19) Which type of electrode produces short arc length?

Answer is:

Heavy coated electrodes

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20) Which type of arc length produces deep penetration weld?

Answer is:

Short arc length

21) What is the conversion function of a rectifier?

Answer is:

AC to DC

Explanation:

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation is performed by the inverter. The process is known as rectification, since it "straightens" the direction of current.