MANUFACTURING AND PRODUCTION TECHNOLOGY MULTIPLE CHOICE QUESTIONS
Q51. The average cutting speed with drill of high speed steel is
(a) half the cutting speed with drill of carbon steel
(b) equal to the cutting speed with drill of carbon steel
(c) twice the cutting speed with drill of carbon steel
(d) thrice the cutting speed with drill of carbon steel.
Q52. For drilling cast iron, the lubricant used
(b) soda water
Q53. The best angle to grind a drill for work on extremely hard material is
Q54. The best angle to grind a drill for work on soft material like fibre is
Q55. With the increase of helix angle, the cutting edge becomes
(d) none of the above.
Q56. For harder material, helix angles are of the order of
(a) 50 to 60°
(b) 35 to 45°
(c) 20 to 30°
(d) 10 to 13°.
Q57. Choose the wrong statement
(a) Drilling is an example of oblique cutting.
(b) The lead screw of a lathe has multi-start threads.
(c) In drilling operation, the metal is removed by shearing and extrusion.
(d) A 20 mm drilling machine means that it can drill a hole of maximum diameter 20 mm.
Q58. A drill consists of a cylindrical piece of steel with special grooves. These grooves are generally called
Q59. High helix drills are having helix angles of
(a) 10 to 15°
(b) 20 to 30°
(c) 35 to 40°
(d) 50 to 70°.
Q60. High helix drills are used for deep-hole drilling in
(a) hard rubber
(c) fibre asbestos
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