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