1. Which one of the following tool angle is provided to avoid rubbing of the body of the tool with the workpiece?
(a) Rake angle
(b) Helix angle
(c) Clearance angle
(d) None of the above
2. The negative rake angle is generally provided on the tool made of
(a) High speed steel
(b) Tool steel
(c) Tungsten carbide
(d) High carbon steel
3. Which one of the following is used only for finishing and maintaining correct form of thread ?
(a) Tap
(b) Threading tool
(c) Threading chaser
(d) Tipped tool
4. The chip breaker on a lathe tool is essential when
(a) Turning soft material
(b) Turning ductile materials and to break the chips
(c) Turning cast iron
(d) Turning hardened materials
5. A tool, which is used to enlarge a previously drilled hole is known as
(a) Facing tool
(b) Turning tool
(c) Form tool
(d) Boring tool
6. What effective change will occur to the tool geometry if the cutting tool is set
below the centre height on lathe?
(a) Front clearance angle increases
(b) Front clearance angle decreases
(c) Front clearance angle remains the same
(d) Front clearance angle becomes zero
7. Inserted HSS tool bits are more useful for the operation.
(a) Boring
(b) External threading
(c) Internal threading
(d) All the above
8. Which one of the following materials is used for manufacturing centre drills ?
(a) Cast steel
(b) Mild steel
(c) High speed steel
(d)Cast iron
9. Which among the following statements in respect of chasers is correct ?
(a) Chaser is a single point cutting tool
(b) Cutting threads by a chaser is slower process than that by a single point tool
(c) Cutting threads by chaser gives better finish
(d) The same chaser can be used for cutting any pitch of thread irrespective of the type of chaser used
10.Which among the following statements in respect of the lathe cutting tools is correct ?
(a) Red hotness temperature is higher for high carbon steel tool than that of
carbide tool
(b) The property of tool chipping off with vibration is more for cemented carbide
tools than that of HSS tools
(c) Ceramic tool has more resistance to shock as compared to HSS tool
(d) HSS tool can work at more spindle speed and feed than cemented carbide
tool
11. In the parting off tool which angle will help the tool to penetrate into the work without rubbing at the sides ?
(a) Top rake angle
(b) Front clearance angle
(c) Side clearance angle
(d) Back clearance angle
12.Which among the following statements in respect of chip breakers is correct ?
(a) Chip breakers are essential for breaking the long continuous chips into
small pieces
(b) Chip breakers are necessary to break the chips to protect the finished work
surfaces
(c) Chip breakers are provided to curl and break the chips
(d) All the above
13.Helix angle is found on
(a) feed rod of lathe
(b) threading tool
(c) threaded workpiece
(d) taper turning attachment
14. The width of the tool used to cut 10 mm pitch square thread is
(a) 10 mm
(b)7.5mm
(c) 5 mm
(d) 2.5 mm
15. The included angle of the countersinking portion of a centre drill of type 'B' used for protecting the centre hole is
(a) 75°
(b)90°
(c) 100°
(d)120°
16. Which one of the following factors will NOT influence the selection of the cutting speed ?
(a) Diameter of the workpiece
(b) Workpiece material
(c) Tool material
(d) Operation to be performed
17. Which one of the following angles of rough turning tool, depends upon the feed rate chosen ?
(a) Top rake angle
(b) Side rake angle
(c) Front clearance angle
(d) Side clearance angle
18. The size of the centre drill is selected on the basis of the
(a) length of the workpiece
(b) material of the workpiece
(c) diameter of the workpiece
(d) operation to be performed on the workpiece
19.Taps are surface treated to
(a) improve the appearance
(b) improve the wear resistance property
(c) prevent them from getting corroded
(d) be used only on automatic threading machines
20.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 ?
(a) Piece of sheet metal clamped to the holder in the path of the coil
(b) A step is ground on the throw away insert along the cutting edge
(c) A small groove ground at the cutting edge
(d) A carbide bit is screwed and held on the top face of the bit
21.To enable a nut to fit properly on a bolt of square threads, the width of the internal square threading tool should be
(a) slightly more than the half pitch
(b) slightly less than the half pitch
(c) equal to the half pitch
(d) equal to the pitch
22. The tip of a cemented carbide tool is joined on the shank by
(a) welding
(b) brazing
(c) soldering
(d) clamping with a screw
23. Which one of the following materials for lathe cutting tools can be forged to any desired shape ?
(a) High speed steel
(b) High carbon steel
(c) Stellite
(d) Tungsten carbide
24.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 ?
(a) Stop the power feed at intervals so that the chip breaks
(b) Change the rake angle
(c) Provide chip breaker on the tool
(d) Use a metal hook and pull away the chips
25.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 ?
(a) High speed steel
(b) High carbon steel
(c) Low alloy steel
(d) Cemented carbide
26.Which one of the following statements is true with reference to the tool life ?
(a) Time between starting and finishing a job
(b) Total time for turning work including regrinding of tool
(c) Time between two successive regrinds
(d) Time between starting of metal cutting and tool wear out
27.A carbide tipped tool with blue marking is used on a lathe. Which one of the following materials can be machined with this tool ?
(a) Brass
(b) Steel
(c) Plastic
(d) Grey cast iron
28.Hand chasers are used for
(a) quick production of threads
(b) cutting threads on soft metal directly
(c) rectifying threads cut on steel rods which are distorted
(d) rectifying crest and root of threads formed by single point tool
Answer Key –
1.c 2.c 3.c 4.b 5.d
6.a 7.d 8.c 9.c 10.b
11.d 12.d 13.c 14.c 15.d
16.a 17.d 18.c 19.b 20.d
21.a 22.b 23.b 24.c 25.d
26.c 27.b 28.c
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