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1) Which of the following is an ore dressing operation ? a. Classification b. Smelting c. Roasting d. None of these
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2) Shampoos are commercially not available in the form of ___________________? a. Powder b. Gaseous mixture c. Solution d. Emulsion
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3) In multipass welds, shot peening is done after each pass to__________________? a. Close the surface porosity b. Break the continuity of columnar grains c. Flatten the weldment d. Introduce texture in the weld
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4) Pick out the correct combination about the role of various additives used in polymers ? a. Plasticiser: increases the polymer strength b. Heat stabiliser: increases the maximum service temperature c. Fillers: Does not affect the property of polymer but increases its weight d. Lubricants: increases the flexibility of polymers
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5) Which of the following is not used as a bearing material ? a. Copper-lead alloys b. Babbitts c. Bronzes d. Cermets
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6) The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ? a. Lead b. Copper c. Aluminium d. Wrought iron
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7) Oxide layer formed on the non-ferrous metal surface after its annealing is__________________? a. Removed by acid pickling b. Hammered into the surface c. Removed with coarse emery cloth d. Left as such to protect the surface
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8) Case hardening is not done by________________? a. Nitriding b. Hot dipping c. Electroplating d. Both ‘B’ & ‘C’
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9) Upto the critical radius of insulation, added insulation, will____________________? a. Increase the heat loss b. Decrease heat loss and will have no effect beyond that c. Decrease heat flux d. Reduce convection heat loss compared to conduction heat less
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10) Chlorine acts as a bleaching agent only in the presence of ______________________? a. Dry air b. Pure oxygen c. Moisture d. Sunlight
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11) Powder metallurgy technique is used in the production of ____________________ tools ? a. Tungsten carbide b. High carbon steel c. High speed steel d. Drilling
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12) Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________? a. Upward thrust due to air b. Viscous force exerted by air c. Surface tension effects of water d. Force of gravity
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13) Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ? a. 1.5 b. 3 c. 5 d. 7
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14) Colour comparator is used to measure the___________________? a. pH value b. Electrode potential c. Colour intensity d. None of these
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15) A reduction in thermal resistance during heat transfer does not occur in the___________________? a. Convection heat transfer by stirring the fluid and cleaning the heating surface b. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity c. Radiation heat transfer by increasing the temperature and reducing the emissivity d. None of these
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16) Plastics as a material of construction suffer from the drawback of low_________________? a. Machinability b. Density c. Strength d. Plastic deformation
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17) The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________? a. y2 = 2k1t + k2 b. y = k1 ln (k2t + k3) c. y = k1 t + k2 d. y = k1t3 + k2
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18) Biological shield in a nuclear reactor is generally provided to protect against the__________________? a. α-rays b. β-rays c. Gamma rays & neutrons d. Electrons
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19) The most detrimental impurity in high pressure boiler feed water is ___________________? a. Suspended salt b. Dissolved salt c. Silica d. Turbidity
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20) Sub zero treatment of steel is done to____________________? a. Suppress martensite transformation b. Enhance its working performance in sub zero atmosphere c. Reduce the retained austenite in hardened steel d. Induce temper brittleness after its hardening
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21) In Newton’s law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ? a. V2 b. 1/V2 c. 1/Vg d. Vg
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22) Which of the following is not categorised as the ore agglomeration process ? a. Nodulising b. Pelletising c. Balling d. Briquetting
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23) Tumbling is the process of improving the ________________ of the materials/parts ? a. Surface finish b. Fatigue limit c. Creep limit d. Surface cleanliness
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24) Young’s modulus of a material is the measure of its ___________________? a. Stiffness b. Malleability c. Creep resistance d. Tensile strength
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25) Which of the following materials has the least scrap value ? a. Aluminium b. Stainless steel c. Brass d. Copper
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26) Which of the following is used to produce draught in the locomotive boilers ? a. Chimney b. Induced draught fan c. Forced draught fan d. Steam jet arrangement
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27) Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________? a. Very low which prevents their ignition by compression b. Very high which prevents their ignition by compression c. Zero d. None of these
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28) The process of removal of scale formed during hot rolling of steel is termed as_________________? a. Descaling b. Shot blasting c. Pickling d. Skimming
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29) Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________? a. Temperature is low b. Atmospheric pressure is low c. Atmospheric pressure is high d. None of these
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30) The leaching solvent used in Baeyer’s process for the purification of bauxite is___________________? a. Ammonium hydroxide b. Sodium carbonate c. Sodium hydroxide d. Ammonium carbonate
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31) With increase in annealing temperature, the following defect density decreases? a. Vacancy b. Dislocation c. Grain boundary d. All of these
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32) A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________? a. Aqueous tension b. Saturated humidity c. Vapor pressure d. Absolute humidity
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33) Addition of _______________ to steel does not help in improving its machinability ? a. Sulphur b. Silicon c. Lead d. Phosphorous
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34) Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ? a. 5 b. 10 c. 20 d. 35
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35) Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are____________________? a. Nickel, cobalt & chromium b. Tungsten, chromium & cobalt c. Manganese, chromium & cobalt d. Tungsten, molybdenum & nickel
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36) _______________ test can be termed as the semi-destructive test? a. Impact b. Torsion c. Hardness d. Charpy
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37) Dowtherm is a____________________? a. High temperature heating medium (a petroleum product) b. Product of coal tar distillation c. Very heat sensitive material d. None of these
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38) Boiler tube size is specified by its thickness and _____________________ diameter ? a. Outside b. Inside c. Mean d. None of these
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39) The rolling process cannot be used to produce______________________? a. Plates b. Rods c. Tubes d. Wires
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40) In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________? a. Jet of water at high pressure b. Blast of air c. Mixture of water and air d. Rain of molten lead
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