Engineering Materials & Mechanical Properties - Quiz Answers

97. SAE 51XXX belongs to the _______ steel family. A. Carbon B. Chromium C. Manganese D. Nickel Answer: B 98. In itself, it is a lubricant and usually one of the important elements in casting nonferrous metals like bronze, for example. A. Antimony B. Babbitt C. Lead D. Zinc Answer: C 99. Gasket material, which should avoid hot liquid/steam applications? A. Asbestos fiber B. Nylon fiber C. Rubberized D. Wool Answer: C 100. The same material properties all over/direction and at any particular point in a structural member is: A. Heterogeneous B. Homogeneous C. Isentropic D. Isotropic Answer: D ELEMENTS 6 1. The recommended value of the rake angle for machining aluminum with cutting tools made up of cemented carbide tool A. 5o B. 10o o C. 15 D. 25o Answer: C 2. Laser beam machining process is used to machine A. Thicker materials B. Thinner materials C. Heavier materials D. Stronger materials Answer: B 3. The size of abrasive grains in abrasive a jet machining varies from A. 60 to 100 microns B. 10 to 50 microns C. 1 to 5 microns D. 20 to 40 microns Answer: B 4. In collet, the included angle of taper is usually A. 10o B. 20o o C. 30 D. 40o Answer: C 5. Straight fluted drill are used to drill ______ materials. A. Soft B. Hard C. Thin D. Thick Answer: A 6. Twist drills are made usually considered suitable machining holes having a length less than A. Two times their diameter B. Five times their diameter C. Ten times their diameter D. Twenty times their diameter Answer: B 7. A hard grade grinding wheel is suitable for grinding A. Hard materials B. Soft materials C. Both materials D. None of these Answer: B 8. The relative motion of work piece in planning is A. Rotary B. Translatory C. Rotary and translatory D. None of these Answer: B 9. The accuracy obtained by the grinding process can be of the order of A. 0.25 mm B. 0.025 mm C. 0.0025 mm D. 0.00025 mm Answer: D 10. In quick return mechanism of shaping machine, the ram stroke length is proportional to A. Slotter arm length B. Crank length C. Ram length D. None of these Answer: B 11. A white metal, almost as bright as silver and is malleable and ductile and can be welded. A. Nickel B. Aluminum C. White iron D. Lead Answer: A 12. It is a silver dull, soft metal and the second lightest of all metals used in the industry. A. Nickel B. Aluminum C. White iron D. Lead Answer: B 13. The least among iron ores for it contains many impurities, poor in iron content and commonly used in England. A. Hematite B. Magnetite C. Limanite D. Siderite Answer: D 14. Which of the following is not considered to be precious metal? A. Silver B. Gold C. Platinum D. Steel Answer: D 15. It is an alloy of copper and zinc. It is approximately 1/3 zinc and 2/3 copper. A. Brass B. Bronze C. Muntz metal D. Silver Answer: A 16. It is a copper tin alloy and is named either bell metal or brown metal. A. Brass B. Bronze C. Muntz metal D. Silver Answer: B 17. It is a furnace that converts pig iron steel by oxidizing out the surplus carbon and using oxygen by throwing raw iron ore into the furnace. A. Open-hearth furnace B. Electric furnace C. Cupola D. Bessemer Answer: A 18. The most commonly used series in the bulk production of bolts, screws, nuts and other general applications in the coarse-thread series. A. UNC B. UNF C. White iron D. Lead Answer: A 19. What is the actual torque ratio of a gear set divided by its gear ratio? A. Approach ratio B. Clearance C. Contact ratio D. Efficiency Answer: D 20. Which of the following has low coefficient of expansion, corrosion resistant, weak in strength and used for non-ferrous application as an alloying element? A. Aluminum B. Aluminum oxide C. Copper oxide D. Copper Answer: A 21. The usual ratio of forward and return stroke in quick return mechanism of shaping machine is A. 3:2 B. 3:1 C. 3:4 D. 3:5 Answer: A 22. The amount of metal removed by honing process is less than A. 0.125 mm B. 0.225 mm C. 0.325 mm D. 0.425 mm Answer: A 23. In ECM process thermal current requirement is A. 100 amps/cycle of work piece area B. 200 amps/cycle of work piece area C. 500 amps/cycle of work piece area D. 800 amps/cycle of work piece area Answer: D 24. The voltage applied between tool (cathode) and work piece (anode) in ECM process is A. 30 – 50 V B. 60 – 90V C. 3 – 20 V D. None of these Answer: C 25. The diameter (D) of a plain milling cutter is approximately related to arbor diameter (d) as A. D = 1.5d to 2d B. D = 2.5d to 3d C. D = 4.5d to 6d D. D = 5.5d to 8d Answer: B 26. The type and number of bearings to be used for spindles of machine tool depend on the A. Type of spindle B. Type of machine tool C. Load on the bearing D. None of these Answer: C 27. HSS cutting tools are generally provided with A. Positive rake angle B. Negative rake angle C. Positive cutting edge angle D. Negative cutting edge angle Answer: A 28. Cemented carbide and ceramic cutting tools are usually provided with A. Positive rake angle B. Negative rake angle C. Positive cutting edge angle D. Negative cutting edge angle Answer: B 29. Coefficient of friction in anti-friction guide ways is: A. High B. Low C. Medium D. None of these Answer: B 30. Nitriding process of surface treatment for steel tools is used for taking A. Light cuts B. Heavy cuts C. Medium cuts D. None of these Answer: A 31. Which of the following material(s) is recommended for large sprocket of large speed ratio and having fewer engagement? A. Nickel-chromium steel B. Copper C. Cast iron D. Aluminum Answer: C 32. In which of the following carrying capacity where roller bearing is utilized better than ball bearing? A. Heavy load B. High temperature load C. Low load D. Reversing load Answer: A 33. Which of the following materials having thermal expansion of about 10 times higher than those of metals and has more heat generated during machining? A. Aluminum B. Asbestos C. Plastic D. PVC Answer: C 34. To avoid scoring in the bearing surface and the shaft due to contamination/absorption of the fine dirt in the bearing during operation/lubrication the bearing material to apply should have good ____ properties. A. Anti-scoring B. Corrosion resistance conformability C. Corrosion resistance D. Embeddability Answer: D