A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 104 IT 1.23 where I = 300 A and the melting point of the material, T = 1600 C. The time (in minutes) for machining this hole is (correct to two decimal places).

A circular hole of 25 mm diameter and depth of 20 mm is machined by ED

1.	A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 104 IT 1.23 where I = 300 A and the melting point of the material, T = 1600 C. The time (in minutes) for machining this hole is (correct to two decimal places).
A.	2.1431 min
B.	7.1431 min
C.	78.1431 min
D.	9.1431 min
Answer» C. 78.1431 min

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A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 104 IT 1.23 where I = 300 A and the melting point of the material, T = 1600 C. The time (in minutes) for machining this hole is (correct to two decimal places).
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A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 104 IT 1.23 where I = 300 A and the melting point of the material, T = 1600 C. The time (in minutes) for machining this hole is (correct to two decimal places).

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