MCQ Thread AND GEAR Generation PDF

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MCQ THREAD AND GEAR GENERATION 1. Thread rolling is restricted to [1992] (a) ferrous materials (b) ductile materials (c) hard materials (d) none of the above Solution: (b) 2. The blank diameter used in thread rolling will be [1989] (a) equal to the major diameter of the thread (b) equal to the pitch diameter of the thread (c) little higher than the minor diameter of the thread (d) little higher than the pitch diameter of the thread Solution: (b) Here the thread is made by Rolling process which is metal forming process. In this process volume will remains constant. Hence diameter of rod will be equal to pitch diameter. Hence, the correct option is (b). 3. Teeth of internal spur gears can be accurately cut in a [1989] (a) milling machine (b) gear shaping machine (c) slotting machine (d) hobbing machine Solution: (b) The best method for making internal gear tooth is gear shaping followed by broaching. Hence, the correct option is (b). 4. Gear hobbing produces more accurate gears than milling because in hobbing [1989] (a) there is a continuous indexing operation (b) pressure angle is larger than in milling (c) hob and work piece both are rotating (d) a special multi-tooth cutter (hob) is used Solution: (a) For gear hobbing, errors can be reduced with the help of indexing. Hence, the correct option is (a). 5. Internal gear cutting operation can be performed by [2008] (a) milling (b) shaping with rack cutter (c) shaping with pinion cutter (d) hobbing Solution: (b) Gear shaping is used to produce internal gears and next best method is broaching. Hence, the correct option is (b). 6. Reaming is primarily used for achieving [2007] (a) higher MRR

(b) improved dimensional tolerance (c) fine surface finish (d) improved positional tolerance Solution: (b) Regarding finish existing hole. Hence, the correct option is (b). 7. Which of following gear manufacturing processes is based on generation principle? [2007] (a) Gear hobbing (b) Gear shaping (c) Gear milling (d) Gear shaving Solution: (a)...