Consider the system:
G(s) = s +1 - 2i / s^2 + 2s + 5
This system is:
O Controllable, observable
O Not controllable nor observable
O Controllable, not observable
O Not controllable, observable

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false