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Question

# Linked Date Question (Q.9.62 - Q.9.63): In an EDM process using an RC relaxation circuit, a 12 mm diameter through hole is made in a steel plate of 50 mm thickness using a graphite tool and kerosene as dielectric. Assume discharge time to be negligible. Machining is carried out under the following conditions. Resistance = 40 Ω Capacitance = 20 μF Supply voltage = 220 V Discharge voltage = 110 V The time for one cycle, in milliseconds, is

A
0.55
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B
0.32
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C
0.89
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D
0.24
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Solution

## The correct option is A 0.55Cycle time: Tc=R.C.ln(VsVs−Vd) =40×20×10−6×ln(220220−110) =0.55 milli seconds.

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