Manufacturing And Production Technology
Tool life is generally better when

Hard constituents are present in the micro-structure of the tool material
None of the listed here
Grain size of the metal is large
Grain size of the metal is small

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Manufacturing And Production Technology
Shrinkage allowance on pattern is provided to compensate for shrinkage when

The temperature of liquid metal drops from pouring to freezing temperature
The metal changes from liquid to solid state at freezing temperature
The temperature of metal drops from pouring to room temperature
The temperature of solid phase drops from freezing to room temperature

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Manufacturing And Production Technology
Jigs are used

None of these
To check the accuracy of workpiece
For holding the work in milling, grinding, planing or turning operations
For holding and guiding the tool in drilling, reaming or tapping operations

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Manufacturing And Production Technology
A jig is defined as a device which

Is used to check the accuracy of workpiece
All of these
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation

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