Related Questions

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
A 768
B 1127
C 1359
D 1480
Ferromagnetic material owe their properties to __________ inner sub-shells.
A Completely filled
B Partially filled
C Equally filled
D Vacant
Spontaneous magnetisation is characteristic of ferromagnetic materials.
A True
B False
Heating of ferromagnetic materials to a temperature above Curie temperature makes it
A Insulator for heat & electricity transmission
B Ferritic
C Behave like paramagnetic materials
D Superconductor
Which of the following is a ferromagnetic material?
A Tungsten
B Aluminium
C Copper
D Nickel
Which of the following is not a ferromagnetic material?
A Nickel
B Cobalt
C Aluminium
D Iron
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
A 770°C
B 910°C
C 1050°C
D Below recrystallization temperature
The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the
A Critical point
B Curie temperature
C Inversion temperature
D Eutectic temperature
Ferromagnetic alpha iron exists in temperature range of
A Below 723°C
B 770 to 910°C
C 910 to 1440°C
D 1400 to 1539°C
The relative permeability of a ferromagnetic material is
A Less than one
B More than one
C More than 10
D More than 100 or 1000

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