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Material and Components

Material and Components
Question:-
Option (A)
air capacitor
Option (B)
mica capacitor
Option (C)
ceramic capacitor
Option (D)
electrolytic capacitor
Correct Option:
D
Question:-
Option (A)
BCC
Option (B)
FCC
Option (C)
Hexagonal
Option (D)
Zinc blends
Correct Option:
D
Question:-
Option (A)
The critical temperature Tc must be high so that heating of the coil does not raise the temperature above Tc
Option (B)
The magnetic field produced by the current should be less than the critical field
Option (C)
The material should be pure so that its high conductivity allows more current to flow through the coil
Option (D)
Type I materials should be. used so that superconductivity exists below a sharply defined critical field
Correct Option:
A
Question Solution:
The critical value of magnetic field for the destruction of superconductivity, Hc is a function of temperature
Hc = H0 [1- (T/Tc)2]

Above Tc superconducting state will vanish. Therefore to produce an intense magnetic field, the Tc must be high so that heating of the coil does not raise the temperature above Tc
Question:-
Option (A)
1 only
Option (B)
2 only
Option (C)
Both 1 and 2
Option (D)
Neither 1 nor 2
Correct Option:
A
Question Solution:
For diamagnetic materials magnetic susceptibility cm is negative and independent of the intensity of the external magnetic field and of temperature.
Question:-
Option (A)
High dielectric constant
Option (B)
No hysteresis
Option (C)
Ferroelectric characteristic only above the Curie point
Option (D)
Electric dipole moment
Correct Option:
B
Question Solution:
Ferroelectric materials exhibit hysteresis loop.