The neutral flame is created by supplying the flame with the amount of oxygen which is

precisely enough for reduction but no oxidation occurs

precisely enough for equal amounts of oxidation and reduction occurs

precisely enough for oxidation but no reduction occurs

precisely enough for burning, and neither oxidation nor reduction occurs

Lancing

Machining

Notching

None of these

Notching

Planishing

Straightening

Deforming

Tape

Ring Gauge

Screw Gauge

Scale

7200 N

1900 N

1368 N

None of these