Choose the right variant. 1. Machine tools are powered mechanical devices that are generally used1. Machine tools are powered mechanical devices that are generally used… a) to make manufactured parts (components) in various ways that include cutting or certain other kinds of deformation. b) to manufacture metal components of machines by selectively cutting and removing metal. c) for cutting, shaping, and finishing metals or other materials. d) all of the mentioned above. 2. Today, machine-tools are powered by electricity and can be operated… a) manually. b) under automatic control. c) manually, or under automatic control. 3. Drilling machines are used… a) to cut internal cylinders into metal parts. b) for drilling holes up to several inches in diameter or several feet deep. c) for boring holes, having a stand and work table with facilities for lowering the tool to the workpiece. d) all of the mentioned above. 4. Lathes are versatile machine tools… a) especially adapted for reducing the outside diameters of cylindrical work. b) which perform an operation called turning. c) capable of drilling, boring, thread cutting, and other operations. d) all of the mentioned above. 5. The lathe is… a) a machine tool used principally for shaping pieces of metal by causing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the work causing the cutting action. b) a machine in which work is rotated about a horizontal axis and shaped by a fixed tool. c) a machine for shaping wood, metal etc, which turns the piece of wood etc which is to be shaped round and round against a tool held steady by the operator.
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