Q161
Open questionA material is said to have become superconductor when
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ECE · all questionsMaterials And Components
Materials And Components
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Q162
Open questionHow much (approximate) is the frequency independent power factor of a plastic dielectric capacitor?
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Q163
Open questionWhich of the following materials is not an insulator?
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Q164
Open questionIt is possible to destroy the superconductivity of a material by applying
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Q165
Open questionWhich of the following are the properties of ferromagnetic domains?
1. Permanent magnetization
2. Atomic moments in individual domains are all aligned neither parallel to nor perpendicular to one another below Curie point temperature
3. Each domain is magnetically saturated
4. Above Curie temperature, domains disrupt
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1. Permanent magnetization
2. Atomic moments in individual domains are all aligned neither parallel to nor perpendicular to one another below Curie point temperature
3. Each domain is magnetically saturated
4. Above Curie temperature, domains disrupt
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Q166
Open questionMetal film resistors are made by depositing a very thin layer of metal on a
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Q167
Open questionIntrinsic semiconductor are those which
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Q168
Open questionA perfect conductor has
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Q169
Open questionWhich of the following point are important on the viscosity scale in the fabrication and processing of glasses?
1. Softening point
2. Working point
3. Melting point
1. Softening point
2. Working point
3. Melting point
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Q170
Open questionWhich of these ceramic materials have relative permittivity εr between 3 to 6 and loss angle tan δ between 50 × 10-4 to 100 × 10-4?
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Q171
Open questionIntense magnetic field may be produced in a coil by using a
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Q172
Open questionWhich of the following are not the production methods for carbon nanotubes?
1. Electric arc discharge method
2. Laser vaporization method
3. Czochralski method
4. Metallization method
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1. Electric arc discharge method
2. Laser vaporization method
3. Czochralski method
4. Metallization method
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Q173
Open questionSuperconductors are becoming popular for use in
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Q174
Open questionCeramic resonators use which one of the following?
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Q175
Open questionWhich of the following statements are correct for ceramic materials?
1. They are inorganic substances
2. They are brittle
3. They are good thermal insulators
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1. They are inorganic substances
2. They are brittle
3. They are good thermal insulators
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Q176
Open questionA superconductor may be used for generating
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Q177
Open questionThe difference between the number of atoms in a unit cell of a bcc crystal and an FCC crystal is
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Q178
Open questionFerromagnetic materials show hysteresis in B-H characteristics. As the magnetic field is increases slowly from zero value, what is the first process which sets in the material to give net magnetization?
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Q179
Open questionIn ruby laser, which of the following is true
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Q180
Open questionFor a permanent magnetic material
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