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What are some ferromagnetic materials?

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Description : What is non ferromagnetic materials?

Description : The relative permeability of a ferromagnetic material is?

Answer : The relative permeability of a ferromagnetic material is more than 100 or 1000.

Description : What materials are diamagnetic?

Description : What is the meaning of electrical materials?

Description : What materials are interior doors made of?

Answer : What materials are interior doors made of? The door leaf material is a key component that influences the quality and cost of the door. Interior doors made of walnut or oak look great and ... relevant for office doors, but they are also installed in residential premises if necessary to reduce costs.

Description : Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.

Answer : Those materials are well suited for making permanent magnets which have high retentivity and high coercivity.

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 : What kinds of materials can not electricity pass through?

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 : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Description : State the type of insulating materials under Class Y and Class B.

Answer : The type of insulating materials under Class Y : 1. Cotton  2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos 

Description : List any four materials used for pattern making

Answer : The various types of materials used are as follows: 1. Wood 2. Metal. 3. Plastic. 4. Plaster. 5. Wax.

Description : State factors affecting the life of insulating materials.

Description : Classification of insulating materials as per IS 8504- 1994

Description : State properties of insulating materials.

Answer : (i) Resistivity should be very high. (ii) It should be water resistant. (iii) It should not contain impurities. (iv) It should not be affected chemically and not corroded easily. (v) Its ... It should be mechanically strong (tensile strength should be more). (vii) It should not be porous.

Description : State any four dielectric materials.

Answer : Ceramics, distilled water, paper, mica, polyethylene, and glass. Metal oxides

Description : Classify electrical materials.

Answer : Classification of electrical materials: i) Conducting Materials ii) Insulating materials iii) Magnetic materials iv) Semiconducting materials

Description : Explain the mechanical properties of insulating materials.

Answer : i) Mechanical strength: Mechanical strength depends on temperature and humidity. a) Temperature: High temperature badly affects the mechanical strength of insulating material. While selecting material ... material should have property of easy moulding and machined into required shape and size.

Description : Classify magnetic materials and explain in brief.

Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { ... the absence of external magnetic field. Following are the ferromagnetic materials: Iron, Cobalt, Nickel.

Description : State any four properties of conducting materials.

Answer : Electrical properties of conductivity materials: i) Low resistivity. ii) Low temperature coefficient of resistance. iii) High conductivity. iv) Low heat dissipation.  Mechanical properties of ... properties of conductivity materials: i) Adequate resistant to corrosion. ii) Low oxidation. 

Description : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

Answer : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

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 : Magnetostrictive materials can convert ________ A) Magnetic energy into kinetic energy B) Kinetic energy into magnetic energy C) Both A and B D) None of these

Answer : Magnetostrictive materials can convert ________ A) Magnetic energy into kinetic energy B) Kinetic energy into magnetic energy C) Both A and B D) None of these

Description : The ability of materials to become polarized under an applied electric field is called _______ A) Ferroelectricity B) Paraelectricity C) Polectricity D) None of these

Answer : The ability of materials to become polarized under an applied electric field is called Paraelectricity

Description : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.

Answer : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.

Description : Insulating materials have the function of?

Answer : Insulating materials have the function of preventing an open circuit between the voltage source and the load.

Description : Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.

Description : Define Ferromagnetic materials. Draw B- H Curve.

Answer : Ferromagnetic materials: The materials which possess magnetism in the absence of applied magnetic field is known as ferromagnetic materials.

Description : Define ferromagnetic and ferrimagnetic materials.

Answer : Ferromagnetic materials: The materials which possess magnetism in the absence of applied magnetic field is known as ferromagnetic materials. Example: iron, nickel, cobalt Ferrimagnetic ... a spontaneous magnetization. Example: Magnetite, Ferrous ferrite, Nickel ferrite, Manganese ferrite.

Description : In ferromagnetic, anti -ferromagnetic and ferrimagnetic materials, the atomic thermal motions counteract the coupling forces between the adjacent atomic dipole moments, thereby causing (a) Some dipole misalignment ... on dipole alignment (d) Atoms tend to de -randomize the direction of moments

Answer : In ferromagnetic, anti -ferromagnetic and ferrimagnetic materials, the atomic thermal motions counteract the coupling forces between the adjacent atomic dipole moments, thereby causing Some dipole misalignment regardless of whether an external field is present

Description : The dielectric strength of ferromagnetic materials depends to a large extent on (a) Intensity of electric field (b) Presence of magnetic materials in vicinity (c) Area of hysterisis loop for materials (d) Frequency of applied voltage

Answer : The materials having low retentivity are suitable for making temporary magnets.

Answer : Low resistivity materials are used in transformer, motor and generator windings, transmission and distribution lines, house wiring.

Description : High resistivity materials are used in?

Answer : High resistivity materials are used in precision instruments, heating elements, motor starters, incandescent lamps.

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

Answer : The magnetic materials exhibit the property of magnetisation because of spin of nucleus.

Answer : slightly more than unity

Answer : Materials subjected to rapid reversal of magnetism should have high permeability and low hysteresis loss.

Answer : Effect of moisture on the insulating materials is to decrease dielectric constant, decrease dielectric strength, decrease insulation resistance, increase dielectric loss.

Description : Piezoelectric materials serve as a source of _____ .

Answer : Piezoelectric materials serve as a source of ultrasonic waves.

Description : Name any THREE of the four elements that are ferromagnetic at room temperature (25 degrees Celsius).

Answer : ANSWER: IRON (FE); COBALT (CO); NICKEL (NI); GADOLINIUM GD)

Description : Iron is what type of magnetic material? Is it: w) diamagnetic x) paramagnetic y) ferromagnetic z) non-magnetic

Answer : ANSWER: Y -- FERROMAGNETIC 

Description : The coating on the plastic tape you use in your cassette players is w) diamagnetic x) paramagnetic y) ferromagnetic z) a permanent magnet

Answer : ANSWER: Y -- FERROMAGNETIC

Description : State any two applications of: (i) Ferromagnetic (ii) Paramagnetic material. 

Answer : Applications of Ferromagnetic Materials:  1. In the transformer laminations. 2. In Electrical machines as a magnetic material. 3. In Magnetic poles of motor and generator 4. Magnetic ... : 1. Solid state MASER  2. Using adiabatic demagnetization low temperature can be achieved. 

Description : If a ferromagnetic material is heated upto Curie temperature, it becomes (a) Permanent magnet (b) Anti-ferromagnetic material (c) Diamagnetic material (d) Paramagnetic material 

Description : The phenomenon of magnetostriction occurs when a ferromagnetic substance is magnetized resulting in (a) Heating (b) Small changes in its dimensions (c) Small changes in its crystal structure (d) Some change in its mechanical properties

Answer : The phenomenon of magnetostriction occurs when a ferromagnetic substance is magnetized resulting in Small changes in its dimensions 

Description : When the temperature of a ferromagnetic material exceeds the Curie temperature, it behaves similar to a 

Answer : When the temperature of a ferromagnetic material exceeds the Curie temperature, it behaves similar to a Diamagnetic material

Description : When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as

Answer : When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as Magnetostriction.

Description : What are the two main steps in drying of materials?

Answer : Drying process involves both heat transfer and mass transfer. The steps needed for drying are; i.Heat must be supplied to provide latent heat of vaporization. ii.The liberated vapour must be removed by moving an air stream.

Description : Define ‘Containers’. What are the basic materials used in making of container?

Answer : Containers: A device that holds the drug and it may or may not be in direct contact with the pharmaceutical dosage form or preparations. Basic materials used in making of container: i)Glass ii) Plastic iii) Metal iv) Paper and board

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