Description : What are the number of valence electrons of atoms in semiconductor?
Answer :
There are four valence electrons in the atom of a semiconductor.
asked
Mar 9, 2018
by
anonymous
Description : (i) Explain the process of diffusion in semiconductor material. (ii) Explain Hall effect.
Answer :
(i) Diffusion: In a semi conductor bar a concentration gradient exist when either number of electrons or holes is greater in one region of a semi conductor as compared to other region. When ... to determine whether a semiconductor is N type or P type, and to find carrier concentration
asked
Aug 5, 2019
by
anonymous
Description : State any four materials used in fabrication of semiconductor device and describe its need.
Answer :
For fabrication of semiconductor devices like transistors diode, solar cell etc. we have to make use of following types of materials 1. Substrate: o It is used for deposition of thin ... . o Metal cans and sealed glass containers satisfy the extreme requirements of space and military users.
asked
Aug 5, 2019
by
anonymous
Description : State the impurities for obtaining p-type and n-type semiconductor from intrinsic semi conductor.
Answer :
Crystals of Silicon and Germanium are doped using two types of dopants: 1. The impurities for obtaining n-type semiconductor from intrinsic semiconductor are pentavalent impurity; like Arsenic (As), Antimony ... semiconductor are trivalent impurity; like Indium (In), Boron (B), Aluminum (Al), etc.
asked
Aug 4, 2019
by
anonymous
Description : Which is a semiconductor: copper, silicon, or neon?
Answer :
Copper is a metal. Silicon is a semiconductor. Neon is inert gas.
asked
Jul 1, 2019
by
anonymous
Description : Compare intrinsic and extrinsic semiconductor
Answer :
Intrinsic semiconductor Extrinsic Semiconductor Pure form of semiconductor Impure form of semiconductor No. electrons and holes are equal No. of electrons and holes are not equal Electrical ... e.g. Ge, Si semiconductor e.g. p-type or n-type semiconductor
asked
Sep 5, 2018
by
anonymous
Description : Why is an intrinsic semiconductor doped?
Answer :
Intrinsic semiconductor is doped in order to increase conductivity of semiconductor. Doping increases majority charge carries either electrons or holes and majority charge carriers responsible for electric current.
asked
Sep 4, 2018
by
anonymous
Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal
Answer :
In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero
asked
Jun 18, 2018
by
anonymous
Description : At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because (A) Of drive in diffusion of dopants & carriers. (B) Band to band transition dominates impurity ionization. (C) Impurity ionization dominates band to band transition. (D) Band to band transition is balanced by impurity ionisation.
Answer :
At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because Impurity ionization dominates band to band transition.
asked
Apr 28, 2018
by
anonymous
Description : A snubber circuit is connected to the power semiconductor device to reduce the (A) turn-on time (B) turn-off time (C) electrical stresses (D) thermal resistance
Answer :
A snubber circuit is connected to the power semiconductor device to reduce the electrical stresses
asked
Apr 28, 2018
by
anonymous
Description : The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : (A) higher temperature sensitivity (B) higher Poisson’s ratio (C) higher piezoresitive coefficient (D) higher magnetostrictive coefficient
Answer :
The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : higher piezoresitive coefficient
asked
Apr 26, 2018
by
anonymous
Answer :
Categories of semiconductor components (Integrated circuit families) Integrated circuits are made from semiconductor material These are divided into three main categories A) ... minus, true or false etc. common families include Transistor Transistor Logic (TTL), CMOS, MOSFET.
Answer :
The semiconductor of purest form are called intrinsic semiconductor, (eg. Silicon and germinium) where as semiconductor made up by doping of other semiconductor called extrinsic semiconductor.(again extrinsic semiconductor classified as N type n P type semiconductor)
asked
Sep 18, 2017
by
anonymous
Description : what is the temperature coefficient of Resistance of semiconductor ?
Answer :
semiconductors have negative temperature coefficient of resistance. means as the temperature increases resistance decreases.
Description : What did the first electronic digital computer contain ? (1) Transistors (2) Valves (3) Core memory (4) Semiconductor memory
Answer :
Valves
Description : Some highly refined semiconductor materials is with indium, what will be the majority carrires
Description : Define : (i)Conductor (ii)Semiconductor
Answer :
Conductor: It contains large no. of free electrons at room temperature. the valence band and conduction band overlap with each other. Semiconductor: A substance for which the forbidden energy gap is relatively small than insulator i.e in order of 1 eV.
asked
Sep 4, 2018
by
anonymous
Description : Define (i) Intrinsic semiconductor (ii)Fermi energy level
Answer :
(i) Intrinsic semiconductor: The semiconductor in extremely pure form is called as intrinsic semiconductor. (ii) Fermi energy level : The energy difference between conduction band and valence band is called as fermi energy level.
asked
Sep 4, 2018
by
anonymous
Description : Explain the p-type semiconductor.
Answer :
1) Trivalent impurity is added to a pure semiconductor it is called P-type semiconductor. 2) Some trivalent impurities are gallium , indium ,boron, aluminium etc. These impurities provide large ... )So they are called as majority carriers and electrons are called minority charge carriers.
asked
Sep 4, 2018
by
anonymous
Description : Define the term-Dopant, Extrinsic semiconductor.
Answer :
Dopant: - An element or compound used to dope a semiconductor is called dopant. Extrinsic Semiconductor:- In order to increase current carrying capacity some impurity are added in a semiconductor such semiconductor are called extrinsic Semiconductor.
asked
Sep 4, 2018
by
anonymous
Description : Distinguish between P-type and N-type semiconductor.
Answer :
N- type Semiconductor P- type Semiconductor When small amount of pentavalent impurity is added to a pure semiconductor is called N-type semiconductor When small amount of trivalent impurity ... of electrons The electrons are majority carriers The holes are majority carriers
asked
Sep 4, 2018
by
anonymous
Description : The electrical conductivity of a semiconductor increases with increase in temperature because (a) the carrier concentration increases (b) the mobility of carrier increases (c) both carrier concentration and mobility increase (d) the band gap decreases
Answer :
The electrical conductivity of a semiconductor increases with increase in temperature because the carrier concentration increases
asked
Apr 23, 2018
by
anonymous
Description : A semiconductor device made out of a material having very high temperature coefficient of resistance is
Answer :
A semiconductor device made out of a material having very high temperature coefficient of resistance is Thermistor
asked
Apr 23, 2018
by
anonymous
Description : Dry etching refers to removal of material, typically a masked pattern of semiconductor material, by exposing material to a bombardment of ions which contain (a) Plasma of nitrogen, chlorine and boron trichloride (b) Plasma of sodium, chlorine and boron trichloride (c) Plasma of nitrogen, phosphorous and boron trichloride (d) Plasma of nitrogen, chlorine and boron trioxide
Answer :
Plasma of nitrogen, chlorine and boron trichloride. Other gases include argon and helium.
Description : SiN is used in semiconductor industry such as a diffusion mask during device processing, a dielectric for memory devices because it offers a (a) High breakdown field strength and a low fixed interface charge density. (b) Low breakdown field strength and a high fixed interface charge density. (c) High breakdown field strength and a high fixed interface charge density. (d) Low breakdown field strength and a low fixed interface charge density.
Description : The resistivity of a semiconductor material increases as : (A) The temperature increases (B) The temperature decreases (C) The temperature remains constant (D) None of the above
asked
Apr 14, 2018
by
anonymous
Description : Majority carriers in n type semiconductor are_______. A. Electrons B. Holes C. Both D. None
Answer :
Majority carriers in n type semiconductor are Electrons.
asked
Apr 12, 2018
by
anonymous
Description : An example of semiconductor of electricity is A) Rubber B) Aluminium C) Plastic D) Silicon
asked
Apr 9, 2018
by
anonymous
Description : The new technology which is emerging in the field of computer is (1) IC-technology (2) Parallel processing system (3) Semiconductor technology (4) Transistor technology
Answer :
Transistor technology
Description : When Arsenic atoms are added to Germanium lattice, it becomes a/an (1) Insulator (2) Superconductor (3) Intrinsic semiconductor (4) Extrinsic semiconductor
Answer :
Extrinsic semiconductor
Description : Silicon is a (1) Semiconductor (2) Insulator (3) Nonconductor (4) Conductor
Answer :
Semiconductor
Description : An example of semiconductor is (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic
Answer :
Germanium
Description : Addition of suitable impurities into semiconductor, is called (1) Doping (2) Mixing (3) Forming (4) Diluting
Answer :
Doping
Description : Ohm’s law is valid in case of (1) semiconductor (2) conductor (3) superconductor (4) insulator
Answer :
conductor
Description : Explain types of impurity added in a semiconductor with one example each.
Answer :
There are two types of impurities added in a intrinsic semiconductor which are as follows 1.Donor Impurity 2.Acceptor Impurity 1.Donor Impurity - These are pentavalent which means they have five ... called as Acceptor doping. It is used to manufacture P-type semiconductor Eg:Boron,Gallium,Indium
asked
Jul 14, 2019
by
anonymous
Description : Define intrinsic and extrinsic semiconductor.
Answer :
Intrinsic – Semiconductor in pure form is called as intrinsic semiconductor. Extrinsic – Semiconductor with added impurity is called as extrinsic semiconductor.
asked
Jul 14, 2019
by
anonymous
Description : Semiconductor devices are protected by a fuse and the material used is (A) silver (B) gold (C) copper (D) tin
asked
Jun 4, 2018
by
anonymous
Description : In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: (1) Remains unaltered (2) Moves towards the conduction band (3) Move towards the center of forbidden energy gap (4) May or may not move depending on temperature
Answer :
In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: Moves towards the conduction band
asked
May 29, 2018
by
anonymous
Description : Power Semiconductor device - history
Answer :
Power electronics and converters utilizing them made a head start when the first device the Silicon Controlled Rectifier was proposed by Bell Labs and commercially produced by General Electric in ... IIT, Kharagpur Distributed under Creative Commons Attribution-ShareAlike - CC BY-SA.
asked
May 27, 2018
by
anonymous
Description : Power Semiconductor Devices by Version 2 EE IIT, Kharagpur
Answer :
Introduction This lesson provides the reader the following: (i) Create an awareness of the general nature of Power electronic equipment; (ii) Brief idea about topics of study involved, ... 2 EE IIT, Kharagpur Distributed under Creative Commons Attribution-ShareAlike - CC BY-SA.
asked
May 27, 2018
by
anonymous
Description : In an intrinsic semiconductor the Fermi level is (a) closer to valence band. (b) closer to conduction band. (c) within the balance band. (d) midway between the valence and conduction bands.
asked
May 25, 2018
by
anonymous
Description : At absolute zero temperature, an intrinsic semiconductor behaves as (a) a good conductor (b) a super conductor (c) an insulator (d) variable resistor
asked
May 25, 2018
by
anonymous
Description : Impurity atoms to be added to pure silicon in order to make a p-type semiconductor belongs to (a) Phosphorous (b) Boron (c) Antimony (d) Aluminium
Answer :
Boron , a group three element.
asked
May 25, 2018
by
anonymous
Description : The advantage of a semiconductor strain gauge cover the wire round strain gauge is that
Answer :
The advantage of a semiconductor strain gauge cover the wire round strain gauge is that it is more sensitive
asked
May 17, 2018
by
anonymous
Description : The semiconductor used for LEDs emitting in the visible range is (a) GaAs (b) GaAlAs (c) GalnAs (d) GaAsP
Answer :
The semiconductor used for LEDs emitting in the visible range is GaAsP
asked
May 15, 2018
by
anonymous
Description : The polar bonds existing in III-V compound semiconductor, may be considered as equivalent to (a) 1 ionic bond and 3 covalent bonds (b) 1 ionic bond and 4 covalent bonds (c) 2 ionic bonds and 2 covalent bonds (d) 2 ionic bonds and 4 covalent bonds
Answer :
The polar bonds existing in III-V compound semiconductor, may be considered as equivalent to 1 ionic bond and 3 covalent bonds
asked
May 15, 2018
by
anonymous
Description : The material used for ‘doping’ to prepare N - type semiconductor is
Answer :
The material used for ‘doping’ to prepare N - type semiconductor is Arsenic
asked
May 14, 2018
by
anonymous
Description : While comparing doped semiconductor vs. un-doped semiconductor, which of the following statements is NOT true ? (A) Doped semiconductor has smaller band-gap compared to un-doped semiconductor (B) Doped semiconductor has more carriers as compared to un-doped semiconductor (C) Doped semiconductor has less resistance as compared to un-doped semiconductor (D) Doped as well as un-doped semiconductor have equal bandwidth
Answer :
While comparing doped semiconductor vs. un-doped semiconductor, which of the following statements is NOT true ? (A) Doped semiconductor has smaller band-gap compared to un-doped semiconductor (B) ... to un-doped semiconductor (D) Doped as well as un-doped semiconductor have equal bandwidth
asked
May 12, 2018
by
anonymous
Description : To increase mobility of electron in a given piece of semiconductor (A) Increase overall size of the semiconductor (B) Increase length (C) Increase width (D) Small increase in temperature above room temperature value
Answer :
To increase mobility of electron in a given piece of semiconductor Small increase in temperature above room temperature value
asked
May 12, 2018
by
anonymous
Description : n-type semiconductor can be made by adding ____ to intrinsic semiconductor (A) Boron (B) Arsenic (C) Carbon (D) Germanium
Answer :
n-type semiconductor can be made by adding Arsenic to intrinsic semiconductor
asked
May 12, 2018
by
anonymous