °C
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25 °C
-
50 °C
Frage 21
Frage
At absolute zero temperature, an intrinsic semiconductor has
Antworten
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A few free electrons
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Many holes
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Many free electrons
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No holes or free electrons
Frage 22
Frage
At room temperature, an intrinsic semiconductor has
Antworten
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A few free electrons and holes
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Many holes
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Many free electrons
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No holes
Frage 23
Frage
The number of free electrons and holes in an intrinsic semiconductor decreases when the temperature
Antworten
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Decreases
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Increases
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Stays the same
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None of the above
Frage 24
Frage
The flow of valence electrons to the right means that holes are flowing to the
Antworten
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Left
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Right
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Either way
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None of the above
Frage 25
Frage
Holes act like
Antworten
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Atoms
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Crystals
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Negative charges
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Positive charges
Frage 26
Frage
Trivalent atoms have how many valence electrons?
Antworten
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1
-
3
-
4
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5
Frage 27
Frage
An acceptor atom has how many valence electrons?
Antworten
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1
-
3
-
4
-
5
Frage 28
Frage
If you wanted to produce a p-type semiconductor, which of these would you use?
Antworten
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Acceptor atoms
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Donor atoms
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Pentavalent impurity
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Silicon
Frage 29
Frage
Electrons are the minority carriers in which type of semiconductor?
Antworten
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Extrinsic
-
Intrinsic
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n-type
-
p-type
Frage 30
Frage
How many free electrons does a p-type semiconductor contain?
Antworten
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Many
-
None
-
Only those produced by thermal energy
-
Same number as holes
Frage 31
Frage
Silver is the best conductor. How many valence electrons do you think it has?
Antworten
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1
-
4
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18
-
29
Frage 32
Frage
Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature drops to 0°C, how many holes are there?
Antworten
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Fewer than 1 billion
-
1 billion
-
More than 1 billion
-
Impossible to say
Frage 33
Frage
An external voltage source is applied to a p-type semiconductor. If the left end of the crystal is positive, which way do the majority carriers flow?
Antworten
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Left
-
Right
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Neither
-
Impossible to say
Frage 34
Frage
Which of the following doesn't fit in the group?
Antworten
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Conductor
-
Semiconductor
-
Four valence electrons
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Crystal structure
Frage 35
Frage
Which of the following is approximately equal to room temperature?
Antworten
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0°C
-
25°C
-
50°C
-
75°C
Frage 36
Frage
How many electrons are there in the valence orbit of a silicon atom within a crystal?
Antworten
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1
-
4
-
8
-
14
Frage 37
Frage
Negative ions are atoms that have
Antworten
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Gained a proton
-
Lost a proton
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Gained an electron
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Lost an electron
Frage 38
Frage
Which of the following describes an n-type semiconductor?
Antworten
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Neutral
-
Positively charged
-
Negatively charged
-
Has many holes
Frage 39
Frage
A p-type semiconductor contains holes an
Antworten
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Positive ions
-
Negative ions
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Pentavalent atoms
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Donor atoms
Frage 40
Frage
Which of the following describes a p-type semiconductor?
Antworten
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Neutral
-
Positively charged
-
Negatively charged
-
Has many free elctrons
Frage 41
Frage
When compared to a germanium diode, a silicon diode's reverse saturation current is
Antworten
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Equal at high temperatures
-
Lower
-
Equal at lower temperatures
-
Higher
Frage 42
Frage
What causes the depletion layer?
Antworten
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Doping
-
Recombination
-
Barrier potential
-
Ions
Frage 43
Frage
What is the barrier potential of a silicon diode at room temperature?
Antworten
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0.3 V
-
0.7 V
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1 V
-
2 mV per degree Celsius
Frage 44
Frage
When comparing the energy gap of germanium and silicon atoms, a silicon atom's energy gap is
Antworten
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About the same
-
Lower
-
Higher
-
Unpredictable
Frage 45
Frage
In a silicon diode, the reverse current is usually
Antworten
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Very small
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Very large
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Zero
-
In the breakdown region
Frage 46
Frage
While maintaining a constant temperature, a silicon diode has its reverse-bias voltage increased. The diode's saturation current will
Antworten
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Increase
-
Decrease
-
Remain the same
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Equal its surface-leakage current
Frage 47
Frage
The voltage where avalanche occurs is called the
Antworten
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Barrier potential
-
Depletion layer
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Knee voltage
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Breakdown voltage
Frage 48
Frage
The width of a diode's depletion layer will decrease when the diode is
Antworten
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Forward biased
-
First formed
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Reverse biased
-
Not conducting
Frage 49
Frage
When the reverse voltage decreases from 10 to 5 V, the depletion layer
Antworten
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Becomes smaller
-
Becomes larger
-
Is unaffected
-
Breaks down
Frage 50
Frage
When a diode is forward biased, the recombination of free electrons and holes may produce
Antworten
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Heat
-
Light
-
Radiation
-
All of the above
Frage 51
Frage
A reverse voltage of 10 V is across a diode. What is the voltage across the depletion layer?
Antworten
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0 V
-
0.7 V
-
10 V
-
None of the above
Frage 52
Frage
The energy gap in a silicon atom is the distance between the valence band and the
Antworten
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Nucleus
-
Conduction band
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Atom's core
-
Positive ions
Frage 53
Frage
The reverse saturation current doubles when the junction temperature increases
Antworten
-
1°C
-
2°C
-
4°C
-
10°C
Frage 54
Frage
The surface-leakage current doubles when the reverse voltage increases
Antworten
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7%
-
100%
-
200%
-
2 mV
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