Sand wash is a casting defect which
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the 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
Correct Answer :
C. Occurs near the ingates as rough lumps on the surface of a casting
Related Questions
The blank diameter used in thread rolling will be
Equal to minor diameter of the thread
Equal to pitch diameter of the thread
A little larger than the minor diameter of the thread
A little larger than the pitch diameter of the thread
In order to cut mild steel, the cutting angle of chisel should be
30°
45°
50°
60°
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?
The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction
The upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction
The bottom and middle roll rotate in the same direction
Any one of the above
In electric resistance welding, voltage required for heating is
1 to 5 volts
6 to 10 volts
11 to 20 volts
50 to 100 volts
Tandem drawing of wires and tubes is necessary because
It is not possible to reduce at one stage
Annealing is needed between stages
Accuracy in dimensions is not possible otherwise
Surface finish improves after every drawing stage
The maximum flame temperature occurs
At the outer cone
At the inner cone
Between the outer and inner cone
At the torch tip
Green 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
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be
10 mm/m
16 mm/m
20 mm/m
26 mm/m
The difference between the upper limit and lower limit of a dimension is called
Nominal size
Basic size
Actual size
Tolerance
The type of file used for a wood work is
Single cut file
Double cut file
Rasp cut file
Any one of these
The surface to be machined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
The temperature of the inner luminous cone of neutral flame is about
1000°C
1250°C
2100°C
3200°C
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is
Less than 0.1 percent
Less than 0.3 percent
More than 0.3 percent
Anywhere between 0.1 to 1 percent
The operation of cutting of a flat sheet to the desired shape is called
Shearing
Piercing
Punching
Blanking
Sand wash is a casting defect which
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the 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
Aluminium is the best material for making patterns because it is
Light in weight
Easy to work
Corrosion resistant
All of these
To prevent the body of the blade from jamming in the saw cut, the teeth of blade are
Strengthened
Sharpened
Set
All of these
Piercing is an operation of cutting
A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal
In order to check the clearance between two mating surfaces, a ________ gauge should be used.
Ring
Plug
Feeler
None of these
Structural sections such as rails, angles, I-beams are made by
Hot rolling
Hot drawing
Hot piercing
Hot extrusion
When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.
Horizontal core
Vertical core
Drop core
Balanced core
When the file is moved to and fro over the work, it is known as
Cross filing
Draw filing
Pull and push filing
None of these
The consumable electrode is used in
Carbon arc welding
Submerged arc welding
TIG arc welding
MIG arc welding
A pattern maker's shrinkage rule considers
All pattern allowances
Only shrinkage allowance
All materials to be cast
All materials of the pattern
In permanent mould casting method
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure
None of the above
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
Most of the oxyacetylene welding is done with
Neutral flame
Oxidising flame
Carburising flame
All of these
The surface to be left unmachined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
In a cold 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
Low temperature and pressure is used
A hacksaw blade is specified by its
Length
Material
Width
Number of teeth