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Amplifiers and Semiconductors

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Using which property, the DC voltages and currents can be produced for the correct operation of the linear circuits involving transistors?

  1. Conductivity

  2. Resistance

  3. Power

  4. Magnetism

  5. Biasing


Correct Option: E
Explanation:

Biasing in electronics is the method of establishing predetermined voltages or currents at various points of an electronic circuit for the purpose of establishing proper operating conditions in electronic components.

Which of the following is a fermion with an intrinsic angular momentum (spin) of half-integer value in units of ħ?

  1. Energy gap

  2. Hole

  3. Electron

  4. Electron-hole pair

  5. Recombination


Correct Option: C
Explanation:

An electron has no known components or substructure. It is generally thought to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton.

Which of the following elements will form the highly complex allotropic diamond with nearly twice the density of graphite at very high pressure ?

  1. Germanium

  2. Tin

  3. Helium

  4. Silicon

  5. Carbon


Correct Option: D
Explanation:

Silicon, a tetravalent metalloid, is a chemical element with the symbol Si and atomic number 14. It is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid directly below it in the table.

Extrinsic semiconductors are the pure semiconductors that have been altered by the presence of:

  1. holes

  2. dopants

  3. power

  4. electrons

  5. transistor


Correct Option: B
Explanation:

A dopant, also called a doping agent, is a trace impurity element that is inserted into a substance (in very low concentrations) in order to alter the electrical properties or the optical properties of the substance.

In very high speed applications, which metal is used to reduce heat from friction during rolling to avoid problems in metal bearings?

  1. Carbon

  2. Tin

  3. Mica

  4. Argon

  5. Ceramic


Correct Option: E
Explanation:

A ceramic is an inorganic, nonmetallic solid prepared by the action of heat and subsequent cooling. Ceramic materials may have a crystalline or partly crystalline structure, or may be amorphous (e.g., a glass).

Which of the following factors affect the power gain depending on the source,load impedances used and its voltage gain?

  1. Conductivity

  2. Resistance

  3. Electrical impedance

  4. Amplification

  5. Transistivity


Correct Option: D
Explanation:

An electronic amplifier, amplifier, or (informally) amp is an electronic device that increases the power of a signal.

Which of the following is used as a dopant in the semiconductor industry in it's elemental form?

  1. Neon

  2. Carbon

  3. Boron

  4. Gallium

  5. hydrogen


Correct Option: C
Explanation:

Boron is a chemical element with symbol B and atomic number 5. Because boron is produced entirely by cosmic ray spallation and not by stellar nucleosynthesis, it is a low-abundance element in both the solar system and the Earth's crust.

In very pure state, which metal has a brilliant silvery colour and its solid metal fractures conchoidally like glass?

  1. Neon

  2. Carbon

  3. Boron

  4. Gallium

  5. Arsenic


Correct Option: D
Explanation:

Gallium is a chemical element with symbol Ga and atomic number 31. Elemental gallium does not occur in nature but as gallium compounds in trace amounts in bauxite and zinc ores.

Which of the folowing possesses an ability to control a very large signal on one of its terminals by using a small signal applied between another pair of terminals?

  1. Insulators

  2. Dopants

  3. Semiconductors

  4. Conductors

  5. Transistors


Correct Option: E
Explanation:

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.

In which of the following an electric current can pass in one direction, while it gets blocked in the opposite direction?

  1. TV

  2. Diode

  3. Transistor

  4. TRIAC

  5. Resistor


Correct Option: B
Explanation:

In electronics, a diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction and high (ideally infinite) resistance in the other.

Historically, the first decade of semiconductor electronics were entirely based on which element?

  1. Germanium

  2. Tin

  3. Helium

  4. Boron

  5. Carbon


Correct Option: A
Explanation:

Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors, tin and silicon.

During cosmic nucleogenesis of the elements, which element gets built up in large amounts from the alpha-capture fusion process in stars?

  1. Gallium

  2. Carbon

  3. Boron

  4. Neon

  5. Arsenic


Correct Option: D
Explanation:

Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 of the periodic table. Neon is a colorless, odorless monatomic gas under standard conditions, with about two-thirds the density of air.

In which of the following the dominant carrier concentrations classify it as either n-type or p-type semiconductor?

  1. semiconductor

  2. extrinsic semiconductor

  3. intrinsic semiconductors

  4. super conductors

  5. doping


Correct Option: B
Explanation:

extrinsic semiconductors decide whether the conductor is p type or n type 

Which of the following is commonly used as a flexible coating on electric wires and cables?

  1. Insulator

  2. Resistor

  3. Semiconductor

  4. Conductor

  5. Transistor


Correct Option: A
Explanation:

An electrical insulator is a material whose internal electric charges do not flow freely, and which therefore does not conduct an electric current under the influence of an electric field.

In solid-state electronics, which of the following can be used in proper type and amount to produce p-type semiconductors and n-type semiconductors that are essential for making transistors and diodes?

  1. Power

  2. Pressure

  3. Dopants

  4. Forward bias

  5. Heat


Correct Option: C
Explanation:

A dopant, also called a doping agent, is a trace impurity element that is inserted into a substance (in very low concentrations) in order to alter the electrical properties or the optical properties of the substance.

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