If a particular Fe-C alloy contains less than 0.83% carbon, it is called
High speed steel
Hypo eutectoid steel
Hyper eutectoid steel
Cast iron
Correct Answer :
B. Hypo eutectoid steel
Related Questions
In gear hobbing
Only hob rotates
Only gear blank rotates
Both hob and gear blank rotates
Neither hob nor gear blank rotates
For softer materials, the point angle of the drill is kept
Equal to 118°
Less than 118°
More than 118°
Any one of these
The enlarging of an existing circular hole with a rotating single point tool is called
Boring
Drilling
Reaming
Internal turning
Flank 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
Cutting edge only
Front face only
The guideways are of
Flat type
V-type
Dovetail type
Any one of these
The angle between the lathe centres is
30°
45°
60°
90°
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
Surface grinding is done to produce
Tapered surface
Flat surface
Internal cylindrical holes
All of these
Trepanning 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
The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
Helix or rake angle
Point angle
Chisel edge angle
Lip clearance angle
Match the items of List-I (Equipment) with the items of List-II (Process) and select the correct answer using the given codes.
| List-I (Equipment) | List-II (Process) |
|---|---|
| P. Hot Chamber Machine | 1. Cleaning |
| Q. Muller | 2. Core making |
| R. Dielectric Baker | 3. Die casting |
| S. Sand Blaster | 4. Annealing |
| . | 5. Sand mixing |
P-2, Q-1, R-4, S-5
P-4, Q-2, R-3, S-5
P-4, Q-5, R-1, S-2
P-3, Q-5, R-2, S-1
When the end of a tap is tapered for about three or four threads, it is known as a
Taper tap
Bottoming tap
Second tap
None of these
As tool and work are not in contact in EDM process
No relative motion occurs between them
No wear of tool occurs
No power is consumed during metal cutting
No force between tool and work occurs
The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is
(D - d)/2L
(D - d)/L
(D - d)/2
D - d
The tool life in case of a grinding wheel is the time
Between two successive regrinds of the wheel
Taken for the wheel to be balanced
Taken between two successive wheel dressings
Taken for a wear of 1 mm on its diameter
A single point tool has
Rake angle
Cutting angle
Lip angle
All of these
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 cutting force in up milling __________ per tooth movement of the cutter.
Is zero
Is maximum
Decreases from maximum to zero
Increases from zero to maximum
In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called
Friction zone
Work-tool contact zone
Shear zone
None of these
Larger end cutting edge angle _________ tool life.
Increases
Decreases
Does not effect
None of these
Which type of motor is not used in axis or spindle drives of CNC machine tools?
Induction motor
DC servo motor
Stepper motor
Linear servo motor
Chip breakers are used to
Increase tool life
Remove chips from bed
Break the chips into short segments
To minimise heat generation
Which of the following statement is correct in regard to centreless grinding?
The workpiece is supported throughout its entire length as grinding takes place.
It is a continuous process and adopted for production work.
It requires no holding device for the work.
All of the above
The angle on which the strength of the tool depends is
Rake angle
Cutting angle
Clearance angle
Lip angle
The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is
Feed rate, depth of cut, cutting speed
Depth of cut, cutting speed, feed rate
Cutting speed, feed rate, depth of cut
Feed rate, cutting speed, depth of cut
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
Larger than 15° side cutting edge angle
Increases tool life
Decreases tool life
Produces chipping and decreases tool life
Results in excessive stress concentration and greater heat generation
The method of grinding used to produce internal cylindrical holes and tapers, is
Internal cylindrical grinding
Form grinding
External cylindrical grinding
Surface grinding
Soft materials can not be economically ground due to
High temperature involved
Frequent wheel clogging
Rapid wheel wear
Low work piece stiffness
With the same tool life, the maximum material per minute is removed by
Increasing the cutting speed
Decreasing the cutting speed
Increasing the depth of cut
Increasing the feed rate