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You need to login to ask any Questions from chapter magnetic-properties-of-material-electrical-properties-of-materials-plastics-ceramics-and-composites of Manufacturing-engineering-I

Chapter:

magnetic-properties-of-material-electrical-properties-of-materials-plastics-ceramics-and-composites

1. With an increase in mean free path of electrons, materials conductivity ________

increases decreases remains constant first increases and then decreases

increases

Conductivity of a material increases with an increase in mean free path of electrons. Mean free path is nothing but average distance travelled by an electron between two successive collisions.

Hint Answer

2. With an increase in area of hysteresis curve, power loss will _______

Increases Decreases First decreases and then increases First increases and then decreases

Increases

Power loss is directly proportional to area of hysteresis curve.

Hint Answer

3. Which of following is a primary bond network of rmosetting plastics?

1-Dimensional 3-Dimensional 2-Dimensional 0-Dimensional

3-Dimensional

Thermosetting plastics have a three-dimensional network of ?1-degree? primary bond.

Hint Answer

4. What is resistivity of iron (in Ohm-m) at room temperature?

9.71 × 10^-2 9.71 × 10^-8 9.71 × 10^-5 9.71 × 10^-9

9.71 × 10^-8

Iron has medium conductivity. The resistivity of iron is 9.71 � 10^-8 ?-m.

Hint Answer

5. For a paramagnetic material, which of following statement is correct (μ_r = relative permeability)?

μ_r = 0 μ_r < 1 μ_r > 1 μ_r < 0

μ_r > 1

A paramagnetic material has a constant relative permeability (?r) slightly greater than 1.

Hint Answer

6. Thermoplastics have _________

1-Degree bond 2-Degree bond 3-Degree bond 0-Degree bond

2-Degree bond

A rmoplastic is a polymer which gets softened when heated. They have a one-dimensional network of ?2-degree? secondary bond. A well-known example of this kind are PET (polyethylene terephthalate), PVC (polyvinyl chloride), and PP (polypropylene) etc.

Hint Answer

7. The polymerization of two or more chemically different monomers forming a long molecular chain is termed as ________

addition polymerization copolymerization condensation polymerization chain growth polymerization

copolymerization

Copolymerization involves polymerization of two or more different monomers to form a long chain molecule. A well-known ?Nylon 66? is a copolymer of hexamethylenediamine and adipic acid.

Hint Answer

8. Magnetic Bubbles are used as ______

Storage device Strain gauge Thermostat Potentiometer

Storage device

Magnetic bubbles are small magnetized areas used as storage devices (data bites). One good thing about magnetic bubbles are y do not disappear when power is turned off.

Hint Answer

9. Thermosetting plastics have ________

1-Degree bond 2-Degree bond 3-Degree bond 0-Degree bond

1-Degree bond

A rmosetting plastic is a polymer which gets irreversibly hardened when heated. They have a three-dimensional network of ?1-degree? primary bond. A well-known example of this kind are bakelite, polyester and epoxy resin, etc.

Hint Answer

10. What is energy gap (Eg) of an insulator?

E_g < 3 ev E_g < 1 ev E_g < 0 ev E_g > 3 ev

E_g > 3 ev

The energy gap (Eg) of an insulator is approximately equal to 15 ev.

Hint Answer

Nexttt

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Magnetic Properties of Material, Electrical Properties of Materials, Plastics, Ceramics and Composites

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Metal Cutting

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Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

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Milling, Drilling and Reaming

Milling, Drilling and Reaming

Grinding, Surface Finishing Operations and Unconventional Machining Processes

Grinding, Surface Finishing Operations and Unconventional Machining Processes

Metrology, Welding, Fusion-Welding Processes and Unconventional Welding Methods

Metrology, Welding, Fusion-Welding Processes and Unconventional Welding Methods

Powder Metallurgy, NC Part Programming and Metal Casting and Gating Systems

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Forming, Metal Forming Processes and Heat Transfer

Forming, Metal Forming Processes and Heat Transfer

Jigs and Fixture, Applications and Gears

Jigs and Fixture, Applications and Gears

Topics

This Chapter magnetic-properties-of-material-electrical-properties-of-materials-plastics-ceramics-and-composites consists of the following topics

Magnetic Properties of Material

Electrical Properties of Materials

Plastics

Ceramics and Composites

With an increase in mean free path of electrons, materials conductivity ________

With an increase in area of hysteresis curve, power loss will _______

Which of following is a primary bond network of rmosetting plastics?

What is resistivity of iron (in Ohm-m) at room temperature?

For a paramagnetic material, which of following statement is correct (μ_r = relative permeability)?

Thermoplastics have _________

The polymerization of two or more chemically different monomers forming a long molecular chain is termed as ________

Magnetic Bubbles are used as ______

Thermosetting plastics have ________

What is energy gap (Eg) of an insulator?

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