For laminar flow in circul lar tube, the friction factor depends upon the tube rou factor (k) a)-true b)- false. give reasons for your choice.

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