The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
Ceramic
Stellite
Diamond
Cemented carbide
Correct Answer :
B. Stellite
Related Questions
The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
Ceramic
Stellite
Diamond
Cemented carbide
The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.
Mild steel
Copper
Aluminium
Brass
The grinding wheel speed (surface speed in m/min) usually varies from
500 to 1000
1000 to 1500
1500 to 2000
2000 to 2500
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
If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
ARC
Short ARC
ARC length
ARC blow
The velocity of tool along the tool face is known as
Shear velocity
Chip velocity
Cutting velocity
Mean velocity
The lip angle of a single point tool is usually
20° to 40°
40° to 60°
60° to 80°
None of these
The angle between the shear plane and __________ is called shear angle.
Work surface
Tool face
Machine surface
None of these
The cutting force in punching and blanking operations mainly depends on
The modulus of elasticity of metal
The shear strength of metal
The bulk modulus of metal
The yield strength of metal
Crater wear leads to
Increase in cutting temperature
Weakening of tool
Friction and cutting forces
All of these
Larger end cutting edge angle _________ tool life.
Increases
Decreases
Does not effect
None of these
Quality screw threads are produced by
Thread milling
Thread chasing
Thread cutting with single point tool
Thread casting
Relief angles on high speed steel tools usually vary from
0° to 3°
3° to 10°
10° to 20°
20° to 30°
The angle between the face and flank of the single point cutting tool is known as
Rake angle
Clearance angle
Lip angle
Point angle
The grade of grinding wheel depends upon
Hardness of the material being ground
Speed of wheel and work
Condition of grinding machine
All of these
A push broach as compared to pull broach
Has less number of teeth
Is short and stocky
Removes less material for each pass of the tool
All of the above
When the cutting edge of the tool is dull, then during machining
Continuous chips are formed
Discontinuous chips are formed
Continuous chips with built-up edge are formed
No chips are formed
The maximum production of small and slender parts is done by
Watch maker's lathe
Sliding head stock automatic lathe
Multi-spindle automatic lathe
Capstan lathe
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
In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.
Up milling
Down milling
Face milling
End milling
The operation of making a cone-shaped enlargement of the end of a hole is known as
Counter-sinking
Counter-boring
Trepanning
Spot facing
In drilling softer materials, the cutting speed is _________ as compared to harder materials.
Same
Low
High
None of these
The size of abrasive grain required in a grinding wheel depends upon the
Amount of material to be removed
Hardness of material being ground
Finish desired
All of these
The cutting speed is minimum while machining _________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is
0.20
0.30
0.50
0.60
In order to prevent tool from rubbing the work _________ on tools are provided.
Rake angles
Relief angles
Face angles
None of these
The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
Equal to
Less than
More than
None of these
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
Crater wear is mainly due to the phenomenon known as
Adhesion of metals
Oxidation of metals
Diffusion of metals
All of these
The soft grade grinding wheels are denoted by the letters
A to H
I to P
Q to Z
A to P