Test
Chapter 2
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Preguntas del test (54)
1The nucleus of a copper atom contains how many protons?
- A1
- B4
- C18
- D29
2The net charge of a neutral copper atom is
- A0
- B+1
- C-1
- D+4
3Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
- A0
- B+1
- C-1
- D+4
4The valence electron of a copper atom experiences what kind of attraction toward the nucleus ?
- ANone
- BWeak
- CStrong
- DImpossible to say
5How many valence electrons does a silicon atom have?
- A0
- B1
- C2
- D4
6Which is the most widely used semiconductor?
- ACopper
- BGermanium
- CSilicon
- DNone of the above
7How many protons does the nucleus of a silicon atom contain?
- A4
- B14
- C29
- D32
8Silicon atoms combine into an orderly pattern called a
- ACovalent bond
- BCrystal
- CSemiconductor
- DValence orbit
9An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
- ADoping
- BFree electrons
- CThermal energy
- DValence electrons
10When an electron is moved to a higher orbit level, its energy level with respect to the nucleus
- AIncreases
- BDecreases
- CRemains the same
- DDepends on the type of atom
11The merging of a free electron and a hole is called
- ACovalent bonding
- BLifetime
- CRecombination
- DThermal energy
12At room temperature, an intrinsic silicon crystal acts approximately like
- AA battery
- BA conductor
- CAn insulator
- DA piece of copper wire
13The amount of time between the creation of a hole and its disappearance is called
- ADoping
- BLifetime
- CRecombination
- DValence
14The valence electron of a conductor can also be called a
- ABound electron
- BFree electron
- CNucleus
- DProton
15A conductor has how many types of flow?
- A1
- B2
- C3
- D4
16A semiconductor has how many types of flow?
- A1
- B2
- C3
- D4
17When a voltage is applied to a semiconductor, holes will flow
- AAway from the negative potential
- BToward the positive potential
- CIn the external circuit
- DNone of the above
18For semiconductor material, its valence orbit is saturated when it contains
- AOne electron
- BEqual (+) and (-) ions
- CFour electrons
- DEight electrons
19In an intrinsic semiconductor, the number of holes
- AEquals the number of free electrons
- BIs greater than the number of free electrons
- CIs less than the number of free electrons
- DNone of the above
20Absolute zero temperature equals
- A-273 °C
- B0 °C
- C25 °C
- D50 °C
21At absolute zero temperature, an intrinsic semiconductor has
- AA few free electrons
- BMany holes
- CMany free electrons
- DNo holes or free electrons
22At room temperature, an intrinsic semiconductor has
- AA few free electrons and holes
- BMany holes
- CMany free electrons
- DNo holes
23The number of free electrons and holes in an intrinsic semiconductor decreases when the temperature
- ADecreases
- BIncreases
- CStays the same
- DNone of the above
24The flow of valence electrons to the right means that holes are flowing to the
- ALeft
- BRight
- CEither way
- DNone of the above
25Holes act like
- AAtoms
- BCrystals
- CNegative charges
- DPositive charges
26Trivalent atoms have how many valence electrons?
- A1
- B3
- C4
- D5
27An acceptor atom has how many valence electrons?
- A1
- B3
- C4
- D5
28If you wanted to produce a p-type semiconductor, which of these would you use?
- AAcceptor atoms
- BDonor atoms
- CPentavalent impurity
- DSilicon
29Electrons are the minority carriers in which type of semiconductor?
- AExtrinsic
- BIntrinsic
- Cn-type
- Dp-type
30How many free electrons does a p-type semiconductor contain?
- AMany
- BNone
- COnly those produced by thermal energy
- DSame number as holes
31Silver is the best conductor. How many valence electrons do you think it has?
- A1
- B4
- C18
- D29
32Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature drops to 0°C, how many holes are there?
- AFewer than 1 billion
- B1 billion
- CMore than 1 billion
- DImpossible to say
33An 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?
- ALeft
- BRight
- CNeither
- DImpossible to say
34Which of the following doesn't fit in the group?
- AConductor
- BSemiconductor
- CFour valence electrons
- DCrystal structure
35Which of the following is approximately equal to room temperature?
- A0°C
- B25°C
- C50°C
- D75°C
36How many electrons are there in the valence orbit of a silicon atom within a crystal?
- A1
- B4
- C8
- D14
37Negative ions are atoms that have
- AGained a proton
- BLost a proton
- CGained an electron
- DLost an electron
38Which of the following describes an n-type semiconductor?
- ANeutral
- BPositively charged
- CNegatively charged
- DHas many holes
39A p-type semiconductor contains holes an
- APositive ions
- BNegative ions
- CPentavalent atoms
- DDonor atoms
40Which of the following describes a p-type semiconductor?
- ANeutral
- BPositively charged
- CNegatively charged
- DHas many free elctrons
41When compared to a germanium diode, a silicon diode's reverse saturation current is
- AEqual at high temperatures
- BLower
- CEqual at lower temperatures
- DHigher
42What causes the depletion layer?
- ADoping
- BRecombination
- CBarrier potential
- DIons
43What is the barrier potential of a silicon diode at room temperature?
- A0.3 V
- B0.7 V
- C1 V
- D2 mV per degree Celsius
44When comparing the energy gap of germanium and silicon atoms, a silicon atom's energy gap is
- AAbout the same
- BLower
- CHigher
- DUnpredictable
45In a silicon diode, the reverse current is usually
- AVery small
- BVery large
- CZero
- DIn the breakdown region
46While maintaining a constant temperature, a silicon diode has its reverse-bias voltage increased. The diode's saturation current will
- AIncrease
- BDecrease
- CRemain the same
- DEqual its surface-leakage current
47The voltage where avalanche occurs is called the
- ABarrier potential
- BDepletion layer
- CKnee voltage
- DBreakdown voltage
48The width of a diode's depletion layer will decrease when the diode is
- AForward biased
- BFirst formed
- CReverse biased
- DNot conducting
49When the reverse voltage decreases from 10 to 5 V, the depletion layer
- ABecomes smaller
- BBecomes larger
- CIs unaffected
- DBreaks down
50When a diode is forward biased, the recombination of free electrons and holes may produce
- AHeat
- BLight
- CRadiation
- DAll of the above
51A reverse voltage of 10 V is across a diode. What is the voltage across the depletion layer?
- A0 V
- B0.7 V
- C10 V
- DNone of the above
52The energy gap in a silicon atom is the distance between the valence band and the
- ANucleus
- BConduction band
- CAtom's core
- DPositive ions
53The reverse saturation current doubles when the junction temperature increases
- A1°C
- B2°C
- C4°C
- D10°C
54The surface-leakage current doubles when the reverse voltage increases
- A7%
- B100%
- C200%
- D2 mV
Información
- Descripción
- semiconductors
- Autor
- Katrina Himes
- Idioma
- English
- Visitas
- 345
- Etiquetas
- Valoración
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