A better machinable metal is one which gives
Lower chip-tool contact area and larger shear angle
Higher chip-tool contact area and smaller shear angle
Lower chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle
Correct Answer :
A. Lower chip-tool contact area and larger shear angle
Related Questions
The strength of a brazed joint
Decreases with increase in gap between the two joining surfaces
Increases with increase in gap between the two joining surfaces
Decreases up to certain gap between the two joining surfaces beyond which it increases
Increases up to certain gap between the two joining surfaces beyond which it decreases
The increase in depth of cut and feed rate __________ surface finish.
Improves
Deteriorates
Does not effect
None of these
The type of tool used on milling machine and broaching machine is
Single point cutting tool
Two point cutting tool
Three point cutting tool
Multipoint cutting tool
The usual value of the helix angle of a drill is
20°
30°
45°
60°
Crater wear occurs mainly on the
Nose part, front relief face and side relief face of the cutting tool
Face of the cutting tool at a short distance from the cutting edge only
Cutting edge only
Front face only
The average cutting speed for turning brass with a high speed steel tool is
15 to 19 m/min
25 to 31 m/min
60 to 90 m/min
90 to 120 m/min
In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops / sec or less, what is this known as
Globular transfer
Spray transfer
GMAW practice
Dip transfer
Crater wear is predominant in
Carbon tool steels
Tungsten carbide tools
High speed steel tools
Ceramic tools
Stellite preserves hardness upto a temperature of
350°C
500°C
900°C
1100°C
The taper on the lathe spindle is
1 in 10
1 in 15
1 in 20
1 in 30
In hot machining, tool is made of
Tungsten carbide
Brass or copper
Diamond
Stainless steel
A fine grained grinding wheel is used to grind
Hard and brittle materials
Soft and ductile materials
Hard and ductile materials
Soft and brittle materials
The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called
Truing
Dressing
Facing
Clearing
The cutting angle of a flat drill varies from
3° to 8°
20° to 30°
60° to 90°
90° to 120°
In a shaper
Tool is stationary and work reciprocates
Work is stationary and tool reciprocates
Tool moves over stationary work
Tool moves over reciprocating work
In the relation VTn = C, the value of n for carbide tools is
0.1 to 0.2
0.20 to 0.25
0.25 to 0.40
0.40 to 0.55
Slow speed of the spindle is necessary in
Thread cutting
Turning a work of larger diameter
Turning a hard or tough material
All of these
The chamfering is an operation of
Bevelling the extreme end of a workpiece
Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Enlarging the end of a hole cylindrically
If the cutting speed is increased, then the built-up-edge
Becomes longer
May or may not form
Becomes smaller and finally does not form at all
Has nothing to do with speed
A tool used to withdraw a drill from the sleeve is called
Drill remover
Drill puller
Drift
Drill drawer
In oblique cutting system, the cutting edge of the tool
May clear the width of the workpiece
May or may not clear the width of the workpiece
May not clear the width of the workpiece
Should always clear the width of the workpiece
Thread grinding requires work speed from
1 to 3 m/min
5 to 10 m/min
10 to 14 m/min
14 to 20 m/min
A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
0.2 mm
10 mm
20 mm
100 mm
Lapping is an operation of
Making a cone-shaped enlargement of the end of a hole
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Which of the following statement is correct as regard to up milling?
It cannot be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.
An open structure of a grinding wheel is used for
Soft materials
Tough materials
Ductile materials
All of these
The rake angle of a single point cutting tool corresponds to _________ of a twist drill.
Lip clearance angle
Helix angle
Point angle
Chisel edge angle
When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is
7
8
9
10
The tail stock set over method of taper turning is preferred for
Internal tapers
Small tapers
Long slender tapers
Steep tapers
In electro discharge machining, tool is made of
Brass
Copper
Copper tungsten alloy
All of these