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Electrical Engineering
Materials And Components
Quiz 1
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Q.1
Ferrimagnetic materials have anti parallel orientation of equal moments of permanent dipoles.
True
False
Q.2
When a material is in superconducting state and a magnetic field is applied
The superconducting property is not affected
The superconducting property may be affected and resistivity may increase from zero to a low value
The superconducting property may be destroyed
The material may become an insulator
Q.3
As the atoms of rare gases become larger, electronic polarizability
Increases
Decreases
Remains the same
May increase or decrease
Q.4
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
Normal to both current and magnetic field
In the same direction as current
In a direction anti parallel to magnetic field
None of the above
Q.5
The residual resistivity of a binary alloy at 0 K is
Sum of residual resistivities of component metals
Difference of residual resistivities of component metals
Product of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy
Q.6
Nickel is a non-magnetic material.
True
False
Q.7
The number of protons in a copper atom are
2
9
11
29
Q.8
With increase in temperature, the electrical conductivity would
Increase in metals as well as in intrinsic semiconductor
Increase in metals but decrease in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor
Decrease in metals as well as in intrinsic semiconductor
Q.9
If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.
True
False
Q.10
Electrical contact materials used in switches, brushes, relay must possess
High thermal conductivity and high melting point
Low thermal conductivity and low melting pointL
High thermal conductivity and low melting point
Low thermal conductivity and high melting point
Q.11
The merger of hole and free electron is called
Covalent bonding
Recombination
Thermal energy
Free electrons
Q.12
In van der walls crystals, there exists a high degree of stability of the outer electron shell.
True
False
Q.13
On the basis of the type of chemical bonds, solids may be classified into
Ionic crystals
Ionic and valence crystals
Ionic crystal, valence crystals and metals
Ionic crystals, valence crystals, metal and vander wall crystals
Q.14
The phenomenon of dielectric hysteresis occurs with
DC
AC
Both AC and DC
None of the above
Q.15
When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
True
False
Q.16
The most important set of specifications of transformer oil include
dielectric strength and viscosity
dielectric strength and flash point
viscosity and flash point
flash point and viscosity
Q.17
If a small amount of Cu is added to Ni conductor, then
Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni
Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres
Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
Resistivity of Ni remains the same
Q.18
The elements which become superconducting at extremely low temperatures are
Good conductors at room temperature
Ferromagnetic at room temperature
Relatively poor conductors at room temperature
Insulators at room temperature
Q.19
In a metal, the valence electrons
Are not shared
Are shared only between neighbouring atoms
Are shared by all atoms
Either B or C
Q.20
Wood is a diamagnetic material.
True
False
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