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
Correct Answer :
C. Becomes smaller and finally does not form at all
Related Questions
A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.
Soft grade
Medium grade
Hard grade
None 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
In plunge 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
Friction at the tool-chip interface can be reduced by
Decreasing the rake angle
Increasing the depth of cut
Decreasing the cutting speed
Increasing the cutting speed
Misrun is a casting defect which occurs due to
Very high pouring temperature of the metal
Insufficient fluidity of the molten metal
Absorption of gases by the liquid metal
Improper alignment of the mould flasks
Which of the following arc welding processes does not use consumable electrodes?
GMAW
GTAW
Submerged Arc Welding
None of these
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 hardness of a grinding wheel is determined by the
Hardness of abrasive grains
Ability of the bond to retain abrasives
Hardness of the bond
Ability of the grinding wheel to penetrate the work piece
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
Cutting speed
Feed rate
Shear angle
Tool geometry
When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as
Electrochemical machining
Electro-discharge machining
Ultrasonic machining
None of these
A process of removing metal by pushing or pulling a cutting tool is called
Up milling
Down milling
Forming
Broaching
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
The tool life is affected by
Depth of cut
Cutting speed
Feed
All of these
Which of the following is the correct data structure for solid models?
Solid part - faces - edges - vertices
Solid part - edges - faces - vertices
Vertices - edges - faces - solid parts
Vertices - faces- edges - solid parts
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
A lathe with four steps on the cone pulley and with back-gears will have
Four direct speeds
Four indirect speeds
Four direct and four indirect speeds
Eight indirect speeds
Which of the following statement is correct about EDM machining?
It can machine hardest materials.
It produces high degree of surface finish.
The tool and work are never in contact with each other.
All of these
An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as
Counter-boring
Grooving
Knurling
Facing
The example of snag grinding is
Trimming the surface left by sprues and risers on castings
Grinding the parting line left on castings
Removing flash on forgings
All of these
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
Grinding wheels should be tested for balance
Only at the time of manufacture
Before starting the grinding operation
At the end of grinding operation
Occasionally
Which of the following statement is incorrect with reference of lathe cutting tools?
The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges
The heel is that part of the tool which is shaped to produce the cutting edges and face
The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
A better machinable metal is one which gives
Lower chip-tool contact area and larger shear angle
Higher chip-tool contact area and smaller shear angle
Lower chip-tool contact area and smaller shear angle
Higher chip-tool contact area and larger shear angle
Which of the following statement is correct for orthogonal cutting system?
The cutting edge of the tool is perpendicular to the direction of tool travel.
The cutting edge clears the width of the workpiece on either ends.
The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge.
All of the above
In a shaper, the length of stroke is increased by
Increasing the centre distance of bull gear and crank pin
Decreasing the centre distance of bull gear and crank pin
Increasing the length of the arm
Decreasing the length of the slot in the slotted lever
A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.
Soft grade
Medium grade
Hard grade
None of these
Internal gears can be made by
Hobbing
Shaping with pinion cutter
Shaping with rack cutter
Milling
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
A hole is of dimension φ = 9 ₊0⁺⁰⁰¹⁵ mm. The corresponding shaft is of dimension φ = 9 ₊0.001⁺⁰⁰¹⁰ mm. The resulting assembly has
Loose running fit
Close running fit
Transition fit
Interference fit
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