9. A concrete dam (Fig below) is constructed across a river over a permeable stratum of soil of limited thickness. The water heads are upstream side 16m and 2 m on the downstream side. The flow net constructed under the dam gives is given as below. What is the value of Nf and Nd?
Calculate the seepage loss through the subsoil if the average value of the hydraulic conductivity is 6 x 10-3 cm/sec horizontally and 3 x 10-4 cm/ sec vertically.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.

What are the major differences between injection molding and extrusion?