Related Questions

Which of the following is not a ferromagnetic material?
A Nickel
B Cobalt
C Aluminium
D Iron
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
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
Ferromagnetic material owe their properties to __________ inner sub-shells.
A Completely filled
B Partially filled
C Equally filled
D Vacant
Which of the following is not used as the ceramic material in 'cermets'?
A Silicides
B Oxides
C Carbides
D Nitrides
Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
A Slag cement
B Glasses
C Porcelain/Potteries
D Teflon
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
A Graphite powder
B Thoria
C Zircon powder
D Beryllium
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

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