Question

A cylindrical job with diameter of 200 mm and height of 100 mm is to be cast using modulus method of riser design. Assume that the bottom surface of cylindrical riser does not contribute as cooling surface. If the diameter of the riser is equal to its height, then the height

Answer 1

Thank you for asking this question. Here is your answer:

MR = VR/AR  

MR = π4D²H / π4D²+ πDH

Given, D = H,

MR=D/H…..(i)

MC= VC/AC  

MC = π4D²H / 2×π/4D²+ πDH

MC = D/4 H/ D/2 + DH

MC = 200 x 100 / 4 x 100 / 200/2 + 100

MC = 25 ... (ii)

MR =  1.2Mc

D/5 = 1.2 times 25

D = H = 150 mm is the final answer for this question

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