A cylindrical riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm 10 cm 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____.

A cylindrical riser of 6 cm diameter and 6 cm height has to be designe

1.	A cylindrical riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm 10 cm 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____.
A.	4.133 min
B.	7.133 min
C.	3 min
D.	None of these
Answer» C. 3 min

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A cylindrical riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm 10 cm 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____.

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