1. 18000 kJ
2. 9000kJ
3. 6000 kJ
4. None of the above
None of the above
1. 3
2. 4
3. 5
4. 6
4
1. Increases from centre to periphery
2. Decreases from centre to periphery
3. remains constant
4. is irrelevant to the drilling operation
Increases from centre to periphery
1. 2T/g
2. T(1+e4x)
3. 4T/g
4. none of the above
4T/g
1. Strainer
2. Button well
3. Skim bob
4. all of the above
all of the above
1. 0.5
2. 2.0
3. √2
4. 1
2.0
1. 20 mm
2. 10 mm
3. 5 mm
4. 2.5 mm
2.5 mm
1. Copper
2. Steel
3. glass-wool
4. Refractory brick
glass-wool
1. 4 rad/s
2. 8 rad/s
3. 10 rad/s
4. 12 rad/s
8 rad/s
1. Make the steel softer
2. Burn away oil, grease, etc, from the plate surface
3. Prevent cold cracks
4. Prevent plate distortion
Prevent cold cracks