1. make desired recess in castings
2. strengthen moulding sand
3. support loose pieces
4. remove pattern easily
make desired recess in castings
1. round sieve
2. a long, flat metal plate fitted with an offset handle
3. used to make or repair corners in the mould
4. used to scoop sand deep in the mould
a long, flat metal plate fitted with an offset handle
1. adding to external and internal dimensions
2. subtracting from external and internal dimensions
3. subtracting from external dimensions and adding to internal dimensions
4. adding to external dimen-sions and subtracting from internal dimensions
adding to external dimen-sions and subtracting from internal dimensions
1. zero
2. 5%
3. Less than 15%
4. Less than25%
Less than 15\%
1. feed the casting at a rate constant with the rate of solidification
2. act as reservoir for molten metal
3. help feed the casting until all solidification takes place
4. feed molten metal from pouring basin to gate
feed the casting at a rate constant with the rate of solidification
1. silica and clay
2. clay and alumina
3. silica and alumina
4. clay and silica
silica and clay
1. 50% sand and 10% moisture
2. 40% sand and 10% moisture
3. 50% sand and 18% moisture
4. 80% sand and 29% moisture
50\% sand and 18\% moisture
1. feed the casting at a rate consistent with the rate of solidification
2. act as a reservoir for molten metal
3. help feed the casting until the solidification takes place
4. feed molten from pouring basin to gate
feed molten from pouring basin to gate
1. 0.001 m/m
2. 0.003 to 0.005 m/m
3. 0.01 m/m
4. 0.1 m/m
0.003 to 0.005 m/m
1. binder
2. releasing agent
3. dispersant
4. catalyst
catalyst