171. The tool life is said to be over if September 13, 2025 by Admin poor surface finish is obtained there is sudden increase in cutting forces and power consumption overheating and fuming due to heat of friction starts all of the above ✅ The correct answer is option D.
172. In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called September 13, 2025 by Admin friction zone work-tool contact zone shear zone none of these ✅ The correct answer is option C.
173. The tool may fail due to September 13, 2025 by Admin cracking at the cutting edge due to thermal stresses chipping of the cutting edge plastic deformation of the cutting edge all of these ✅ The correct answer is option D.
174. The lathe centres are provided with standard taper known as September 13, 2025 by Admin Morse taper Seller’s taper Chapman taper Brown and Sharpe taper ✅ The correct answer is option A.
175. The taper on the lathe spindle is September 13, 2025 by Admin 1 in 10 1 in 15 1 in 20 1 in 30 ✅ The correct answer is option C.
176. A feed gear box for a screw cutting lathe is designed on the basis of September 13, 2025 by Admin geometric progression arithmetic progression harmonic progression none of these ✅ The correct answer is option A.
177. In lapping operaion, the amount of metal removed is September 13, 2025 by Admin 0.005 to 0.01 mm 0.01 to 0.1 mm 0.05 to 0.1 mm 0.5 to 1 mm ✅ The correct answer is option A.
178. Gears can be best produced on mass production by September 13, 2025 by Admin shaping casting forming hobbing ✅ The correct answer is option D.
179. The snag grinding is done September 13, 2025 by Admin to produce good surface finish and high degree of accuracy to remove considerable amount of metal without regard to accuracy of the finished surface to grind exterior cylindrical surfaces any one of the above ✅ The correct answer is option B.
180. Cutting fluid has no effect on the tool life. September 13, 2025 by Admin TRUE FALSE ✅ The correct answer is option B.