List any two applications of thermionic emission.

List any two applications of thermionic emission.
by

1 Answer

Answer :

1. The components which are made by the process of thermionic emission are used in the electronic devices such as cathode ray tube, radio etc. 

2. Thermionic emission are used in a variety of applications, including high-frequency vacuum transistors for electronics, electron guns for scientific instrumentation, power electronics, x-ray generation, and energy converters from high-temperature sources and solar energy.
by

Related questions

Explain the concept of field emission and give its two applications.

Description : Explain the concept of field emission and give its two applications. 

Last Answer : Concept of field Emission:- Electric field electron emission is the process by which free electrons are emitted from the metal surface when strong electric field is applied. Electric field ... power amplifiers 3. Parallel e-beam lithography tools 4. Electron guns for electron microscopes.

What are the differences between thermionic emission and evaporation?

Description : What are the differences between thermionic emission and evaporation?

Last Answer : Thermionic emission occurs when electron leaves the surface of metals while evaporation occur in liquid when strong electron gain energy and escape the liquid surface in gaseous form

The source of the sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Description : The source of the sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Last Answer : (3) Nuclear fusion Explanation: The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, ... thermonuclear fusion in its core. It is thought that almost all other stars form by this process.

The source of the Sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Description : The source of the Sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Last Answer : (3) Nuclear fusion Explanation: Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter ... fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.

The basic operating principle of a transformer is attributed to ______________. A. electromagnetic induction B. variance of a conductor in a magnetic field C. mutual reaction D. thermionic emission

Description : The basic operating principle of a transformer is attributed to ______________. A. electromagnetic induction B. variance of a conductor in a magnetic field C. mutual reaction D. thermionic emission

Last Answer : Answer: A

The process, whereby electrons gain sufficient energy to be released from the surface of a thin, heated metal plate, is known as _____________. A. photo electric emission B. secondary emission C. thermionic emission D. regressive emission

Description : The process, whereby electrons gain sufficient energy to be released from the surface of a thin, heated metal plate, is known as _____________. A. photo electric emission B. secondary emission C. thermionic emission D. regressive emission

Last Answer : Answer: C

The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Description : The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Last Answer : Answer: D

The phenomenon of nuclear fission is opposite to that of (A) Radioactive decay (B) Thermionic emission (C) Nuclear fusion (D) Combustion

Description : The phenomenon of nuclear fission is opposite to that of (A) Radioactive decay (B) Thermionic emission (C) Nuclear fusion (D) Combustion

Last Answer : (C) Nuclear fusion

The source of the Sun’s energy is the process of (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Description : The source of the Sun’s energy is the process of (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission

Last Answer : Nuclear fusion

Define Thermionic emission.

Description : Define Thermionic emission.

Last Answer : The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called thermionic emission. Thermionic emission occurs in metals that are heated to a very ... of external energy in the form of heat is supplied to the free electrons in the metals.

Thermionic emission occurs in?

Last Answer : Thermionic emission occurs in vacuum tubes.

Explain seekback effect and give its two applications.

Description : Explain seekback effect and give its two applications.

Last Answer : Diagram: Explanation:- Thermoelectric effect also called as seeback effect.  Principle: When two dissimilar metals are connected with each other at their ends a ... thermoelectric generators with the same mechanism but using radioisotopes to generate the required heat difference. 

Explain the concept of piezo-electricity and give its two applications.

Description : Explain the concept of piezo-electricity and give its two applications.

Last Answer : Concept of piezoelectricity:- The phenomenon in which production of polarization, takes place when mechanical stress is applied. Piezoelectricity is a special property of certain material which ... ceramics as oscillators that generate predictable and stable signals at RF (radio frequencies)

State any four applications of micrometers.

Description : State any four applications of micrometers. 

Last Answer : It is used to measure the teeth of gears accurately. This instrument is used to check round work pieces accurately It is also used to check wall thickness of the pipes It is ... It is used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects.

Give any two properties of polymers.

Description : Give any two properties of polymers.

Last Answer : Properties of polymers:- 1. It can be molded. 2. It has ability to soften and even melt.

Give various photoemissive materials and suggest relevant combination of material for LED to emit Yellow and Green colour.

Description : Give various photoemissive materials and suggest relevant combination of material for LED to emit Yellow and Green colour.

Last Answer : Various photoemmisive materials are as follows  Zinc Potassium Lead sulphate Sodium Cadmium sulphide Relevant combination of material for LED to emit Yellow colour  1. Gallium Phosphide(GaP) ... 1. Gallium Phosphide(GaP) 2. Aluminum Gallium Indium Phosphide 3. Aluminum Gallium Phosphide

Explain types of impurity added in a semiconductor with one example each.

Description : Explain types of impurity added in a semiconductor with one example each.

Last 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

Explain the requirements of good insulating material.

Description : Explain the requirements of good insulating material.

Last Answer : Requirement of good insulating material are: i) Electrical ii) Mechanical iii) Thermal iv) Chemical (i) Electrical requirement: A good insulating material should have high resistivity and low ... alkalies. It should not absorb water as water reduces insulation resistance and dielectric strength.

Define intrinsic and extrinsic semiconductor.

Description : Define intrinsic and extrinsic semiconductor. 

Last Answer : Intrinsic – Semiconductor in pure form is called as intrinsic semiconductor. Extrinsic – Semiconductor with added impurity is called as extrinsic semiconductor.

Define Superconductivity.

Description : Define Superconductivity.

Last Answer : Superconductivity is a phenomenon of exactly zero electrical resistance.   OR  The property of zero electrical resistance in some substances at very low absolute temperatures called superconductivity.

Quartz crystal in quartz watches work on the principle called? A. Photoelectric effect B. Stark effect C. Thermionic effect D. Piezo-electric effect (Answer) E. None of these

Description : Quartz crystal in quartz watches work on the principle called? A. Photoelectric effect B. Stark effect C. Thermionic effect D. Piezo-electric effect (Answer) E. None of these

Last Answer : D. Piezo-electric effect (Answer)

The radiation emitted by a body as a result of its temperature.  a. Blackbody Radiation  b. Thermal Inversion  c. Thermionic Inversion  d. Thermal Radiation

Description : The radiation emitted by a body as a result of its temperature.  a. Blackbody Radiation  b. Thermal Inversion  c. Thermionic Inversion  d. Thermal Radiation

Last Answer : Thermal Radiation

A convection process in which an external device, such as a fan, is used to produce the fluid flow.  a. Forced Convection  b. External Convection  c. Placid Convection  d. Thermionic Convection

Description : A convection process in which an external device, such as a fan, is used to produce the fluid flow.  a. Forced Convection  b. External Convection  c. Placid Convection  d. Thermionic Convection

Last Answer : Forced Convection

A circuit which develops voltage across the horizontal deflection plates is known as a) Time base generator b) Electron gun c) Thermionic diode d) Zener diode

Description : A circuit which develops voltage across the horizontal deflection plates is known as a) Time base generator b) Electron gun c) Thermionic diode d) Zener diode

Last Answer : a) Time base generator

The first thermionic valve was invented by (1) Thomas Edison (2) Richardson (3) J.A. Fleming (4) Lee De Forest

Description : The first thermionic valve was invented by (1) Thomas Edison (2) Richardson (3) J.A. Fleming (4) Lee De Forest

Last Answer : J.A. Fleming

List eight ways of reducing pollution. Explain PCV and evaporative emission system with suitable sketch.

Description : List eight ways of reducing pollution. Explain PCV and evaporative emission system with suitable sketch.

Last Answer : Eight ways of reducing pollution:-  1) Optimize Ignition Advance 2) Use unleaded gasoline & Low sulphur diesel 3) Use leaner air fuel ratio 4) Use exhaust gas treatment devices ex Catalytic ... check valve. The EVAP system is designed to limit maximum vacuum and pressure in the fuel tank.