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1) Which of the following contains maximum percentage of carbon ? a. Boiler plate steel b. Rail steel c. Saws for cutting steel d. Railway spring steel
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2) Hot working of lead is carried out at_________________? a. 75° C b. 373° K c. 150° C d. Room temperature
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3) 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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4) Mild steel is ___________________? a. A low carbon steel (0.05 to 0.3% carbon) b. Highly resistant to corrosion (as much as stainless steel) c. A high carbon steel (0.5 to 1.5% carbon) d. Very poor in strength & ductility
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5) 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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6) ______________ can replace tungsten in high speed steel ? a. Chromium b. Vanadium c. Cobalt d. Molybdenum
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7) Which of the following is not an alloy of tin ? a. White-bearing metal b. Pewter type metal c. Soft solder d. German silver
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8) When the steel is subjected to normalising, its ______________ decreases? a. Yield point b. Ductility c. Ultimate tensile strength (UTS) d. None of these
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9) Concentrated HCl at 30°C can be stored in a vessel made of ________________________? a. PTFE and porcelain b. Cast iron and aluminium c. Stainless steel and high silicon cast iron d. None of these
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10) German silver in an alloy of________________? a. Copper, nickel and zinc b. Copper, aluminium and silver c. Silver, zinc and aluminium d. Silver, nickel and zinc
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11) Work hardening of a material ________________? a. Decreases its tensile strength b. Decreases its ductility c. Increases its ductility d. Does not affect its ductility
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12) Which of the following is a non-magnetic material ? a. Cobalt b. Zinc c. Nickel d. None of these
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13) 18/8 steel is a/an __________ stainless steel ? a. Austenitic b. Ferritic c. Martensitic d. None of these
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14) Percentage elongation of a material is a measure of its _______________________? a. Ductility b. Brittleness c. Toughness d. Malleability
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15) Tin vessels are corroded by____________________? a. Anhydrous ammonia b. Aromatic solvents c. Synthetic detergent solution d. None of these
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16) Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by_________________? a. Dilute HCI b. Acetic acid c. Concentrated H2SO4 d. None of these
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17) Presence of high amount of silicon in cast iron________________? a. Suppresses the decomposition of Fe3C b. Increases the formation of graphite c. Increases the contraction of the metal d. Reduces its fluidity
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18) The main purpose of galvanising iron sheets is to___________________? a. Harden the surface b. Increase its glossiness and lustre c. Prevent the action of water d. Prevent the action of oxygen
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19) The temperature at which new grains are formed in the metal is called the ______________ temperature? a. Eutectic b. Recrystallisation c. Upper critical d. Lower critical
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20) Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ? a. Invar b. Constantan c. Chromel d. Alumel
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21) Caustic soda can be stored in _____________ drums? a. Steel b. Cast iron c. Brass d. Gun metal
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22) 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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23) The material of construction of pressure mills used for squeezing out the juice from sugar cane is__________________? a. Stainless steel b. Cast iron c. Mild steel d. Monel
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24) Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and_________________? a. Moving mercury and graphite b. Graphite and moving mercury c. Moving mercury and carbon d. Moving mercury and crimped steel wire
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25) Most common stainless steel type 316, which is highly resistant to corrosion contains______________? a. 16-13% Cr 10-14% Ni and 2-3% Mo b. 20-22% Cr, and 8-10% Ni c. 2-4% Cr, 22% NI and 2-4% Mo d. None of these
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26) Galvanised iron is___________________? a. Harder b. Protected from rusting c. Alumina coated iron d. None of these
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27) Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as_____________________? a. Sherardizing b. Parkerising c. Anodising d. None of these
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28) Cermets are ______________ materials? a. Refractory b. Reinforced c. Abrasive d. Fully metallic
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29) Molten phthalic anhydride is stored in a/an _______________ vessel? a. Aluminium b. Nickel clad steel c. Lead lined steel d. Glass lined steel
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30) 18-4-1 high speed steel contains 18%, 4% and 1% respectively of____________________? a. Tungsten, vanadium and chromium b. Tungsten, chromium and vanadium c. Vanadium, chromium and tungsten d. Chromium, tungsten and vanadium
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