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Workshop Technology

Workshop Technology
The sand used for making cores is

Dry sand
Oil sand
Loam sand
Green sand

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Workshop Technology
When the dimension is expressed as 20­ -0.025 ⁺⁰∙⁰³⁵, then the basic size is

19.975 mm
20.025 mm
20 mm
20.035 mm

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Workshop Technology
The parts of circular cross-section which are symmetrical about the axis of rotation are made by

Hot forging
Hot spinning
Hot extrusion
Hot drawing

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

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

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Workshop Technology
A ring gauge is used to

Test the accuracy of holes
Check the diameter of shafts or studs
All of these
Check the clearance between two mating surfaces

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Workshop Technology
Loam sand is a mixture of

70% sand and 30% clay
50% sand and 50% clay
30% sand and 70% clay
90% sand and 10% clay

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