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
Correct Answer :
D. 26 mm/m
Related Questions
The temperature of the inner luminous cone of neutral flame is about
1000°C
1250°C
2100°C
3200°C
When the dimension is expressed as 20 -0.025 ⁺⁰⁰³⁵, then the basic size is
20 mm
20.035 mm
20.025 mm
19.975 mm
In order to cut mild steel, the cutting angle of chisel should be
30°
45°
50°
60°
In arc welding, the electric arc is produced between the work and the electrode by
Voltage
Flow of current
Contact resistance
All of these
Structural sections such as rails, angles, I-beams are made by
Hot rolling
Hot drawing
Hot piercing
Hot extrusion
For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately
42 mm
44 mm
46 mm
48 mm
Cast iron and steel pipes are produced by
Slush casting
Investment casting
True centrifugal casting
Die casting
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
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
When more volume of acetylene and less volume of oxygen is supplied, then a ________ flame is obtained.
Neutral
Oxidising
Carburising
None of these
A gimlet is a ________ tool.
Boring
Marking
Cutting
None of these
Most of the oxyacetylene welding is done with
Neutral flame
Oxidising flame
Carburising flame
All of these
The acetylene cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
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
A casting defect which results in general enlargement of a casting is known as
Shift
Sand wash
Swell
Scab
The process of increasing the cross-section of a bar at the expense of its length, is called
Drawing down
Upsetting
Spinning
Peening
Cores are used to
Form internal cavities in the casting
Improve mould surface
Form a part of a green sand mould
All of these
In blanking operation, the clearance is provided on
Punch
Die
Half on the punch and half on the die
Either on punch or die depending upon designer's choice
A hacksaw blade cuts on the
Forward stroke
Return stroke
Both forward and return strokes
Cutting depends upon the direction of force
Which of the following material can be used for making patterns?
Aluminium
Wax
Lead
All of these
The recrystallisation temperature of steel is
400°C
600°C
800°C
None of these
Thread rolling is restricted to
Ferrous materials
Ductile materials
Hard materials
None of these
The tolerance produced by shell moulding process of casting is
+0.05 mm
±0.2 mm
+0.5 mm
±1 mm
The type of file used for a wood work is
Single cut file
Double cut file
Rasp cut file
Any one of these
In backhand welding, the angle between the welding torch and the work is kept as
30°-40°
40°-50°
50°-60°
60°-70°
The cross-section of a chisel is usually
Rectangular
Square
Hexagonal
Octagonal
The welding process used in joining mild steel shanks to high speed drills, is
Spot welding
Seam welding
Flash butt welding
Upset butt welding
A pattern maker's shrinkage rule considers
All pattern allowances
Only shrinkage allowance
All materials to be cast
All materials of the pattern
Swab is used for
Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand
Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of the moulding box
In order to get uniform thickness of the plate by rolling process, one provides
Camber on the rolls
Offset on the rolls
Hardening of the rolls
Antifriction bearings