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Chapter:

21. Which of following arrangement is used in movement of carriage along ways?

Rack and pinion Spindle mechanism Crank and slotted lever mechanism None of the mentioned

Rack and pinion

Rack and pinion mechanism is used in movement of carriage by flywheel. Rack is gear of finite diameter.

Hint Answer

22. In surface finishing operation one should use a sharp tool with a feed and _ Speed of rotation of job.

Minimum, minimum Minimum, maximum Maximum, maximum Maximum, minimum

Minimum, maximum

Minimum feed and maximum speed of rotation gives very small material removal rate and hence used for surface finishing operation.

Hint Answer

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

True False

False

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

Hint Answer

24. Which of following serves as a housing for driving pulley, and back gears?

Headstock Tailstock Tool Post None of the mentioned

Tailstock

Headstock has driving pulleys and back gears in la machine. Headstock also carries spindle and chuck for holding work piece.

Hint Answer

25. The job of total length 300mm is tapered turned on la using tailstock set over method. The two diameters obtained are 80mm and 500mm and length of taper was 200mm only. Tail stock set over is equal to

10 15 20 25

15

Tail stock set over= L*(D-d)/ (2*l), where ‘D’ is external diameter, ‘d’ is internal diameter, ‘L’ is length of job.

Hint Answer

26. Self centered chuck has ___ number of jaws.

10 1 2 3

3

3-jaw chucks are also known as self centered chuck, hence y have 3 jaws.

Hint Answer

27. What will be value of half taper angle in degrees if diameter of big end is 500mm and diameter of small end is 60mm for a 1m long job?

31.10 52.30 31.10 12.40

12.40

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

Hint Answer

28. Let screw of 2mm pitch is needed to be cut on la machine. Lead screw of la has pitch of 6mm. Which of following statement is correct?

Speed of lead screw> speed of spindle Speed of lead screw< speed of spindle Speed of lead screw=speed of spindle None of the mentioned

Speed of lead screw< speed of spindle

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

Hint Answer

Previous

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Magnetic Properties of Material, Electrical Properties of Materials, Plastics, Ceramics and Composites

Magnetic Properties of Material, Electrical Properties of Materials, Plastics, Ceramics and Composites

Metal Cutting

Cutting-Tool Materials and Cutting Fluids

Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

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Grinding, Surface Finishing Operations and Unconventional Machining Processes

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Forming, Metal Forming Processes and Heat Transfer

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Topics

This Chapter consists of the following topics

Lathe Machines

Shaping and Slotting

Which of following arrangement is used in movement of carriage along ways?

In surface finishing operation one should use a sharp tool with a feed and _ Speed of rotation of job.

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

Which of following serves as a housing for driving pulley, and back gears?

The job of total length 300mm is tapered turned on la using tailstock set over method. The two diameters obtained are 80mm and 500mm and length of taper was 200mm only. Tail stock set over is equal to

Self centered chuck has ___ number of jaws.

What will be value of half taper angle in degrees if diameter of big end is 500mm and diameter of small end is 60mm for a 1m long job?

Let screw of 2mm pitch is needed to be cut on la machine. Lead screw of la has pitch of 6mm. Which of following statement is correct?

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