The 30-min unit hydrograph for an urban catchment is given by Time (min) Runoff (m3 /s) Time (min) Runoff (m3 /s) 0 0.0 210 0.66 30 1.4 240 0.49 60 3.2 270 0.36 90 1.5 300 0.28 120 1.2 330 0.25 150 1.1 360 0.17 180 1.0 390 0.00 The following 120-min storm occurs: Time (min) Rainfall excess (cm) 0-30 2.4 30-60 1.5 60-90 3.1 90-120 2.0 Determine the peak runoff (m3 /s) generated by this 120-min storm..

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

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.

Which one of the following faults cause the coffee in a brewer to keep boiling after the brewing cycle is finished? a. an open circuit in the heating element b. a short circuit at the terminals c. welded contacts on the thermostat d. a leak around the gasket