Description : Read the following paragraph and answer the questions: LED is a heavily doped P-N junction which under forward bias emits spontaneous radiation. When it is forward biased, due to recombination of holes and ... -I characteristic of a p-n junction diode in (i) forward bias and (ii) reverse bias
Description : In a p–type semiconductor, the concentration of holes is 2 x 1015 cm-3. The intrinsic carrier concentration is 2 x 1010 cm-3. The concentration of electrons will be. (1) 1 x 105 cm-3 (2) 2 x 105 cm-3 (3) 2 x 1015 cm-3 (4) 2 x 1020 cm-3
Description : In an intrinsic semiconductors number density of electrons and holes is same and is n. The relaxation time of electrons and holes is \(\tau_e\) and \(\tau_h\) respectively. As temperature of semiconductor rises its ... in n is much more than the effect of decrease in \(\tau_e\) and \(\tau_b\) .
Description : Pure Si and 500 K has an equal number of electron and holes of concentration 1.5 x 1016 . Doping by indium increases hole concentration (nh) to 4.5 x 1022 m-3. The doped semiconductor is (1) n-type; ... electron concentration of 2.5 x 1023 m-3 (4) p-type; with electron concentration of 5 x 109 m-3
Description : What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes?
Last Answer : Intrinsic.
Description : The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes
Last Answer : (a) Minority carrier
Description : In the N-type semiconductor the charge carries are a) Holes b) Neutrons c) Protons d) Electrons
Last Answer : d) Electrons
Description : In a P-type semiconductor the charge carriers are a) Electrons b) Holes c) Protons d) Neutrons
Last Answer : b) Holes
Description : Addition of trivalent impurity to a semiconductor creates many (A) holes. (B) free electrons. (C) valance electrons. (D) bound electrons.
Last Answer : (B) free electrons.
Description : In p-type semiconductor the majority carriers are (A) holes. (B) electrons. (C) positive ions. (D) negative ions.
Last Answer : (A) holes.
Description : A P-type semiconductor is doped to produce one of the following. Will it produce: w) both holes and electrons x) positive electrons y) negative electrons z) holes
Last Answer : ANSWER: Z -- HOLES
Description : Some highly refined semiconductor materials is with indium, what will be the majority carrires
Description : n-type semiconductor can be made by adding ____ to intrinsic semiconductor (A) Boron (B) Arsenic (C) Carbon (D) Germanium
Last Answer : n-type semiconductor can be made by adding Arsenic to intrinsic semiconductor
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
Last Answer : A snubber circuit is connected to the power semiconductor device to reduce the electrical stresses
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
Last Answer : The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : higher piezoresitive coefficient
Description : When the temperature of a doped semiconductor is increased, its conductivity (1) Decreases (2) Increases (3) Does not change (4) Increases or decreases depending on whether it is p-type or n-type
Last Answer : When the temperature of a doped semiconductor is increased, its conductivity Increases.
Description : Which of the following semiconductor materials is (are) used for manufacturing solar cells? (1) Gallium arsenide (2) Indium arsenide (3) Cadmium sulfide (4) All of these
Last Answer : All of these.
Description : For Gunn diodes, semiconductor material preferred is (a) Silicon (b) Germanium (c) Gallium Arsenide (d) all of these
Description : When Aluminium is deposited directly upon N type semiconductor, the diode formed has the characteristic A) Forward current due to minority carriers B) Small delay time from on to off C) Large storage time D) Higher break down voltage
Description : Semiconductor A has a higher band gap than semiconductor B. If both A and B have the same dimensions, the same number of electrons at a given temperature and the same electron and hole mobilities, then
Last Answer : In a P type semiconductor At room temperature the hole concentration equals the acceptor concentration
Last Answer : Avalanche break down in a semiconductor diode occurs when Reverse bias exceeds a certain value
Last 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.
Description : An electric field of 40 V cm-1 is applied to a semiconductor crystal. A small amount of minority carriers are also injected into the crystal at one point. Due to the electric field, minority carriers move a through a distance of 2 ... 1000 cm2 V-1 sec-1 (3) 1250 cm2 V-1 sec-1 (4) 2500 cm2 V-1 sec-1
Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?
Last Answer : The electrons become immobile.
Description : What is the spherical boundary of zero thickness in which photons that move around black holes called? -Space
Last Answer : A photon sphere or photon circle is an area or region of space where gravity is so strong that photons are forced to travel in orbits. (It is sometimes called the last photon orbit.) The radius of ... sphere, which is also the lower bound for any stable orbit, is, for a Schwarzschild black hole:
Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.
Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation
Description : Conduction band electrons have more mobility than holes because they (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them
Last Answer : experience collision less frequently