181. The cutting speed is minimum while machining __________ with a high speed steel tool.
cast iron
mild steel
brass
aluminium
✅ The correct answer is option A.
Production Engineering MCQs
182. Tool life is generally better when
grain size of the metal is large
grain size of the metal is small
hard constituents are present in the microstructure of the tool material
none of the above
✅ The correct answer is option A.
183. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
1.02
1.32
1.66
1.82
✅ The correct answer is option B.
184. Spot facing is an operation of smoothing and squaring the surface around a hole.
TRUE
FALSE
✅ The correct answer is option A.
185. Relief angles on high speed steel tools usually vary from
0° to 3°
3° to 10°
10° to 20°
20° to 30°
✅ The correct answer is option B.
186. The chuck used for setting up of heavy and irregular shaped work should be
four jaw independent chuck
three jaw universal chuck
magnetic chuck
drill chuck
✅ The correct answer is option A.
187. The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
helix or rake angle
point angle
chisel edge angle
lip clearance angle
✅ The correct answer is option A.
188. In continuous chip cutting, the maximum heat __________ the velocity of cutting.
depends upon
does not depend upon
✅ The correct answer is option A.
189. The factor considered for evaluation of machinability is
cutting forces and power consumption
tool life
type of chips and shear angle
all of these
✅ The correct answer is option D.
190. In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called
friction zone
work-tool contact zone
shear zone
none of these
✅ The correct answer is option A.