Discussion
Home ‣ Mechanical Engineering ‣ Production Engineering Comments
- Question
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.
- Correct Answer
- 20 r.p.m.
- 1. If the cutting speed is increased, then the built-up-edge
Options- A. becomes longer
- B. may or may not form
- C. becomes smaller and finally does not form at all
- D. has nothing to do with speed Discuss
- 2. Cemented carbide tools are generally poor in shear.
Options- A. Yes
- B. No Discuss
- 3. The infeed grinding is similar to plunge grinding.
Options- A. Yes
- B. No Discuss
- 4. Which of the following statement is wrong as regard to down milling?
Options- A. It can not be used on old machines due to backlash between the feed screw of the table and the nut.
- B. The chips are disposed off easily and do not interfere with the cutting.
- C. The surface milled appears to be slightly wavy.
- D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. Discuss
- 5. An operation of enlarging the end of a hole cylindrically is known as grooving.
Options- A. Correct
- B. Incorrect Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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 Discuss
Production Engineering problems
Search Results
Correct Answer: becomes smaller and finally does not form at all
Correct Answer: Yes
Correct Answer: Yes
Correct Answer: The surface milled appears to be slightly wavy.
Correct Answer: Incorrect
Correct Answer: 60 to 90 m/min
Correct Answer: drift
Correct Answer: for holding the work in milling, grinding, planing or turning operations
Correct Answer: between the tool face and the ground end surface of flank
Correct Answer: diffusion of metals
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.