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what is semiconductor ?
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For simple understanding is that the semiconductor is a  partially conductor and partially insulator which depends on the temperature of conductor.
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Description :

What are the number of valence electrons of atoms in semiconductor?

Answer :

There are four valence electrons in the atom of a semiconductor.

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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

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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.

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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.

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Description :

Which is a semiconductor: copper, silicon, or neon?

Answer :

Copper is a metal. Silicon is a semiconductor. Neon is inert gas.

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2.7k views 1 answer
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

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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. 

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61 views 1 answer
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 

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164 views 1 answer
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.

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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

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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

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317 views 1 answer
Description :

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.

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Description :

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) 

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53 views 1 answer
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.

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Description :

What did the first electronic digital computer contain ? (1) Transistors (2) Valves (3) Core memory (4) Semiconductor memory

Answer :

Valves

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Description :

Some highly refined semiconductor materials is  with indium, what will be the majority carrires

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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.

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42 views 1 answer
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.

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54 views 1 answer
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.

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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. 

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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

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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

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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

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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.

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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.

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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

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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.

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Description :

An example of semiconductor of electricity is  A) Rubber B) Aluminium C) Plastic D) Silicon 

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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

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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

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Description :

Silicon is a (1) Semiconductor (2) Insulator (3) Nonconductor (4) Conductor

Answer :

Semiconductor

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Description :

An example of semiconductor is (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic

Answer :

Germanium

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Description :

Addition of suitable impurities into semiconductor, is called (1) Doping (2) Mixing (3) Forming (4) Diluting

Answer :

Doping

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Description :

Ohm’s law is valid in case of (1) semiconductor (2) conductor (3) superconductor (4) insulator

Answer :

conductor

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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

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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.

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Description :

Semiconductor devices are protected by a fuse and the material used is (A) silver (B) gold (C) copper (D) tin 

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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

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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.

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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.

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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. 

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Description :

At absolute zero temperature, an intrinsic semiconductor behaves as (a) a good conductor (b) a super conductor (c) an insulator (d) variable resistor

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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.

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124 views 1 answer
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

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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

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63 views 1 answer
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

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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

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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

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50 views 1 answer
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

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55 views 1 answer
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

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50 views 1 answer
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