EDM machining is applied for
Shaping carbide dies and punches having complicated profiles
Making large number of small holes in sieves and fuel nozzles
Embossing and engraving on harder materials
All of these
Correct Answer :
D. All of these
Related Questions
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.
Fixtures are used
For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
To check the accuracy of workpiece
None of the above
The type of tool used on lathe, shaper and planer is
Single point cutting tool
Two point cutting tool
Three point cutting tool
Multipoint cutting tool
The snag grinding is done
To produce good surface finish and high degree of accuracy
To remove considerable amount of metal without regard to accuracy of the finished surface
To grind exterior cylindrical surfaces
Any one of the above
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
Internal or external threads of different pitches can be produced by
Pantograph milling machine
Profiling machine
Planetary milling machine
Piano miller
The operation in which oil is permeated into the pores of a powder metallurgy product is known as
Mixing
Sintering
Impregnation
Infiltration
A mandrel is used to hold
An eccentric work
A heavy work
A thin work
None of these
An expendable pattern is used in
Slush casting
Squeeze casting
Centrifugal casting
Investment casting
Quality screw threads are produced by
Thread milling
Thread chasing
Thread cutting with single point tool
Thread casting
Low helix angle drills are preferred for drilling holes in
Plastics
Copper
Cast steel
Carbon steel
The silicon carbide abrasive is chiefly used for grinding
Cemented carbide
Ceramic
Cast iron
All of these
A taper 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
Glazing in grinding wheels __________ cutting capacity.
Has no effect on
Increase
Decrease
None of these
Which among the NC operations given below are continuous path operations? Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
AW, LC and M
AW, D, LC and M
D, LC, P and SW
D, LC, and SW
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
High metal removal rate
Dry machining
Use of soft cutting tool
Surface finish
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
A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
0.2 mm
10 mm
20 mm
100 mm
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
The point angle of a drill, for drilling stainless steel, is
90°
118°
135°
150°
The main purpose of spheroidising treatment is to improve
Hardenability of low carbon steels
Machinability of low carbon steels
Hardenability of high carbon steels
Machinability of high carbon steels
A fine grained grinding wheel is used to grind
Hard and brittle materials
Soft and ductile materials
Hard and ductile materials
Soft and brittle materials
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 may fail due to
Cracking at the cutting edge due to thermal stresses
Chipping of the cutting edge
Plastic deformation of the cutting edge
All of these
The primary purpose of a sprue in a casting mould is to
Feed the casting at a rate consistent with the rate of solidification.
Act as a reservoir for molten metal
Feed molten metal from the pouring basin to the gate
Help feed the casting until all solidification takes place
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
The grinding of long, slender shafts or bars is usually done by
In-feed grinding
Through feed grinding
End-feed grinding
Any one of these
The crystal structure of austenite is
Body centred cubic
Base centred cubic
Hexagonal closed packed
Body centred tetragonal
In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called
Friction zone
Work-tool contact zone
Shear zone
None of these
If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
Forehand welding
Flux cored ARC welding
Electro slag welding
Pulsed spray welding