__________ moulding process can not be used for thermoplastic plastics.
A. Compression
B. Extrusion
C. Injection
D. None of these
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Carbon tetrachloride can be stored in a storage vessel made of
A. High silicon iron (14% Si)
B. Tin
C. Stainless steel
D. All of the above
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100% H2 SO4 at 30°C can't be stored in a vessel made/lined with
A. Cast iron and high silicon iron
B. Mild steel and stainless steel
C. Aluminium, tin and rubber
D. Teflon, glass and porcelain
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Mercury is transported in metal containers made of
A. Aluminium
B. Iron
C. Lead
D. Nickel
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Mercury is transported in metal containers made of
A. Aluminium
B. Iron
C. Lead
D. Nickel
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Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis 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
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Nickel made/clad equipments are suitable for handling
A. Ammonia (both aqueous & anhydrous)
B. Fruit juices, milk & its products and caustic soda solution
C. Nitric acid & hydrochloric acid (conc)
D. Sulphuric acid (conc)
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Slow and progressive deformation of a material with time under constant stress is called
A. Creep
B. Erosion
C. Resilience
D. None of these
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Which of the following is not used as the ceramic material in 'cermets'?
A. Silicides
B. Oxides
C. Carbides
D. Nitrides
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The most resistant material to alkaline corrosion is
A. Duriron
B. Nickel
C. Aluminium
D. Karbate
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__________ possesses viscoelastic properties.
A. Cork
B. Glass
C. Graphite
D. Rubber
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Fatigue failure of a material results from __________ stress.
A. Tensile
B. Compressive
C. Fluctuating
D. None of these
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__________ is added in stainless steel to prevent inter crystal corrosion.
A. Vanadium
B. Niobium
C. Chromium
D. Nickel
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__________ is never shipped in glass carboys.
A. Ammonia
B. Acetic acid
C. Phenol
D. Formaldehyde
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Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
A. Aluminium
B. Stainles steel
C. High silicon (14%) iron
D. Copper
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Trough of an apron conveyor is made of
A. Lead lined concrete vessel
B. Wood
C. Metal
D. Either B or C
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Presence of cobalt in steel improves its
A. Cutting ability
B. Corrosion resistance
C. Tensile strength
D. None of these
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Most suitable material of construction for the storage of concentrated nitric acid is
A. Cast iron
B. Monel
C. Karbate
D. Aluminium or chromium alloys (Cr > 18% for cold acid)
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Which of the following pairs of elements may form an alloy?
A. Iron & carbon
B. Iron & mercury
C. Platinum & mercury
D. None of these
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The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.
A. Abrasive
B. Corrosive
C. Both A & B
D. Neither A nor B
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