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What materials are diamagnetic?
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What are some ferromagnetic materials?

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What is non ferromagnetic materials?

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What is the meaning of electrical materials?

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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.

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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.

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What kinds of materials can not electricity pass through?

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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.

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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.

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Description :

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

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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 

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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.

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State factors affecting the life of insulating materials.

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Classification of insulating materials as per IS 8504- 1994

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State properties of insulating materials.

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(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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State any four dielectric materials.

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

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Classify electrical materials.

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

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Explain the mechanical properties of insulating materials.

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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.

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Classify magnetic materials and explain in brief.

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.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.

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State any four properties of conducting materials.

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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. 

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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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_______ 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. 

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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

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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

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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.

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Insulating materials have the function of?

Answer :

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

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

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Answer :

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

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Answer :

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

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High resistivity materials are used in?

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

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

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Answer :

slightly more than unity

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

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

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Piezoelectric materials serve as a source of _____ .

Answer :

Piezoelectric materials serve as a source of ultrasonic waves.

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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

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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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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 learnt are too simple or too challenging B) The child has a fight with the parents C) 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 

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Description :

Define forgeability. Name any two materials that are used in forging. 

Answer :

Forgeability: Forgeability can be defined as the tolerance of a metal or alloy for deformation without failure. OR  Forgeability is defined as the ability of a metal to change size and shape when heated to ... 10) Tantalum alloys 11) Molybdenum alloys 12) Tungsten alloys 13) Beryllium.

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Teaching on TV is superior to class room instruction because Options: A) very large classes are made possible and thus it is economically advantageous B) experts for teaching a difficult topic can be arranged and others can be benefited from them C) teaching materials can be filmed for reuse D) all of these

Answer :

D) all of these 

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1. Which of light are strongly absorbed by plants? 2. Higher than Hopes' is a biography of which author? 3. How many languages are used on a ten rupee note? 4. Which are the materials that come out of a volcano at the time of eruption? 5. Which ruler from Central Asia conquered North India in 1192? 6. What ... whom is this? 18. Which State produces maximum pulses in the country? 19. Which is the World's longest river? 20. In which two seets was Jainism divided into?

Answer :

Answer : 1. Blue and red 2. Nelson Mandela 3. 15 4. Solid, liquid, gaseous 5. Shihabuddin Muhammad Gori 6. Fumaric acid 7. Advocate General 8. Vitamin D 9. Andes 10. Amir Khusarau 11. ... 16. The Council of Ministers 17. Bernoulli's principle 18. Madhya Pradesh 19. Nile 20. Svetambara and Digambara

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1. By which algae is Nitrogen fixation done? 2. Which post does the Constitution of India not mention? 3. When do all the magnetic materials lose their magnetic properties? 4. Why are the Canals in Western Europeare mainly used? 5. By whom was the Tahglq-i-Hind', a famous literary work, written? ... How the Constitution describes India? 19. The Himalayan mountain system belongs to which mountains? 20. During the reign of emperor was the artillery most perfect and numerous?

Answer :

Answer : 1. Blue-green algae 2. The Deputy Prime Minister 3. Strongly heated 4. For inland navigation 5. Alberuni 6. 5th June 7. Manipur 8. Analogous organs 9. Oxbow lake 10. Vallabhacharya 11 ... 17. Due to presence of Bacteriophages 18. As a Union of States 19. Fold mountains 20. Aurangzeb

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Description :

Deep fried food materials are carcinogenic because they are rich in (1) Fats (2) Hydrocarbons (3) Cooking oil (4) Nicotine

Answer :

Hydrocarbons

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Description :

Raw materials used for the manufacture of glass are (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda 

Answer :

sand, soda, limestone

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For generation of biogas, the materials commonly used are (1) Animal wastes (2) Crop residues (3) Aquatic plants (4) Forest residues

Answer :

Animal wastes

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Description :

In an economy, the sectors are classified into public and private on the basis of (1) employment conditions (2) nature of economic activities (3) ownership of enterprises (4) use of raw materials

Answer :

 ownership of enterprises 

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In a business, raw materials, components, work in progress and finished goods are jointly regarded as (1) capital stock (2)inventory (3) investment (4)net worth

Answer :

inventory

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Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core cable. The materials on inner most and outer most layer respectively should be (a) X and Y (b) Y and Z (c) X and Z (d) Z and X 

Answer :

Answer is option d Because the material with high relative permitivity should be used as the inner most layer of the cable,to withstand with the  high currents flowing in the conductor 

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Description :

Materials with lots of free electrons are called? A.conductors B.insulators C.semiconductors D.filters

Answer :

Materials with lots of free electrons are called? A.conductors B.insulators C.semiconductors D.filters

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Materials having a high dielectric constant, which is non-linear are known as (a) Super dielectrics (b) Elastomers (c) Ferromagnetics (d) Hard dielectrics

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Magnetic materials used in Hard disc, Floppy disc are (a) NiCo, CuNiFe, Cr02, Fe203 (b) NiCo, CNiFe, Cr02, Fe2O3 (c) NiCu, CuNiFe, Cr02, Fe203 (d) NiCo, CuNiFe, Cr02, Fe202

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Materials used in plate earthing are   (a) Wood coal  (b) Salt, earthing plate   (c) (a) and (b) both  (d) None of the above 

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