13215603
Descrição
Quiz por Katrina Himes, atualizado more than 1 year ago
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Criado por Katrina Himes
mais de 6 anos atrás
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|
Questão 1
Questão
The nucleus of a copper atom contains how many protons?
Responda
-
1
-
4
-
18
-
29
Questão 2
Questão
The net charge of a neutral copper atom is
Responda
-
0
-
+1
-
-1
-
+4
Questão 3
Questão
Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
Responda
-
0
-
+1
-
-1
-
+4
Questão 4
Questão
The valence electron of a copper atom experiences what kind of attraction toward the nucleus ?
Responda
-
None
-
Weak
-
Strong
-
Impossible to say
Questão 5
Questão
How many valence electrons does a silicon atom have?
Responda
-
0
-
1
-
2
-
4
Questão 6
Questão
Which is the most widely used semiconductor?
Responda
-
Copper
-
Germanium
-
Silicon
-
None of the above
Questão 7
Questão
How many protons does the nucleus of a silicon atom contain?
Responda
-
4
-
14
-
29
-
32
Questão 8
Questão
Silicon atoms combine into an orderly pattern called a
Responda
-
Covalent bond
-
Crystal
-
Semiconductor
-
Valence orbit
Questão 9
Questão
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Responda
-
Doping
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Free electrons
-
Thermal energy
-
Valence electrons
Questão 10
Questão
When an electron is moved to a higher orbit level, its energy level with respect to the nucleus
Responda
-
Increases
-
Decreases
-
Remains the same
-
Depends on the type of atom
Questão 11
Questão
The merging of a free electron and a hole is called
Responda
-
Covalent bonding
-
Lifetime
-
Recombination
-
Thermal energy
Questão 12
Questão
At room temperature, an intrinsic silicon crystal acts approximately like
Responda
-
A battery
-
A conductor
-
An insulator
-
A piece of copper wire
Questão 13
Questão
The amount of time between the creation of a hole and its disappearance is called
Responda
-
Doping
-
Lifetime
-
Recombination
-
Valence
Questão 14
Questão
The valence electron of a conductor can also be called a
Responda
-
Bound electron
-
Free electron
-
Nucleus
-
Proton
Questão 15
Questão
A conductor has how many types of flow?
Responda
-
1
-
2
-
3
-
4
Questão 16
Questão
A semiconductor has how many types of flow?
Responda
-
1
-
2
-
3
-
4
Questão 17
Questão
When a voltage is applied to a semiconductor, holes will flow
Responda
-
Away from the negative potential
-
Toward the positive potential
-
In the external circuit
-
None of the above
Questão 18
Questão
For semiconductor material, its valence orbit is saturated when it contains
Responda
-
One electron
-
Equal (+) and (-) ions
-
Four electrons
-
Eight electrons
Questão 19
Questão
In an intrinsic semiconductor, the number of holes
Responda
-
Equals the number of free electrons
-
Is greater than the number of free electrons
-
Is less than the number of free electrons
-
None of the above
Questão 20
Questão
Absolute zero temperature equals
Responda
-
-273 °C
-
0 °C
-
25 °C
-
50 °C
Questão 21
Questão
At absolute zero temperature, an intrinsic semiconductor has
Responda
-
A few free electrons
-
Many holes
-
Many free electrons
-
No holes or free electrons
Questão 22
Questão
At room temperature, an intrinsic semiconductor has
Responda
-
A few free electrons and holes
-
Many holes
-
Many free electrons
-
No holes
Questão 23
Questão
The number of free electrons and holes in an intrinsic semiconductor decreases when the temperature
Responda
-
Decreases
-
Increases
-
Stays the same
-
None of the above
Questão 24
Questão
The flow of valence electrons to the right means that holes are flowing to the
Responda
-
Left
-
Right
-
Either way
-
None of the above
Questão 25
Questão
Holes act like
Responda
-
Atoms
-
Crystals
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Negative charges
-
Positive charges
Questão 26
Questão
Trivalent atoms have how many valence electrons?
Responda
-
1
-
3
-
4
-
5
Questão 27
Questão
An acceptor atom has how many valence electrons?
Responda
-
1
-
3
-
4
-
5
Questão 28
Questão
If you wanted to produce a p-type semiconductor, which of these would you use?
Responda
-
Acceptor atoms
-
Donor atoms
-
Pentavalent impurity
-
Silicon
Questão 29
Questão
Electrons are the minority carriers in which type of semiconductor?
Responda
-
Extrinsic
-
Intrinsic
-
n-type
-
p-type
Questão 30
Questão
How many free electrons does a p-type semiconductor contain?
Responda
-
Many
-
None
-
Only those produced by thermal energy
-
Same number as holes
Questão 31
Questão
Silver is the best conductor. How many valence electrons do you think it has?
Responda
-
1
-
4
-
18
-
29
Questão 32
Questão
Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature drops to 0°C, how many holes are there?
Responda
-
Fewer than 1 billion
-
1 billion
-
More than 1 billion
-
Impossible to say
Questão 33
Questão
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?
Responda
-
Left
-
Right
-
Neither
-
Impossible to say
Questão 34
Questão
Which of the following doesn't fit in the group?
Responda
-
Conductor
-
Semiconductor
-
Four valence electrons
-
Crystal structure
Questão 35
Questão
Which of the following is approximately equal to room temperature?
Responda
-
0°C
-
25°C
-
50°C
-
75°C
Questão 36
Questão
How many electrons are there in the valence orbit of a silicon atom within a crystal?
Responda
-
1
-
4
-
8
-
14
Questão 37
Questão
Negative ions are atoms that have
Responda
-
Gained a proton
-
Lost a proton
-
Gained an electron
-
Lost an electron
Questão 38
Questão
Which of the following describes an n-type semiconductor?
Responda
-
Neutral
-
Positively charged
-
Negatively charged
-
Has many holes
Questão 39
Questão
A p-type semiconductor contains holes an
Responda
-
Positive ions
-
Negative ions
-
Pentavalent atoms
-
Donor atoms
Questão 40
Questão
Which of the following describes a p-type semiconductor?
Responda
-
Neutral
-
Positively charged
-
Negatively charged
-
Has many free elctrons
Questão 41
Questão
When compared to a germanium diode, a silicon diode's reverse saturation current is
Responda
-
Equal at high temperatures
-
Lower
-
Equal at lower temperatures
-
Higher
Questão 42
Questão
What causes the depletion layer?
Responda
-
Doping
-
Recombination
-
Barrier potential
-
Ions
Questão 43
Questão
What is the barrier potential of a silicon diode at room temperature?
Responda
-
0.3 V
-
0.7 V
-
1 V
-
2 mV per degree Celsius
Questão 44
Questão
When comparing the energy gap of germanium and silicon atoms, a silicon atom's energy gap is
Responda
-
About the same
-
Lower
-
Higher
-
Unpredictable
Questão 45
Questão
In a silicon diode, the reverse current is usually
Responda
-
Very small
-
Very large
-
Zero
-
In the breakdown region
Questão 46
Questão
While maintaining a constant temperature, a silicon diode has its reverse-bias voltage increased. The diode's saturation current will
Responda
-
Increase
-
Decrease
-
Remain the same
-
Equal its surface-leakage current
Questão 47
Questão
The voltage where avalanche occurs is called the
Responda
-
Barrier potential
-
Depletion layer
-
Knee voltage
-
Breakdown voltage
Questão 48
Questão
The width of a diode's depletion layer will decrease when the diode is
Responda
-
Forward biased
-
First formed
-
Reverse biased
-
Not conducting
Questão 49
Questão
When the reverse voltage decreases from 10 to 5 V, the depletion layer
Responda
-
Becomes smaller
-
Becomes larger
-
Is unaffected
-
Breaks down
Questão 50
Questão
When a diode is forward biased, the recombination of free electrons and holes may produce
Responda
-
Heat
-
Light
-
Radiation
-
All of the above
Questão 51
Questão
A reverse voltage of 10 V is across a diode. What is the voltage across the depletion layer?
Responda
-
0 V
-
0.7 V
-
10 V
-
None of the above
Questão 52
Questão
The energy gap in a silicon atom is the distance between the valence band and the
Responda
-
Nucleus
-
Conduction band
-
Atom's core
-
Positive ions
Questão 53
Questão
The reverse saturation current doubles when the junction temperature increases
Responda
-
1°C
-
2°C
-
4°C
-
10°C
Questão 54
Questão
The surface-leakage current doubles when the reverse voltage increases
Responda
-
7%
-
100%
-
200%
-
2 mV
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