30°-40°
40°-50°
50°-60°
60°-70°
A. 30°-40°
5 litres
10 litres
15 litres
20 litres
Aluminium
Wax
Lead
All of these
Same
Less
More
None of these
Is extensively used for making bolts and nuts
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Horizontal core
Vertical core
Drop core
Balanced core
+0.05 mm
±0.2 mm
+0.5 mm
±1 mm
Straight polarity
Reversed polarity
Both (A) and (B)
None of these
Form internal cavities in the casting
Improve mould surface
Form a part of a green sand mould
All of these
Riser
Sprue
Core
None of these
Small
Large
Very large
Not provided
At the recrystallisation temperature
Below the recrystallisation temperature
Above the recrystallisation temperature
At any temperature
Feeler gauge
Slip gauge
Ring gauge
Plug gauge
Equal to
Smaller than
Larger than
None of these
1 to 2 mm/m
2 to 5 mm/m
5 to 10 mm/m
10 to 15 mm/m
Flat surfaces
Grooves
Keyways
V-shaped grooves
Single cut file
Double cut file
Rasp cut file
Any one of these
20 mm
20.035 mm
20.025 mm
19.975 mm
Slush casting
Investment casting
True centrifugal casting
Die casting
30% sand and 70% clay
50% sand and 50% clay
70% sand and 30% clay
90% sand and 10% clay
3000°C to 4000°C
4000°C to 5000°C
5000°C to 6000°C
6000°C to 7000°C
±0.05 mm
+0.2 mm
+05 mm
+1 mm
Cast iron
Mild steel
High speed steel
Cast tool steel
Varying the input supply
Changing the primary turns of the transformer
Changing the secondary turns of the transformer
Any one of the above
Plunging
Notching
Slitting
Forming
Carbon electrode and the work
Metal electrode and the work
Bare metal electrode and the work
Two tungsten electrodes and the work
Symmetrical shape about vertical axis
Symmetrical shape about horizontal axis
Irregular shape
Nonferrous metal only
t
1.5 t
3 t
6 t
400°C
600°C
800°C
None of these
5 cm × 5 cm
10 cm × 10 cm
15 cm × 15 cm
20 cm × 20 cm
1800°C
2100°C
2400°C
3200°C