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
Correct Answer :
D. Producing a hole by removing metal along the circumference of a hollow cutting tool
Related Questions
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
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?
Thermit welding
Electroslag welding
Resistance welding
Submerged arc welding
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
In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principle cutting edge angle is 90⁰, the shear angle in degree is
20.56
26.56
30.56
36.56
A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
120
170
180
240
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
As the cutting speed increases, the tool cutting forces
Remain constant
Increases
Decreases
First increases and then decreases
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
The object of caulking in a riveted joint is to make the joint
Free from corrosion
Stronger in tension
Free from stresses
Leak-proof
The grinding operation is a
Shaping operation
Forming operation
Surface finishing operation
Dressing operation
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
In order to prevent tool from rubbing the work _________ on tools are provided.
Rake angles
Relief angles
Face angles
None of these
In order to grind soft material
Coarse grained grinding wheel is used
Fine grained grinding wheel is used
Medium grained grinding wheel is used
Any one of these
Quality screw threads are produced by
Thread milling
Thread chasing
Thread cutting with single point tool
Thread casting
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
A single point thread cutting tool should ideally hav
Zero rake angle
Positive rake angle
Negative rake angle
Point angle
An open structure of a grinding wheel is used for
Soft materials
Tough materials
Ductile materials
All of these
Hardness of steel greatly improves with
Annealing
Cyaniding
Normalizing
Tempering
The guideways are of
Flat type
V-type
Dovetail type
Any one of these
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
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
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
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
Which of the following parameters govern the value of shear angle in continuous chip formation?
True feed
Chip thickness
Rake angle of the cutting tool
All of these
In which of the following machine, the work is usually rotated while the drill is fed into work?
Sensitive drilling machine
Radial drilling machine
Gang drilling machine
Deep hole drilling machine
Which of the following statement is wrong as regard to down milling?
It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.
In up-cut milling the work piece is fed
Against the rotating cutter
At angle of 60° to the cutter
In the direction of the cutter
At the right angle to the cutter
Cutting fluids are used to
Cool the tool
Improve surface finish
Cool the workpiece
All of these
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
In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called
Face
Fillet
Land
Lead