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ESE Mechanical 2014 Official Paper - 2

Option 4 : 593.75 N m

CT 3: Building Materials

3235

10 Questions
20 Marks
12 Mins

**Concept:**

For uniform wean Theory

Torque \(= \mu W\frac{{\left( {{r_0} + {r_i}} \right)}}{2} \times n\)

Where n → no. of plates surfaces

**Calculation:**

Given: steel plates = 3, Bronze plates = 2

Here we have to subtract 1 because we need the number of contacting surfaces

**∴ n = 3 + 2 – 1 = 4**

**Now,**

Torque \(= \mu W\frac{{\left( {{r_0} + {r_i}} \right)}}{2} \times n\)

\(T = 4 \times 0.25 \times 5000 \times \left( {\frac{{150\; + \;87.5}}{{2000}}} \right)\)

**∴ T = 593.75 N-m**