A safety clutch with shear pins in Figure 1 transmits a torque of T = 500 N-m. The clutch has tve identical pins on the circle of diameter of Dm = 100 mm. Pins are made of medium carbon steel and normalized, with an allowable stress of [7] = 400 MPa. It is required the safety clutch function at 50% of overload. Decide the diameter of the pins. 18 marks] D. Figure 1 Safety Clutch.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]