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Chapter:

6. Which of following position of tumbler gear lever set will move carriage towards headstock of la?

Up Middle Down None of the mentioned

Up

Tumbler gear lever in up position moves carriage towards headstock in a la machine.

Hint Answer

7. During groove cutting in a la, by using a parting tool, which of following forces are encountered?

Tangential Radial Tangential, Radial and Axial Tangential and Radial

Tangential, Radial and Axial

Radial, axial and tangential forces are encountered during groove cutting on a la machine.

Hint Answer

8. What will be value of half taper angle in degrees if diameter of big end is 100mm and diameter of small end is 60mm for a 1m long job?

3.19 5.29 1.14 2.29

1.14

Half angle can be calculated by using- tan (half taper angle) = (D-d)/ (2*L).

Hint Answer

9. Speed of lead screw decreases in relative to speed of spindle as many times required pitch is larger than pitch of lead screw.

True False

True

Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.

Hint Answer

10. Which of following is correct basis in designing feed gear box for screw cutting?

Geometric progression Arithmetic progression Logarithmic progression Harmonic progression

Geometric progression

Geometric progression is series of numbers having a common ratio. Feed gears box have ranges following geometric progression.

Hint Answer

11. Distance from one point of thread to next corresponding point is known as

Pitch Depth of threads Thread angle Major diameter

Depth of threads

Pitch is distance from one point of thread to next corresponding point.

Hint Answer

12. Which of following have a live centre?

Tail stock Headstock Tool post None of the mentioned

Headstock

Head stock has live centre and it is called live because spindle rotates here and is not at rest during machining.

Hint Answer

13. Which of followings is correct type of threads used in lead screw having half nut in la which is free to rotate in both directions?

ACME threads Buttress threads Whitworth threads V‐threads

ACME threads

ACME threads have greater efficiency than or profiles of threads and hence are used in lead screw.

Hint Answer

14. Which of following can be effectively used for holding irregular job?

Four jaw chuck Three jaw chuck Both three jaw chuck and four jaw chuck Two jaw chuck

Four jaw chuck

Four jaw chucks are used for holding irregular job because of good manual balancing capability of four jaws.

Hint Answer

15. In which of following, tail stock method of taper turning operation will be preferred more?

Internal tapers Steep tapers Small tapers Long slender tapers

Long slender tapers

For long slender tapers, tail stock over method is most suitable because tail stock method gives large space and large taper angle also.

Hint Answer

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Metal Cutting

Cutting-Tool Materials and Cutting Fluids

Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

Lathe Machines, Shaping and Slotting

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Grinding, Surface Finishing Operations and Unconventional Machining Processes

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Powder Metallurgy, NC Part Programming and Metal Casting and Gating Systems

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Forming, Metal Forming Processes and Heat Transfer

Forming, Metal Forming Processes and Heat Transfer

Jigs and Fixture, Applications and Gears

Jigs and Fixture, Applications and Gears

Topics

This Chapter consists of the following topics

Lathe Machines

Shaping and Slotting

Which of following position of tumbler gear lever set will move carriage towards headstock of la?

During groove cutting in a la, by using a parting tool, which of following forces are encountered?

What will be value of half taper angle in degrees if diameter of big end is 100mm and diameter of small end is 60mm for a 1m long job?

Speed of lead screw decreases in relative to speed of spindle as many times required pitch is larger than pitch of lead screw.

Which of following is correct basis in designing feed gear box for screw cutting?

Distance from one point of thread to next corresponding point is known as

Which of following have a live centre?

Which of followings is correct type of threads used in lead screw having half nut in la which is free to rotate in both directions?

Which of following can be effectively used for holding irregular job?

In which of following, tail stock method of taper turning operation will be preferred more?

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