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Quiz 4
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Q.1
High speed steel tools retain their hardness up to a temperature of
250°C
350°C
500°C
900°C
Q.2
Glazing in grinding wheels __________ cutting capacity.
Has no effect on
Increase
Decrease
None of these
Q.3
Ceramic cutting tools are
Made by cold pressing of aluminium oxide powder
Available in the form of tips
Brittle and have low bending strength
All of these
Q.4
For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
50°C
100°C
175°C
275°C
Q.5
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
Q.6
The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)
VnT = C
VTn = C
Vn/T = C
V/Tn = C
Q.7
In centreless grinding, work place centre will be
Above the line joining the two wheel centres
Below the line joining the two wheel centres
On the line joining the two wheel centres
At the intersection of the line joining the wheel centres with the work place plane
Q.8
In down milling, the thickness of chip is
Minimum at the beginning of the cut and maximum at the end of the cut
Maximum at the beginning of the cut and minimum at the end of the cut
Uniform throughout the cut
None of these
Q.9
What is the type of welding defect is caused due to stresses on heating and cooling called?
Incomplete penetration
Shrinkage void
Slag Entrapment (Inclusions)
Incomplete fusion
Q.10
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
Q.11
In up milling, the thickness of chip is
Minimum at the beginning of the cut and maximum at the end of the cut
Maximum at the beginning of the cut and minimum at the end of the cut
Uniform throughout the cut
None of these
Q.12
A bottoming tap has
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
Q.13
Which of the following statement is correct about nose radius?
It improves tool life
It improves the surface finish
Both (A) and (B)
None of these
Q.14
An expendable pattern is used in
Slush casting
Squeeze casting
Centrifugal casting
Investment casting
Q.15
High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
One-half
One-fourth
Double
Four times
Q.16
A fixture is defined as a device which
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
Is used to check the accuracy of workpiece
All of the above
Q.17
Which of the following statement is wrong about ultrasonic machining?
It is best suited for machining hard and brittle materials.
It cuts materials at very slow speeds
It removes large amount of material
It produces good surface finish
Q.18
Gears can be best produced on mass production by
Shaping
Casting
Forming
Hobbing
Q.19
In drilling brass, a drill with
Zero helix angle is used
Low helix angle is used
High helix angle is used
Any helix angle can be used
Q.20
Which of the following statement is wrong?
The larger side rake angle produces chipping
The smaller rake angle produces excessive wear and deformation in tool
The increase in nose radius decreases tool life
Q.21
The top and sides of the table of a shaper usually have
L-type slots
T-type slots
I-type slots
Any one of these
Q.22
When the shear angle is small
Path of shear is short and chip is thin
Path of shear is large and chip is thick
Path of shear is short and chip is thick
Path of shear is large and chip is thin
Q.23
In metal cutting operations, the shear angle is the angle made by the shear plane with the
Direction of the tool axis
Direction of tool travel
Perpendicular to the direction of the tool axis
Central plane of the workpiece
Q.24
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
Q.25
A jig is defined as a device which
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
Is used to check the accuracy of workpiece
All of the above
Q.26
The point angle of a drill, for drilling stainless steel, is
90°
118°
135°
150°
Q.27
In American Standard Association (ASA) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then the side rake angle will be
5°
6°
8°
10°
Q.28
Chip breakers are used to
Increase tool life
Remove chips from bed
Break the chips into short segments
To minimize heat generation
Q.29
Negative rakes are used for
Carbide tools
Heavy loads
Harder materials
All of these
Q.30
Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same?
Turning
Grinding
Boring
Milling
0 h : 0 m : 1 s
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