Related Questions

Which one of the following kinds of materials has the lowest permeability?
A A diamagnetic material
B A paramagnetic material
C A feiTomagnetic material
D All of the above
E None of the above
Substances which have permeability less than the permeability of free space are known as
A Ferromagnetic
B Paramagnetic
C Diamagnetic
D Bipolar
Out of the following, the materials having maximum magnetic permeability is
A Silicon steel (Si = 4%)
B Cast iron
C Wrought iron
D Mild steel
The relative permeability of materials is not constant.
A diamagnetic
B paramagnetic
C ferromagnetic
D insulating
Paramagnetic materials have relative permeability
A slightly less than unity
B equal to unity
C slightly more than unity
D equal to that ferromagnetic mate rials
Superconducting metal in super conducting state has relative permeability of
A Zero
B One
C Negative
D More than one
The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.
A minimum
B maximum
C nil
D none of the above
________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
A Cast steel
B Aluminium
C Soft steel
D Cast iron
The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
A Rigid
B Tough
C Ductile
D Plastic
Thermoplastic materials are those materials which
A Do not become hard with the application of heat and pressure and no chemical change occurs
B Are flexible and can withstand considerable wear under suitable conditions
C Are formed into shape under heat and pressure and results in a permanently hard product
D Are used as a friction lining for clutches and brakes

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