Description : Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of (A) 90% tungsten carbide and 10% cobalt (B) 70% aluminium oxide & 30% silica (C) 30% nickel, 15% chromium & 55% tungsten (D) 65% tungsten & 35% zirconium
Last Answer : Option A
Description : Broaching tools are usually made of (A) Cermets (B) High speed steel (C) Tungsten carbide (D) Stellite
Last Answer : Option B
Description : Which of the following can be manufactured using powder metallurgy techniques? (A) Brake linings (B) Bearings (C) Carbide tool tips (D) All 'a', 'b' and 'c'
Last Answer : (D) All 'a', 'b' and 'c'
Description : Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2)? (A) High speed steel (B) Stainless steel (C) Tungsten carbide (D) Superalloys
Last Answer : (C) Tungsten carbide
Description : Drills are usually made of (A) Cermets (B) High speed steel (C) Alloy steel (D) Tungsten carbide
Description : Which of the following is the most wear resistant grade of carbide used for the cutting tools? (A) Aluminium carbide (B) Tungsten carbide (C) Nickel carbide (D) Iron carbid
Description : Which of the following is the most wear resistant grade of carbide used for the cutting tools? (A) Aluminium carbide (B) Tungsten carbide (C) Nickel carbide (D) Iron carbide
Description : Highest cutting speed is achieved by the __________ tool material. (A) High speed steel (B) Carbide (C) Cast alloy (D) Plain carbon steel
Last Answer : (B) Carbide
Description : _________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide
Last Answer : (A) Boron carbide
Description : In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of (A) Stainless steel (B) Mild steel (C) High speed steel (D) High carbon steel
Last Answer : (C) High speed steel
Description : The process of heating the cold pressed metallic powder is called __________ in powder metallurgy. (A) Precipitation (B) Fusion (C) Sintering (D) Agglomeration
Last Answer : (C) Sintering
Description : Cemented carbide tools are not suitable for cutting (A) Aluminium (B) Brass (C) Cast iron (D) Steel
Last Answer : (A) Aluminium
Description : __________ can replace tungsten in high speed steel, (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum
Last Answer : (D) Molybdenum
Description : Hypersil' is a __________ steel. (A) High speed (B) Silicon (C) Molybdenum (D) Tungsten
Last Answer : (B) Silicon
Description : __________ can replace tungsten in high speed steel. (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum
Last Answer : (C) Cobalt
Description : __________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten. (A) Stellite (B) High speed steel (C) Cermet (D) Alnico
Description : Powder metallurgy is used to produce (A) High precision components with complex cavities and sharp features (B) Components of large size (C) Porosity free components (D) Components of such alloys whose constituents do not form alloys readily
Last Answer : (C) Porosity free components
Description : Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel. (A) Wrought (B) Tool (C) Alloy (D) Plain carbon
Last Answer : (D) Plain carbon
Description : Fire refining process is employed in case of (A) Tin (B) Copper (C) Zinc (D) Aluminium
Last Answer : (B) Copper
Description : Tin coating on metals is not done by (A) Spraying (B) Powder metallurgy (C) Hot dipping (D) Electro-deposition
Last Answer : (B) Powder metallurgy
Description : For preparation of porous bearings by powder metallurgy, preferred particle shape is (A) Spherical (B) Nodular (C) Irregular (D) No preferred shape
Last Answer : (A) Spherical
Description : Powder metallurgy process does not make metal powder by (A) Atomisation (B) Grinding/milling (C) Hammering (D) Electrolytic deposition
Last Answer : Option C
Description : Are tungsten carbide prices going up?
Last Answer : I use tungsten carbide burrs on my rotary grinder and they have not changed in price in the last couple of years. I didn’t know they made jewelry out of tc, is it pretty?
Description : Carbon is present in the combined form (carbide) in case of (A) Pig iron (B) Steel (C) Ferroalloys (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Decarburisation of steel (A) Is the removal of carbon from iron carbide (Fe3C) (B) Affects its crystalline structure (C) Is favoured by CO2 (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Which of the following alloying elements is present in maximum percentage in high speed steel? (A) Molybdenum (B) Chromium (C) Tungsten (D) Vanadium
Last Answer : (C) Tungsten
Description : 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
Last Answer : (B) Tungsten, chromium and vanadium
Last Answer : (A) Molybdenum
Description : 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
Description : What are the properties of powder metallurgy ?
Last Answer : The advantages of powder metallurgy are given below: All the products which cannot be made in any other way , can be made in this way. Products can also be made with a mixture of metallic ... case of mass production. Skilled workers are not needed. The product produced is very smooth and beautiful.
Description : What is powder metallurgy ?
Last Answer : The branch of metallurgy which deals with the preparation of metal powders and the use of specific heat and pressure from that powder to make human service utensils or desirable working materials and their properties is called powder metallurgy .
Description : High speed steel tools retain their hardness upto a temperature of __________ °C. (A) 500 (B) 750 (C) 900 (D) 1100
Last Answer : (C) 900
Description : Commercial production of calcium carbide requires limestone and __________ as raw materials. (A) Coke (B) Sand (C) Soda ash (D) Fuel oil
Last Answer : (B) Sand
Description : High speed cutting tool steels contain about __________ percent of tungsten. (A) 6-8 (B) 18-20 (C) 30-35 (D) 50-55
Last Answer : (B) 18-20
Description : Addition of __________ in steel can help in increasing the depth of hardness. (A) Nickel (B) Chromium (C) Vanadium (D) Tungsten
Last Answer : (D) Tungsten
Description : 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
Last Answer : (D) Cobalt
Description : Addition of __________ in steel is helpful in increasing the depth of hardness. (A) Chromium (B) Sulphur (C) Vanadium (D) Tungsten
Last Answer : (A) Chromium
Description : Stainless steel is welded with difficulty because of (A) Its high melting temperature (B) Chances of cracking (C) Oxide film formation (D) Chromium carbide formation
Description : Coke used for the production of calcium carbide should have (A) Low ash content (B) Low ignition temperature (C) High electrical resistivity (D) All (A), (B) and (C)
Description : Binding material used in cemented carbide tools is : (A) Nickel (B) Cobalt (C) Chromium (D) Silicon
Last Answer : Binding material used in cemented carbide tools is : Cobalt
Description : The main use of HCl is in the (A) Drilling of petroleum wells and pickling of steel sheets (B) Manufacture of cationic detergent (C) Treatment of spent fuel of nuclear reactor (D) None of these
Last Answer : (A) Drilling of petroleum wells and pickling of steel sheets
Description : Ball bearings are normally made of __________ steel. (A) High speed (B) High carbon (C) Chrome (D) Silicon
Last Answer : (C) Chrome
Description : How many of the given metals can be obtained by carbon reduction in their extractive metallurgy
Last Answer : How many of the given metals can be obtained by carbon reduction in their extractive metallurgy
Description : Which of the following are made out of the carbon steel having carbon content of 0.9 to 1%? (A) Small punches, broaches reamers and springs (B) Cutlery, screws, rivets and files (C) ... lathe tools and razors (D) Forgings like can shaft, structural steel plate, threading dies and drawing dies
Last Answer : (A) Small punches, broaches reamers and springs
Description : Carbon supply in pack carburising process is in the form of (A) Charcoal (B) Calcium carbide (C) Hydrocarbon oil (D) Graphite
Last Answer : (A) Charcoal
Description : For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved ... will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J
Last Answer : (C) 90,000 J
Description : Consider the following operations: 1. Drilling 2. Blasting 3. Mucking 4. Placing steel 5. Placing concrete The correct sequence of these operations in tunnel construction is (A) 1, 2, 4, 3, 5 (B) 1, 3, 2, 4, 5 (C) 1, 2, 3, 4, 5 (D) 1, 3, 4, 2,
Last Answer : (C) 1, 2, 3, 4, 5
Description : Which of the following alloy steels is the most suitable for making gun barrels and projectiles? (A) Tungsten steel (B) Molybdenum steel (C) Nickel-chrome steel (D) Cobalt steel
Last Answer : (C) Nickel-chrome steel