0% 0 Materials and Construction Quiz 7 1 / 50 Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis 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%) ? Induction motors Armature of small motors/generators High frequency transformers Generators and small motors 2 / 50 Rotary kilns in cement industry are lined with ______bricks? Lead Fireclay High alumina & high magnesia Silica 3 / 50 Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with_______? Rubber Acidic refractory Karbate Lead or acid proof bricks 4 / 50 Tank furnace used for melting of glass is made of_____? Stainless steel Mild steel Refractory blocks Cast iron 5 / 50 Reactor used in the production of polyvinyl chloride (PVC) is made of______? Tantalum Lead Aluminium Nickel or glass lined steel 6 / 50 Silicon percentage in acid resistant cast iron is about_________? 4 14 20 8 7 / 50 Steel rods are used in reinforced concrete to increase its _______ strength? Compressive None of these Shear Tensile 8 / 50 Softness of silver can be converted into hardness by alloying it with small quantity of__________? Copper & nickel Tin Aluminium Zinc 9 / 50 Silicon percentage in iron castings to have maximum hardness should be about___________? 0.8 0.5 2.5 0.3 10 / 50 Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with___________? Acidic refractory Karbate Lead or acid-proof bricks Rubber 11 / 50 Stainless steel contains__________? Vanadium Aluminium Chromium and nickel Copper 12 / 50 Sherardizing process is used for___________? None of these Cold working on metals Surface coating Heat treatment of high speed steel 13 / 50 Presence of high phosphorous in cast iron increases its______? Fluidity Tensile strength Melting point Shrinkage 14 / 50 Stainless steel is not corroded by _______? Nitric acid (10%) Saturated brine Sulphuric acid (10%) Hydrochloric acid (10%) 15 / 50 Slow plastic deformation of metals under a constant stress is termed as ______ failure? Creep Endurance None of these Fatigue 16 / 50 Teflon (PTFE) is corroded by________? Hydrochloric acid (10%) Hydrochloric acid (95%) None of these Sulphuric acid 17 / 50 Presence of 0.3 to 0.5% arsenic in copper increases its______? Ductility Malleability Tenacity & hardness Electrical conductivity 18 / 50 Refined acetic acid storage vessel are made of_____? High carbon steel Nickel Aluminium Copper 19 / 50 Steel balls for ball bearings are generally made of _______ steel? Carbon chrome Free carbon Stainless Cast 20 / 50 Shock resisting steels should possess high_____? Tensile strength Hardness Wear resistance Toughness 21 / 50 Specify the material of construction suitable for handling concentrated HNO3 at 100?C ? High silicon iron, Kel-F and Teflon Tin and wood Stainless steel Silicone rubber 22 / 50 Spray dryer for evaporating milk to produce milk powder is made of__________? Lead lined steel Stainless steel Aluminium Cast iron 23 / 50 Silicone rubber is not resistant to the corrosive action of______? Ether Sulphuric acid (10%) Sulphuric acid (95%) Both B. and C. 24 / 50 SO3 is absorbed using H2SO4 in a______? Stainless steel plate tower Packed steel tower lined with acid proof bricks None of these Cast iron packed tower 25 / 50 Rubber lined vessels are corroded by the action of___________? Chloroform Sulphuric acid (95%) All A., B. and C. Aqua regia 26 / 50 Residual magnetism in steel for magnets is increased by the addition of___________? Nickel Tungsten Cobalt Chromium 27 / 50 Softening of hardened steel is done by its_______? Normalising Annealing Carburising Tempering 28 / 50 Rotary driers are generally made of________? Cast iron Tin lined with refractory bricks Mild steel High silicon iron (14% Si) 29 / 50 Sulphur melting pit in the sulphuric acid plant is made of___________? Cast iron Lead lined stainless steel Hard wood Steel or cement-brick lined 30 / 50 Rubber lined pumps can be used to pump__________? All A., B. and C. Hypochlorous acid Caustic soda Chlorinated brine 31 / 50 Spark plugs are made of________? High alumina ceramic Corundum Carborundum Metallic carbides 32 / 50 Soap kettle used in the production of laundry soap is made of______? Cast iron Steel with top section nickel clad or stainless steel Nickel Concrete 33 / 50 Presence of even 0.005% of ______ in copper makes it highly brittle, rendering it useless for wire-drawing? Antimony Bismuth Oxygen Arsenic 34 / 50 Presence of cobalt in steel improves its______? Corrosion resistance None of these Tensile strength Cutting ability 35 / 50 Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is ______ percent? 0.5 0.2 0.35 0.02 36 / 50 Presence of nickel in steel improves its__________? Corrosion resistance Wear resistance All A., B. and C. Cutting ability 37 / 50 Presence of nitrogen in steel_____? Makes it brittle Increases its strength Increases its hardness Is desirable 38 / 50 Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)_____? Do not have good resilience properties Are used for leaf and coiled springs Do not require heat treatment for any of its applications Is tempered at 850?C 39 / 50 Reduction in the grain size reduces the ________ of the material? Fatigue resistance All A., B. & C. Tensile strength Creep resistance 40 / 50 Spark plugs, ignition tubes and electrodes are made of nickel _____ alloys? Iron Manganese Copper Beryllium 41 / 50 Steel tower used for the storage of oleum_________? Need not be lined Is lined with rubber Is lined with lead Is lined with acid-proof bricks 42 / 50 Presence of silicon in steel_______? Decreases the blow holes formation tendency in castings Is in the form of free Si Indicates that steel is not deoxidised properly None of these 43 / 50 Presence of even very minute amount (say 0.1%) of _______ in copper, reduces its electrical conductivity very seriously? Bismuth Arsenic Both B. and C. Antimony 44 / 50 Purity of electrical grade aluminium should be ? ______ percent? 99.5 85 95 90 45 / 50 Steel pipes are normally manufactured by _______ process? Cold working Extrusion Forging Electroforming 46 / 50 Presence of manganese in alloy steel improves its_____? Abrasion resistance & toughness Cutting ability Corrosion resistance Elasticity & creep resistance 47 / 50 Sulphuric acid pickling tanks are lined with___________? Nickel Aluminium Glass Rubber 48 / 50 Presence of high amount of silicon in cast iron_________? Increases the formation of graphite Increases the contraction of the metal Suppresses the decomposition of Fe3C Reduces its fluidity 49 / 50 Tempering of steel is done to make it_________? Soft Hard Rollable Brittle 50 / 50 Slow and progressive deformation of a material with time under constant stress is called_____? Resilience None of these Erosion Creep Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMaterials and Construction Quiz 6 Materials and Construction Quiz 8Next
