Porosity
Undercut
Under fill
Crack
A. Porosity
Increase in coefficient of friction
Decrease in coefficient of friction
Decrease in roll radius
Decrease in roll velocity
Equal to
Less than
Greater than
None of these
1.02
1.32
1.66
1.82
120
170
180
240
Depth of cut
Cutting speed
Feed
All of these
Brittle metals
Ductile metals
Hard metals
Soft metals
Tungsten
Chromium
Silicon
Cobalt
3° to 8°
20° to 30°
60° to 90°
90° to 120°
Water
Soluble oil
Dry
Sulphurised mineral oil
Helix or rake angle
Point angle
Chisel edge angle
Lip clearance angle
Internal cylindrical grinding
Form grinding
External cylindrical grinding
Surface grinding
Gas metal arc welding
Submerged arc welding
Gas tungsten arc welding
Flux coated arc welding
Soft grade
Medium grade
Hard grade
None of these
Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of the above
Tool is stationary and work reciprocates
Work is stationary and tool reciprocates
Tool moves over stationary work
Tool moves over reciprocating work
Brinell hardness number
Rockwell hardness number
Vickers pyramid number
Letter of alphabet
Internal tapers
Small tapers
Long slender tapers
Steep tapers
Work surface
Tool face
Machine surface
None of these
Increases
Decreases
Does not effect
None of these
Spindle
Arbor
Column
Knee
It can not 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.
High speed steel
Hypo eutectoid steel
Hyper eutectoid steel
Cast iron
10 to 20 m/min
18 to 30 m/min
24 to 45 m/min
60 to 90 m/min
Fusion
Reverse polarity
Forward welding
Direct polarity
At recrystallization temperature
Between 100⁰C to 150⁰C
Between recrystallization temperature
Above recrystallization temperature
70°
100°
118°
130°
Has less number of teeth
Is short and stocky
Removes less material for each pass of the tool
All of the above
1, 2, 2
1, 2, 4
2, 3, 4
2, 4, 4
Increase in cutting temperature
Weakening of tool
Friction and cutting forces
All of these
Materials
Types of gears
Number of teeth
Width of gears