The outlet works for a large detention pond is to be a concrete box with 45 degree wingwalls. The box is to be cast in place. The barrel is to have a square cross-section. It should carry a flow of no more than 20 m3/s. with a headwater of 7 m. The available slope for the barrel is 1%. Determine the size of the culvert.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.