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**23) **Estimate the time to drill a hole of 20 mm dia, 80 cm depth in mild steel. Take cutting speed of 15 meter /minute and feed of 0.25 mm/revolution.

**Answer is:**

## 71.28 seconds

### KPSC ITI JTO Workshop Calculation and Science Question Papers - 2018 with Answer Key

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**Answer is:**

### 27

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### 80 calories

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### wire wound resistor

**Answer is:**