Workshop Technology
Shift is a casting defect which

Results in a mismatching of the top and bottom parts of a casting
Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in general enlargement of a casting

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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
Rotary swaging

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is extensively used for making bolts and rivets
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work

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