The digester of a Gobar gas plant is a
A. Mild steel drum
B. Stainless steel vessel
C. Masonry well
D. Cast iron vessel
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The ability of a material to absorb energy in the elastic range is a measure of its
A. Toughness
B. Resilience
C. Malleability
D. Brittleness
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Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system?
A. High silicon iron, silicon rubber, Kel-F and teflon
B. Mild steel and stainless steel
C. Cast iron, tin and aluminium
D. Copper, nickel and monel
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Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
A. High co-efficient of thermal expansion
B. Low thermal conductivity
C. High corrosion resistance
D. All of the above
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Rotary kilns in cement industry are lined with____bricks.
A. Fireclay
B. Silica
C. Lead
D. High alumina & high magnesia
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The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
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Which of the following is not an alloy of copper and tin?
A. Bell metal
B. Gun metal
C. Admiralty gun metal
D. Monel metal
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Cast iron detachable joint is used in __________ pipes.
A. Steel
B. Cast iron
C. Asbestos cement
D. Reinforced cement concrete
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Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
A. Acetic acid
B. Benzoic & boric acids
C. Phosphoric acid (95%) & sulphuric acid (95%)
D. Hydrochloric acid (concentrated)
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The softest material just next to talc in the Mhos scale is
A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite
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Brass container is suitable for storing
A. Aqueous ammonia
B. Beer
C. H2 SO4 (95%)
D. Phosphoric acid (95%)
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Hardening of steel is not possible unless it is heated __________ critical point.
A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third
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Mild steel is a/an __________ steel.
A. Low carbon
B. Medium carbon
C. High carbon
D. High alloy
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__________ is added in low carbon steel to raise its yield point.
A. Sulphur
B. Phosphorous
C. Silicon
D. Manganese
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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
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Telfon (PTFE) is corroded by
A. Hydrochloric acid (10%)
B. Hydrochloric acid (95%)
C. Sulphuric acid
D. None of these
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Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
A. Cermet
B. Glass
C. Thermosetting plastic
D. Metallic alloy
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Electronic structure of a material is generally studied by
A. Metallurgical microscope
B. Electron diffraction
C. Spectroscopic techniques
D. X-ray
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__________ alloys have the highest specific strength of all the structural materials out of the following.
A. Magnetic steel
B. Titanium
C. Chromium
D. Magnesium
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Slow plastic deformation of metals under a constant stress is termed as __________ failure.
A. Fatigue
B. Endurance
C. Creep
D. None of these
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