Related Questions

Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is
A 12
B 36
C 54
D 68
Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel
A 24 %
B 36 %
C 40 %
D 60 %
Nickel is not used as a catalyst in the __________ reaction.
A Shift conversion
B Oil hydrogenation
C Steaming reforming of naphtha
D Ammonia cracking/dissociation
Oil is hydrogenated using nickel catalyst in a __________ reactor.
A Batch
B Slurry
C Fluidised bed
D Fixed bed
For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.
A (i) platinum (ii) sulphur
B (i) palladium (ii) oxygen
C (i) nickel (ii) sulphur
D (i) nickel (ii) oxygen
A catalyst is said to be a negative catalyst, ifit
A Retards the rate of reaction
B Reduces the value of equilibrium constant
C Does not initiate the reaction
D All of the above
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
A Tan hT/T
B Tan T/T
C Tan hT/tan T
D None of these
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
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
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
A Surgical instruments
B Powerful magnets
C Chemical equipments
D Boiler tubes

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