1. Heating elements of electrical heaters are made of Tungsten Invar Nicheloy Nichrome 2. Endentor used in Vickers hardness testing machine is 25 mm dia ball 15 mm dia ball Diamond square-based pyramid 10 mm dia ball 3. Which of the following material is not used for cyaniding? Sodium chloride Sodium carbonate Sodium hydroxide Sodium cyanide 4. Manganese is added to steel primarily to increase Tensile strength Malleability Ductility Fatigue strength 5. In nodular iron, graphite is present in the form of Needles Powder Spheroids Flakes 6. In which process steel is heated below the critical temperature Annealing Temperting Carburizing Hardening 7. Just as strong is opposite of weak likewise elastic is opposite of Rigid Soft Ductile Inelastic 8. Which of the following structure is least hard? Presence of cementite Pearlite Sorbite Martensite 9. Chilling, heat treatment and alloy addition to cast iron generally reduces wear resistance reduces carbon percentage reduces machinability improves machinability 10. When steel is made from phosphatic iron, it is likely to be Hard Brittle Tough Ductile 11. Th phenomenon of emf development between two diferent metals placed in contact is known as Thomson effect Seeback effect Peltier effect Kelvin effect 12. Local hardening of steel can be done by all of the following EXCEPT flame hardening Low specific heat of quenching oil stepped uniform heating resistance heating 13. Which of the following element does not impart hardness to steel? Chromium Silicon Copper Nickel 14. The property which enables metals to be drawn into wire is known as Malleability Plastic deformation Elastic deformation Ductility 15. Highest specific gravity is of Titanium Steel Copper Lead 16. Compressive strength is highest in case of Cast iron Wrought iron Mild steel High carbon steel 17. Under identical values of cold and hot junction temperatures which thermocouple given the highest output Iron constantan Nickel nimo Chromel-constantan All give equal output 18. The flux used in brazing is usually Lime Borax Common salt Alum 19. Hardening by carburizing is limited to 2 mm 5 mm Low specific heat of quenching oil 0.05 mm 20. The upper range of mercury thermometer can be increased by Taking into account expansion of tube Filling the stem with nitrogen under pressure Range cannot be increased Increasing tube diameter 21. The electrical conductivity of ferrites is Less than that of ferromagnetic materials Equal to that of ferromagnetic materials Greater than that of ferromagnetic materials Very high as compared to that of ferromagnetic materials 22. In tool steel the sulphur content is usually not allowed to exceed 0.001 percent 0.035 percent 3.5 percent 5 percent 23. The depth of hardening is affected by Size of specimen Hardenability of steel Quenching medium All of the options 24. Which of the following is the softest material? Fluorite Calcite Corundum Diamond 25. Which hardening process is generally not used for steels? Nitriding Induction hardening Age hardening Pack carburising 26. Silicon when added to copper increases its Hardness Malleability Brittleness Electrical conductivity 27. The process of providing zinc coating on steel pipes is known as Cold working Blistering Galvanising Pickling 28. Which iron ore has least percentage of iron Limonite All have almost equal percentage of iron ore Siderite Magnetite 29. Nichrome contains Nickel and copper Nickel and chromium Nickel, copper and vanadium Nickel, lead and zinc 30. The effect of austenitic grain size development during heat treatment is lower internal stress greater toughness lower hardenability All of the options 31. Warping may be avoided when quenching a long slender piece of work by Hoding the work piece vertically over the quenching bath and plunging it straight Pulling the piece from both ends Holding the work piece between clamps and pouring water on it Holding the piece horizontally in adequate supports 32. Uniformity of zinc coating on pipes is tested by Dipping the sample for 10 minutes in calcium hydroxide solution Dipping the sample in water Dipping the sample for 1 minute in neutral copper sulphate solution Dipping the sample for 1 minute in conc, hydrochloric acid 33. The maximum percentage of carbon in austenite is 2.70% 1.70% 2% 0.07% 34. Which of the following materials are usually most ductile? Non-metallic Body centred lattice Face centred cubic lattice Amorphous 35. Alpha brass is a (an) Inermediate phase Substitutional solid solution Interstitial compound None of the options 36. Which of the follwing is usually made of mild steel? Drop forgings Channels Fish plates Shear blades 37. Which of the following is by product from blast furnace? Flue dust Blast furnace gas Slag All of the options 38. Which of the following is a non-destructive test? Cupping test Charpy test Tensile test X-ray test 39. If a sample of steel shown excessive hardness after tempering the probable cause could be High temperature during tempering Insufficient holding time during tempering Change in volume during cooling Excessive proportion of alloying elements 40. Which of the following is not a hardening process? Sphcroidizing Carburising Nitriding Cyaniding 41. In grey cast iron, free graphite is in the form of Needles Fine powder Flakes Nodules 42. Which of the following material is viscoelastic in properties? Glass Graphite Cork Rubber 43. Which of the following is usually not a constituent of paints? Career Pigment Vehicle Drier 44. If a medium carbon hardened steel shows pearlite structure it may be concluded that Presence of cementite Steel has been quenched in oil Steel has been slowly cooled in furnace Steel contains impurities 45. Above the curie temperature, a magnetic material becomes Dielectric Ferromagnetic Paramagnetic Diamagnetic 46. Which of the following is not true in case of white cast iron It is brittle It is strong It is whitish in colour It is malleable 47. Magnetism is non-linearly related to the applied field in case of Diamagnetic field Paramagnetic field Ferromagnetic field All of the options 48. Brinell hardness of nitrided surface may be of the order of 150 to 200 More than 600 300 to 450 200 to 250 49. Bell metal is an alloy of Copper and tin Copper, antimony, aluminium and zinc Copper and lead Coper, tin, lead and zinc 50. Which of the following material has body centred cubic structure? 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