Workshop Technology
For arc welding

Alternating current with high frequency is used
Alternating current with low frequency is used
Any one of these
Direct current is used

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness

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Workshop Technology
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

The bottom and middle roll rotate in the same direction
The upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction
Any one of the above
The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction

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