The roof of the building is flat. It is composedof 2 in. of reinforced concrete on 18-gauge metal deck-ing that weighs 3 psf. A single-ply waterproof sheet 0.7psf, will be used. The ceiling beneath the roof is un-finished, but allowance for mechanical ducts should beprovided. Determine the roof dead load.

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.

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero