Related Questions

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
A Chromium
B Nickel
C Tungsten
D Cobalt
Permanent magnets are made of high carbon steel and
A 15% of cobalt
B 20% of cobalt
C 35% of cobalt
D 45% of cobalt
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
A Low, high
B High, high
C High, low
D Low, low
Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
A Powder metallurgy
B Casting
C Forging
D None of these
Permanent magnets are normally made of
A Alnico alloys
B Aluminium
C Cast iron
D Wrought iron
The use of permanent magnets is. not made in
A magnetoes
B energy meters
C transformers
D loud-speakers
Which of the following memories contains a thin film of magnetic material sandwitched between two permanent bias magnets?
A ROM
B Magnetic disk
C Core memory
D Bubble memory
E None of the above
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio
A 50 : 20 : 20 : 10
B 40 : 30 : 20 : 10
C 50 : 20 : 10 : 20
D 30 : 20 : 30 : 20
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
A Chromium
B Nickel
C Vanadium
D Cobalt
Residual magnetism in steel for magnets is increased by the addition of
A Nickel
B Cobalt
C Tungsten
D Chromium

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