I have 2 questions please help if you can

1) Shielding gasses are used with a pressure regulator. The regulator screw should be before the cylinders valve(s) are opened

2) Do not not touch any electrode holder or GTAW torch with bare skin or wet gloves. A fatal shock may result

A. new

B. large diameter

C. uninsulated

D. insulated

E. old-fashioned

On a average work day more than work place firs are reorted

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.