The operation of making a cone-shaped enlargement of the end of a hole is known as
Counter-sinking
Counter-boring
Trepanning
Spot facing
Correct Answer :
A. Counter-sinking
Related Questions
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 velocity of tool along the tool face is known as
Shear velocity
Chip velocity
Cutting velocity
Mean velocity
Carbide tipped tools usually have
Negative rake angle
Positive rake angle
Any rake angle
No rake angle
Which of the following operations can be performed with milling cutters?
Cutting key ways on shafts
Cutting external screw threads
Cutting teeth of spur gears
All of these
A tool used to withdraw a drill from the sleeve is called
Drill remover
Drill puller
Drift
Drill drawer
A right hand tool on a lathe cuts most efficiently when it travels
From left to right end of the lathe bed
From right to left end of the lathe bed
With the help of a compound slide
Across the bed
The carbide tools operating at very low cutting speeds (below 30 m/min)
Reduces tool life
Increases tool life
Have no effect on tool life
Spoils the work piece
In drilling softer materials, the cutting speed is _________ as compared to harder materials.
Same
Low
High
None of these
The grinding operation is a
Shaping operation
Forming operation
Surface finishing operation
Dressing operation
In oblique cutting system, the maximum chip thickness
Occurs at the middle
May not occur at the middle
Depends upon the material of the tool
Depends upon the geometry of the tool
The cutting speed is maximum while machining __________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
Chemical milling operation is performed
On universal milling machine
On plain milling machine
In a tank containing an etching solution
Any one of these
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
As the cutting speed increases, the tool cutting forces
Remain constant
Increases
Decreases
First increases and then decreases
What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?
Torch brazing
Dip brazing
Resistance brazing
Furnace brazing
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
The grinding wheel speed (surface speed in m/min) usually varies from
500 to 1000
1000 to 1500
1500 to 2000
2000 to 2500
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
In transverse grinding
The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?
Reactor
Kerf
Inductor
Cone
A 15 mm drilling machine means that it can drill a hole
Of maximum diameter 15 mm
In 15 mm thick plates
Having cross-sectional area of 15 mm²
None of these
Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 μm and current flow time of 0.2 second, heat generated during the process will be
0.2 Joule
1 Joule
5 Joule
1000 Joule
Which of the following statement is correct about hot machining?
It requires less power than machining metals at room temperature.
The rate of tool wear is lower.
It is used for machining high strength and high temperature resistant materials.
All of the above
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
The operation of making a cone-shaped enlargement of the end of a hole is known as
Counter-sinking
Counter-boring
Trepanning
Spot facing
The depth of cut in drilling is __________ the drill diameter.
Equal to
One-fourth
One-half
Double
Which of the following statement is correct regarding grinding of high carbon steel?
Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
Aluminium oxide wheels are employed.
The grinding wheel has to be of open structure.
All of the above
In electro-discharge machining, dielectric is used to
Help in the movement of the sparks
Control the spark discharges
Act as coolant
All of these
In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
Cylindrical grinder
Internal grinder
Surface grinder
Tool and cutter grinder
A __________ grinding wheel is used to grind soft materials.
Course grained
Medium grained
Fine grained
None of these