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Yes, Induction heating is used for both magnetic and non-magnetic materials.

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Description : Enlist any four advantages of induction heating. 

Answer : Advantages of Induction heating https://youtu.be/RcdH_74VJz0

Description : The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

Answer : The range of frequencies used in induction heating is : more than 1 kHz

Description : Is induction heating safe?

Description : State the material used for making (1) Magnetic Core (2) Fuse element  

Answer : The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

Description : A material for good magnetic memory should have?

Answer : A material for good magnetic memory should have high retentivity.

Description : The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

Answer : The magnetic susceptibility of paramagnetic material is: Less than one but positive

Description : The property of a material which opposes the creation of magnetic flux in it is known as?

Answer : The property of a material which opposes the creation of magnetic flux in it is known as reluctance.

Description : In a magnetic material hysteresis loss takes place primarily due to?

Answer : In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

Description : Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

Description : Electro Magnetic Induction

Answer : Electro Magnetic Induction

Description : _______ is used for heating non -conducting materials.  (1) Eddy current heating (2) Arc heating (3) Induction heating (4) Dielectric heating

Answer : Dielectric heating is used for heating non -conducting materials. 

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

Description : State advantages of electric heating over other types of heating methods.

Answer : Advantages of Electric heating over the other types of heating methods: 1. It can be put into service immediately. 2. No standby losses. 3. High efficiency. 4. More economical ... low attention and supervision. 14. Protection against overheating can be provided by suitable switch gear. 

Answer : To avoid the effect of stray magnetic field in A.C. bridges we can use magnetic screening.

Description : Two non -inverting amplifiers, one having a unity gain and the other having again of twenty are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain twenty has

Answer : Two non -inverting amplifiers, one having a unity gain and the other having again of twenty are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain twenty has less bandwidth

Description : The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V

Answer : The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV

Description : Measurement of a non -electrical quantity involves the following four subsystems:  a) amplifier block b) display block c) instrumentation block d) transducer block  The correct, sequence in which these block occur is  (1) d,a,c,b (2) d, c, a, b (3) a, c, b, d (4) a, b, c, d

Answer : Measurement of a non -electrical quantity involves the following four subsystems:  a) amplifier block b) display block c) instrumentation block d) transducer block  The correct, sequence in which these block occur is d,a,c,b

Description : What is a non linear load?

Description : Why do non linear loads cause harmonics?

Description : How to install autonomous heating?

Answer : Autonomous heating and hot water supply is gaining popularity and is used not only in winter, but also in summer. The reason for this, as a rule, is large bills from utilities, as well as the ... a boiler, you should not save on the reliability of the boiler, on control equipment and on service.

Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

Description : What is meant by resistance heating?

Description : What is meant by dielectric heating?

Description : Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

Answer : Magnetic circuit breakers use Solenoid 

Description : Magnetic and Non-magnetic Materials

Answer : We have now looked at a number of ways in which matter can be grouped, such as into metals, semi-metals and non-metals; electrical conductors and insulators, and thermal conductors and insulators. ... information must be stored, in computers and TV's, as well as in generators and electric motors.

Description : Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

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Description : State the material used for moving coil and former for PMMC instruments. 

Answer : Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

Description : For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above 

Description : State properties of conductor material used for overhead conductor. 

Answer : Following are the properties of conductor material:-   1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value. 

Description : Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

Description : Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

Answer : Those magnetic materials are best suited for making armature and transformer cores which have high permeability and low hystersis loss.

Description : Derive an expression for energy stored in a magnetic field . 

Answer : Expression for energy stored in a magnetic field: The energy is stored in magnetic field when current increases and return back when the current decreases. At instant t' seconds after closer of switch ... energy absorbed by the magnetic field when current increases from 0 to I amperes 

Description : Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.

Answer : Magnetic linens of force is the imaginary lines for magnetic field of magnet around it. These magnetic lines of forces are introduced by Michael Faraday. The direction of lines of force is from N-pole to S-pole. The figure shows lines of force for bar type magnet.

Description : What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Answer : What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Description : How can a magnetic field be used to generate an electric current?

Answer : Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

Description : State gaseous and liquid insulating material.

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Description : List four examples of insulating material and explain any two.

Answer : Examples of insulating materials:  i) Solid: Ceramic, Porcelain, Mica, Glass, Rubber, Resinous, Fibers  ii) Liquid: Synthetic, Mineral etc.  iii) Gaseous: Hydrogen, Air, ... and low hygroscopicity.  Uses: Insulation in electric field, transformer stampings, armature, pole stampings

Description : State function of Busbar and which material is used for busbar?

Answer : Function of Busbar Bus-bar: - Distribute the load on 3-phase four wire systems. To provide number of connection of incoming line and to provide easy way to connect number of sub circuit. ... to the element. This element means busbar Material is used for busbar: 1. Copper 2. Alluminium

Description : State the four major parts of Transformer and material used for their construction.

Description : how can we reverse the direction of rotation of three phase induction motor ?

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Description : An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

Answer : An induction type energy meter is found to run fast. Correction for this error can be made by Moving the brake magnet away from the centre of the disc.

Answer : An induction wattmeter can be used for A.C. 

Description : State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. 

Answer :  (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C 

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

Description : What is piezoelectric effect? Name two piezoelectric material.

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Description : Based on temperature withstanding ability, classify insulating material. 

Answer : class Temperature withstanding ability in 0C Materials Y 90 Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC. A 105 ... rubber compounds C Above 180  Mica, ceramics, glass, Teflon, quartz, etc. 

Description : What is amorphous metal material? Give any three properties of amorphous metal.

Answer : Amorphous metal: The amorphous is metal alloy which differ in crystalline structure. The atoms are arranged in random configuration.  Properties of amorphous metal: 1) Thermal conductivity of ... . 6) The alloy does not undergo shrinkage on solidification, which helps in bones attachments.

Description : What is dielectric strength of an insulating material? What is its unit?

Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

Description : What are insulating material?

Answer : Insulating material: Insulating material is that which offers very high resistance to the flow of current through it.

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