IN A SAND CASTING OPERATION, THE TOTAL LIQUID HEAD IS MAINTAINED C...

58. In a sand casting operation, the total liquid head is maintained constant such that

it is equal to the mould height. The time taken to fill the mould with a top gate is

.

t If the same mould is filed with a bottom gate, then the time taken is t

.

Ignore the time required to fill the runner and frictional effects. Assume

atmospheric pressure at the top molten metal surfaces. The relation between

and

t t is:

(A) t

= 2 t

(B) t

= 2 t

t = t

(C)

2

(D) t

= 2 2 t