LATHE MACHINE MCQ 4

1) Chip breakers are meant to break continuous long chips. Which one of the following types of chip breakers is found on a throw away insert with holder?

Piece of sheet metal clamped to the holder in the path of the coil

A small groove ground at the cutting edge

A step is ground on the throw away insert along the cutting edge

A carbide bit is screwed and held on the top face of the bit

2) The tip of a cemented carbide tool is joined on the shank by

welding

brazing

soldering

clamping with a screw

3) To enable a nut to fit properly on a bolt of square threads, the width of the internal square threading tool should beprovided on the tool made of …………..

slightly more than the half pitch

slightly less than the half pitch

equal to the half pitch

equal to the pitch

4) Which one of the following materials for lathe cutting tools can be forged to any desired shape?

Tungsten carbide

High speed steel

High carbon steel

Stellite

5) When rough turning a workpiece with a carbide tool long curly chips are formed. Which one of the following is the right way of getting rid of this kind of chip?

Provide chip breaker on the tool

Use a metal hook and pull away the chips

Change the rake angle

Stop the power feed at intervals so that the chip breaks

6) A brass shaft is to be turned to a surface roughness Ra = 0.8, with high cutting speed. Which one of the following cutting tool materials is most suitable? centre height on lathe?

High carbon steel

Low alloy steel

High speed steel

Cemented carbide

7) Which one of the following statements is true with reference to the tool life?

Time between starting and finishing a job

Total time for turning work including regrinding of tool

Time between two successive regrinds

Time between starting of metal cutting and tool wear out

8) A carbide tipped tool with blue marking is used on a lathe. Which one of the following materials can be machined with this tool?

Plastic

Grey cast iron

Steel

Brass

9) Hand chasers are used for

rectifying crest and root of threads formed by single point tool

quick production of threads

cutting threads on soft metal directly

rectifying threads cut on steel rods which are distorted

10) The included angle of the countersinking portion of a centre drill of type ‘B’ used for protecting the centre hole is

75°

90°

100°

120°

11) Which one of the following is the correct position of threading tool to cut V-thread?

Exactly at centre height of the workpiece with tool axis perpendicular to the workpiece axis

Exactly at centre height of the workpiece with tool axis at 60° to the workpiece axis

Exactly at centre height of the workpiece with tool axis at 45° to the workpiece axis

Exactly at centre height of the workpiece with tool axis at 45° to the workpiece axis

12) Which among the following statements is suitable to get better finish by turning?

Increase the speed and feed

Reduce the speed and feed

Increase the speed and reduce the feed

Increase the feed and reduce the speed

13) For plain turning a 60 mm diameter workpiece using HSS tool with recommended cutting speed of 30 metre / min., the rpm should be

80 rpm

159 rpm

192 rpm

318 rpm

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14) Which among the following factors governs the selection of feed when turning a workpiece?

Tool geometry

Surface finish required

Type of coolant required

All of the above

15) Which one of the following shoulders is used on components to be threaded?

Undercut shoulder

Radius shoulder

Beveled shoulder

Square shoulder

16) Which range of cutting speed is set for turning a mild steel using HSS tool?

15—20m/min

35—50m/min

50—80m /mm

70—100m/mm

17) Which one of the following combination of movements is used to turn a ball on a centre lathe with single point tool ?

Carriage and compound slides are used

Cross slide and compound slides are used

Carriage and cross slide are used

Compound slide and apron are used

18) State the direction of rotation of job and lead screw while cutting left hand thread viewing from tailstock end. (CW = clockwise; ACW = anticlockwise).

Both the job and lead screw rotate CW

Both the job and lead screw rotate ACW

Job rotates CW and lead screw rotates ACW

Job rotates ACW and lead screw rotates CW

19) Counter boring is done for

deburring hole ends

enlarging holes to accurate size

finishing cored holes

accommodating socket head screws

20) Fine facing is done by feeding the tool

from centre to the periphery of the job

from periphery to the centre of the job

either ‘a’ or ‘b’

neither ‘a’ nor ‘b’