Workshop Technology
For gas welding, the pressure desired at the welding torch for oxygen is

7 to 103 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
70 to 280 kN/m²

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

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Workshop Technology
A jolt machine is used to

Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould
Produce uniform sand hardness throughout the mould

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