In a cold chamber die casting machine, only nonferrous alloys with _________ are casted.
Low melting temperature
High melting temperature
Both (A) and (B)
None of these
Correct Answer :
B. High melting temperature
Related Questions
The surface to be left unmachined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
The difference between the upper limit and lower limit of a dimension is called
Nominal size
Basic size
Actual size
Tolerance
When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as
Die casting method
Slush casting method
Permanent mould casting method
Centrifugal casting method
In a four high rolling mill, the diameter of backing up rolls is ________ the diameter of working rolls.
Equal to
Smaller than
Larger than
None of these
The property of sand due to which the sand grains stick together is called
Collapsibility
Permeability
Cohesiveness
Adhesiveness
The electrodes used in spot welding have a tip of
Stainless steel
Aluminium
Copper
Brass
In shielded arc welding
Large electrode is used
Welding rod coated with slag is used
Welding rod coated with fluxing material is used
None of the above
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as
Drawing
Squeezing
Coining
Planishing
The consumable electrode is used in
Carbon arc welding
Submerged arc welding
TIG arc welding
MIG arc welding
The minimum size of a bloom is
5 cm × 5 cm
10 cm × 10 cm
15 cm × 15 cm
20 cm × 20 cm
In order to produce uniform packing of sand in the moulds, a __________ is used.
Sand slinger
Squeezing machine
Jolt machine
Stripper plate machine
The welding set up is said to have straight polarity, when
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed
The welding process used in joining mild steel shanks to high speed drills, is
Spot welding
Seam welding
Flash butt welding
Upset butt welding
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
An oxidising process used for aluminium and magnesium articles is called
Galvanising
Anodising
Parkerising
Sherardizing
Which of the following statement is wrong?
The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.
The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.
The castings produced by centrifugal casting method have open and coarse grained structure.
All of the above
The property of sand due to which it evolves a great amount of steam and other gases is called
Collapsibility
Permeability
Cohesiveness
Adhesiveness
The directional solidification in casting can be improved by using
Chills and chaplets
Chills and padding
Chaplets and padding
Chills, chaplets and padding
The acetylene cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
For smoothing and cleaning out depressions in the mould, a __________ is used.
Slick
Lifter
Swab
Gagger
In arc welding, the electric arc is produced between the work and the electrode by
Voltage
Flow of current
Contact resistance
All of these
When the dimension is expressed as, then the tolerance is
0.035 mm
0.025 mm
0.01 mm
0.06 mm
In a cold chamber die casting machine, only nonferrous alloys with _________ are casted.
Low melting temperature
High melting temperature
Both (A) and (B)
None of these
Blanking and piercing operations can be performed simultaneously in a
Simple die
Progressive die
Compound die
Combination die
A diamond pointed chisel is used for cutting
Flat surfaces
Grooves
Keyways
V-shaped grooves
During hot working of metals
Poor surface finish is produced
Scale is formed on the metal surface
Close tolerances cannot be maintained
All of these
In a gas welding of mild steel using an oxyacetylene flame, the total amount of acetylene consumed is 10 litres. The oxygen consumption from the cylinder is
5 litres
10 litres
15 litres
20 litres
The welding process used to join the ends of two pipes of uniform cross-section, is
Spot welding
Seam welding
Projection welding
Upset butt welding
A progressive limit gauge has
'Go' and 'Not go' member on the same side of the gauge
Separate 'Go' and 'Not go' members
'Go' member at one end and 'Not go' member at the other end
None of the above
The process extensively used for making bolts and nuts is
Hot piercing
Extrusion
Cold peening
Cold heading