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- Question
Crater wear is mainly due to the phenomenon known as
Options- A. adhesion of metals
- B. oxidation of metals
- C. diffusion of metals
- D. all of these
- Correct Answer
- diffusion of metals
- 1. The lip angle is the angle
Options- A. between the tool face and the ground end surface of flank
- B. made by the face of the tool and the plane parallel to the base of the cutting tool
- C. between the face of the tool and a line tangent to the machined surface at the cutting point
- D. none of the above Discuss
- 2. Fixtures are used
Options- A. for holding and guiding the tool in drilling, reaming or tapping operations
- B. for holding the work in milling, grinding, planing or turning operations
- C. to check the accuracy of workpiece
- D. none of the above Discuss
- 3. A tool used to withdraw a drill from the sleeve is called
Options- A. drill remover
- B. drill puller
- C. drift
- D. drill drawer Discuss
- 4. The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from
Options- A. 10 to 20 m/min
- B. 18 to 30 m/min
- C. 24 to 45 m/min
- D. 60 to 90 m/min Discuss
- 5. It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be
Options- A. 10 r.p.m.
- B. 20 r.p.m.
- C. 120 r.p.m.
- D. 180 r.p.m. Discuss
- 6. Flank wear depends upon the
Options- A. hardness of the work and tool material at the operating temperature
- B. amount and distribution of hard constituents in the work material
- C. degree of strain hardening in the chip
- D. all of these Discuss
- 7. The carbide tools operating at very low cutting speeds (below 30 m/min)
Options- A. reduces tool life
- B. increases tool life
- C. have no effect on tool life
- D. spoils the work piece Discuss
- 8. The abrasive recommended for grinding materials of low tensile strength is
Options- A. silicon carbide
- B. aluminium oxide
- C. sand stone
- D. diamond Discuss
- 9. The addition of lead, sulphur and phosphorus to low carbon steels, help to
Options- A. reduce built up edge
- B. break up chips
- C. improve machinability
- D. all of these Discuss
- 10. The cutting fluid mostly used for machining steel is
Options- A. water
- B. soluble oil
- C. dry
- D. heavy oils Discuss
Production Engineering problems
Search Results
Correct Answer: between the tool face and the ground end surface of flank
Correct Answer: for holding the work in milling, grinding, planing or turning operations
Correct Answer: drift
Correct Answer: 60 to 90 m/min
Correct Answer: 20 r.p.m.
Correct Answer: amount and distribution of hard constituents in the work material
Correct Answer: reduces tool life
Correct Answer: silicon carbide
Correct Answer: all of these
Correct Answer: soluble oil
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