B/Choose correct answer from the following (choose 5 only):1. The iron ore mostly used for the production of pig Iron is:b) Hematite c) Bauxitea) Cuprited) Bornite2. In TIG are welding, the welding zone is shielded by an atmosphere ofa. Heliumb) Hydrogenc) Nitrogen3. A moving mandrel is used in:a) wire drawingb) tube drawingc) metal cuttingd) forging4. The operation of producing Pepsi cans is known as:a) impact extrusion b) direct extrusionc) sizingd) indirect extrusion5. Which of the following is used to form Complex shapes such as carburetor:a) centrifugal casting b) sand casting c) powder metallurgy d) pressure die casting6. Which one of the cutting tools are make by powder metallurgy.a) Phosphor Bronzeb) carbidesc) tool steeld) diamondd) Acetylene

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B/ Choose correct answer from the following (choose 5 only): 1. The iron ore mostly used for the production of pig Iron is: b) Hematite a) Cuprite c) Bauxite d) Bornite 2. In TIG arc welding, the welding zone is shielded by an atmosphere of: a. Helium b) Hydrogen c) Nitrogen 3. A moving mandrel is used in: a) wire drawing b) tube drawing c) metal cutting d) Acetylene d) forging

B/ Choose correct answer from the following (choose 5 only): 1. The iron ore mostly used for the production of pig Iron is: b) Hematite a) Cuprite c) Bauxite d) Bornite 2. In TIG arc welding, the welding zone is shielded by an atmosphere of: a. Helium b) Hydrogen c) Nitrogen 3. A moving mandrel is used in: a) wire drawing b) tube drawing c) metal cutting d) Acetylene d) forging

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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8) Consider the following statements regarding the Resistance micro-welding: A: Higher contact resistance is observed in resistance micro-welding compared to large- scale resistance welding. R: The electrode pressure is much lower in micro-welding. a. Both A and Rare correct, and R is the correct reasoning of A. b. Both A and R are correct, and R is not the correct reasoning of A. c. Only A is correct, and R is incorrect. d. Only R is correct, and A is incorrect.
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2.8 Advantages of Submerged Arc Welding Cost per unit length of joint is relatively low The arc is under a blanket of flux, which virtually eliminates arc flash, spatter, and fume. • Extremely high deposition rates and welding speeds are possible. • Sound welds are readily made (with good process design and control). High current densities increase weld penetration and decrease the need for edge preparation. High speed welding of thin sheet steels at over 2.5 m/min is possible. Can be easily Automated Minimum welder training is required (relatively unskilled welders can be employed). • Low hydrogen weld deposits can be produced. • The flux acts as a scavenger and deoxidizer to remove contaminants such as oxygen, nitrogen, and sulphur from the molten weld pool. This helps to produce sound welds with excellent mechanical properties. 26 2.9 Limitations of Submerged Arc Welding Initial cost of wire feeder, power supply, controls, and flux-handling equipment is high. Limited to ferrous…
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