A water main is to be designed to serve a proposed Hundred home residential subdivision on 50 acres which of the following a. the required fire flow is nearly same as the average day demand
b. the required fire flow is between 2 times and 5 times the average day demand
c. the required fire flow is between 5times and 100 times the average day demand
d. the required fire flow is more than 100 times average day demand

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.