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.Management Sciences
Category: Materials and Construction
Pure nickel is___________________?
A. Ferromagnetic above its curie point (i.e., 415°C)
B. Having h.c.p. crystal lattice
C. Ferromagnetic at room temperature
D. Not resistant to oxidation at high temperature
Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%) ?
A. Armature of small motors/generators
B. Generators and small motors
C. Induction motors
D. High frequency transformers
Gunmetal and bronze are not corroded by the action of__________________?
A. Wet chlorine
B. Synthetic detergent solution
C. Hydrochloric acid (10%)
D. Nitric acid (< 25%)
Graphite is corroded by_________________?
A. Sulphuric acid (10%)
B. Sea water
C. Hydrochloric acid
D. None of these
_____________ is added in low carbon steel to raise its yield point?
A. Sulphur
B. Phosphorous
C. Silicon
D. Manganese
The fermenter used for the production of ethyl alcohol from molasses is made of________________?
A. Wood
B. Concrete
C. Copper bearing steel
D. Porcelain
In hot wire anemometer used for gas flow measurement, the wire is normally made of ______________________?
A. Copper
B. Platinum
C. Constantan
D. Chromium
Brass container is suitable for storing__________________?
A. Aqueous ammonia
B. Beer
C. H2SO4 (95%)
D. Phosphoric acid (95%)
Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with_____________________?
A. Karbate
B. Lead or glass
C. Fireclay bricks
D. PVC
Atmospheric corrosion of metals result from their________________?
A. Slow oxidation
B. Fast oxidation
C. Fast hydration
D. Slow dehydration
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