What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

A. Ultrasonic welding

B. Forge welding

C. Electron beam welding

D. Friction welding

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  19. The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting…
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  21. The abrasive recommended for grinding materials of low tensile strength is
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  25. When the shear angle is large
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