Related Questions

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 trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
A Ceramic
B Stellite
C Diamond
D Cemented carbide
Perminvar alloy having constant permeability is an alloy of
A Nickel, copper and iron
B Nickel, copper and zinc
C Copper, nickel and antimony
D Iron, zinc and bismuth
The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.
A Less than
B Equal to
C More than
D Either B or C; depends on the type of alloy
Constantan an alloy used in thermocouples is an alloy of
A Copper and tin
B Copper and zinc
C Copper and iron
D Copper and nickel
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
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
A Surgical instruments
B Powerful magnets
C Chemical equipments
D Boiler tubes
Cobalt in steel
A increases hardness
B decreases toughness
C increases strength
D all of these
Presence of cobalt in steel improves its
A Cutting ability
B Corrosion resistance
C Tensile strength
D None of these
মৌলের ল্যাটিন নাম-i. Cobalt, Cadmiumii. Natrium, Cuprumiii. Wolfram, Ferrumনিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii

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