In average work, the tolerance produced by investment casting method is
±0.05 mm
+0.2 mm
+05 mm
+1 mm
Correct Answer :
A. ±0.05 mm
Related Questions
The directional solidification in casting can be improved by using
Chills and chaplets
Chills and padding
Chaplets and padding
Chills, chaplets and padding
A file removes the metal during
Forward stroke
Return stroke
Both forward and return strokes
None of these
The sand used for making cores is
Green sand
Dry sand
Loam sand
Oil sand
In a compound die
Only one operation is performed at each stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
Two or more cutting operations are performed at one station of the press in every stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by
Washing it with water
Rubbing on wood
Washing it with dilute acid
Using file card
The surface to be left unmachined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called
Shearing
Piercing
Punching
Blanking
The temperature at which the new grains are formed in the metal is called
Lower critical temperature
Upper critical temperature
Eutectic temperature
Recrystallisation temperature
Loam sand is a mixture of
30% sand and 70% clay
50% sand and 50% clay
70% sand and 30% clay
90% sand and 10% clay
A sand employed on the faces of the pattern before moulding, is called
Green sand
Dry sand
Loam sand
Parting sand
The metal extrusion process is generally used for producing
Uniform solid sections
Uniform hollow sections
Uniform solid and hollow sections
Varying solid and hollow sections
Shift is a casting defect which
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Occurs as sand patches on the upper surface of a casting
The casting method adopted for ornaments and toys of nonferrous alloys, is
Permanent mould casting
Slush casting
Die casting
Centrifugal casting
Galvanising is a
Zinc diffusion process
Process of coating zinc by hot dipping
Process used for making thin phosphate coating on steel
None of the above
The metal patterns as compared to wooden patterns require less
Shrinkage allowance
Machining allowance
Draft allowance
Distortion allowance
In arc welding, the electric arc is produced between the work and the electrode by
Voltage
Flow of current
Contact resistance
All of these
In a hot chamber die casting machine
Melting pot is separate from the machine
Melting pot is an integral part of the machine
Melting pot may have any location
High temperature and pressure is used
The draft or taper allowance on casting is generally
1 to 2 mm/m
2 to 5 mm/m
5 to 10 mm/m
10 to 15 mm/m
The process extensively used for making bolts and nuts is
Hot piercing
Extrusion
Cold peening
Cold heading
The increase in hardness due to cold working, is called
Age hardening
Work hardening
Induction hardening
Flame hardening
Aluminium is the best material for making patterns because it is
Light in weight
Easy to work
Corrosion resistant
All of these
In a centrifugal casting method
Core is made of sand
Core is made of ferrous metal
Core is made of nonferrous metal
No core is used
The centrifugal casting method, is used for casting articles of
Symmetrical shape about vertical axis
Symmetrical shape about horizontal axis
Irregular shape
Nonferrous metal only
The mode of deformation of the metal during spinning is
Bending
Stretching
Rolling and stretching
Bending and stretching
Cast iron and steel pipes are produced by
Slush casting
Investment casting
True centrifugal casting
Die casting
The tolerance produced by shell moulding process of casting is
+0.05 mm
±0.2 mm
+0.5 mm
±1 mm
Carburising flame is used to weld
Steel, cast iron, copper, aluminium etc
Brass and bronze
Hard surfacing materials such as stellite
All of these
Seam welding is best adopted for metal thickness ranging from
0.025 to 3 mm
3 to 5 mm
5 to 8 mm
8 to 10 mm
To prevent the body of the blade from jamming in the saw cut, the teeth of blade are
Strengthened
Sharpened
Set
All of these
The flux commonly used in brazing is
Zinc chloride
Ammonium chloride
Rosin plus alcohol
Borax