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What materials are diamagnetic?

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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.

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Description : Magnetic and Non-magnetic Materials

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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

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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.

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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

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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

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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.

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

Answer : ANSWER: Y -- FERROMAGNETIC 

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 : 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 : The permeability of a diamagnetic material is  1. Zero 2. Less than 1 3. Equal to 1 4. More than 1

Answer : The permeability of a diamagnetic material is Less than 1

Description : Susceptibility of a diamagnetic material is 1. Negative 2. Positive 3. Dependent on the temperature 4. Independent of the temperature  Select the correct answer using the codes given below : (a) 1 and 3 only (b) 2 and 3 only (c) 1 and 4 only (d) 2 and 4 only

Answer : Susceptibility of a diamagnetic material is 1. Negative 2. Positive 3. Dependent on the temperature 4. Independent of the temperature  Select the correct answer using the codes given below : (a) 1 and 3 only (b) 2 and 3 only (c) 1 and 4 only (d) 2 and 4 only

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Description : What are the properties of sound insulating materials?

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Description : What paintwork materials are used in construction?

Answer : What paintwork materials are used in construction? Whatever the building material, it needs protection from external factors. Whether it be wood, concrete or metal, it doesn't matter. The ... plastered surfaces. Silicate paints are also capable of imparting good fire resistance to wood.  

Description : Considering that all behaviour occurs in context, what is the possible source of behaviour of a child who refuses to interact with the teacher and peers all the time? Options: A) Materials being ... The child has been rejected or ridiculed by parents and adults D) The child does not understand

Answer : C) The child has been rejected or ridiculed by parents and adults 

Answer : Temporary magnets are used in loud-speakers,generators, motors.

Answer : Main causes of noisy solenoid are strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force, uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts.

Description : Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

Answer : Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be 0.1 N.

Answer : When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle will depend on the radius of the circle.

Answer : Ferrites are a sub-group of ferri-magnetic materials.

Answer : Substances which have permeability less than the permeability of free space are known as diamagnetic.

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