The purpose of a riser is to
Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate
Correct Answer :
C. Feed the molten metal to the casting in order to compensate for the shrinkage
Related Questions
In TIG arc welding, the welding zone is shielded by an atmosphere of
Helium gas
Argon gas
Either (A) or (B)
None of these
Which of the following welding process uses non-consumable electrodes?
TIG welding
MIG welding
Manual arc welding
Submerged arc 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
A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as
Shift
Sand wash
Swell
Scab
In order to ram the sand harder at the back of the mould and softer on the pattern face, a ________ is used.
Sand slinger
Squeezing machine
Jolt machine
Stripper plate machine
In order to cut mild steel, the cutting angle of chisel should be
30°
45°
50°
60°
A file with 20 teeth in 25 mm is called
Rough file
Bastard file
Second cut file
Smooth file
For welding plates of thickness less than 5 mm, its edges
Do not require bevelling
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on one side
Should have a double-V or U-groove on both sides
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
Thermit welding is often used in
Replacing broken gear teeth
Repairing broken shears
Joining rails, truck frames and locomotive frames etc.
All of the above
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 width of slot cut by a hacksaw blade is _______ the width of the blade.
Equal to
Less than
Greater than
None of these
When the dimension is expressed as, then the tolerance is
0.035 mm
0.025 mm
0.01 mm
0.06 mm
The chisel used for cutting key ways is
Flat chisel
Cape chisel
Round nose chisel
Diamond pointed chisel
For gas welding, the pressure desired at the welding torch for oxygen is
7 to 103 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
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
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
For cutting brass, the hacksaw blade should have __________ teeth per 25 mm.
14
24
32
40
A basic shaft is one whose
Lower deviation is zero
Upper deviation is zero
Lower and upper deviations are zero
None of these
In die casting, machining allowance is
Small
Large
Very large
Not provided
The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called
Shearing
Piercing
Punching
Blanking
A hacksaw blade cuts on the
Forward stroke
Return stroke
Both forward and return strokes
Cutting depends upon the direction of force
The recrystallisation temperature of steel is
400°C
600°C
800°C
None of these
In spot welding, the spacing between two spot weld should not be less than
d
1.5 d
3 d
6 d
Neutral flame is used to weld
Steel
Cast iron
Copper
All of these
The minimum size of a bloom is
5 cm × 5 cm
10 cm × 10 cm
15 cm × 15 cm
20 cm × 20 cm
In a ________, two or more operations are performed simultaneously at the single stroke of the ram.
Simple die
Progressive die
Combination die
Compound die
For gas welding, the pressure desired at the welding torch for acetylene is
7 to 103 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
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
The cross-section of a chisel is usually
Rectangular
Square
Hexagonal
Octagonal