Scab is a casting defect which occurs as sand patches on the upper surface of a casting.

More Questions from Workshop Technology

• In bending operation, the metal takes the shape of a punch.
• Carburising flame is used to weld
• Lancing is the operation of
• For welding plates of thickness more than 12.5 mm, its edges
• A pouring basin acts as a reservoir for the molten metal.
• In a cold chamber die casting machine, only non-ferrous alloys with __________ are casted.
• In electric resistance welding, voltage required for heating is
• Cores are used to
• For welding plates of thickness less than 5 mm, its edges
• Shrinkage allowance is made by adding to external dimensions and subtracting from internal dimensions.

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