Related Questions

Ferromagnetic ceramic material is not used in the
A Thermal insulation
B Transformers
C Magnetic switches
D Television sets
Which of the following is a ferromagnetic material?
A Tungsten
B Aluminium
C Copper
D Nickel
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
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
In heating the ferromagnetic material by induction heating, heat is produced due to
A Induced current flow through the charge
B Hysteresis loss taking place below Curie temperature
C Due to hysteresis loss as well as eddy current loss taking place in the charge
D None of the above factors
Ferromagnetic material owe their properties to __________ inner sub-shells.
A Completely filled
B Partially filled
C Equally filled
D Vacant
Which of the following properties is found only in ferromagnetic materials ?
A Susceptibility independent of temperature
B Point in a particular direction
C Hysteresis
D Attracting a magnetic substance
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 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
Spontaneous magnetisation is characteristic of ferromagnetic materials.
A True
B False

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