Answer the following multiplechoice problem Please answer th

Answer the following multiple-choice problem. Please answer the following questions as (T) for True or (F) for False. In general, a turbulent flow will incur a lower frictional loss as compared to a laminar flow. The drag is solely due to the friction between the flow stream and the surface of a body immersed in the fluid. If the friction factor is smaller, the pressure drop in a pipe is always smaller. The mechanism of the lift generation may be explained using the Bernoulli equation. Flow through a large body may be studied using a scaled down model provided that a similarity analysis is followed. The roughness of a surface may affect the stability of a boundary layer. The boundary layer separation is independent of the shape of the body. Cavitation may reduce the performance of a pump or turbine rapidly and must be avoided to maintain stable and efficient operation. The trailing vortex system of a finite wing may cause induced drag, and subsequently increase the total drag significantly. As angle of attack increases, the lift coefficient increase smoothly until a maximum is reached. Further increases in angle of attack may produce a sudden decrease in lift and the airfoil is said to have stalled.

Solution

1. true

2. true

3. false

as the pressure drop is directly proportional to velocity, length etc, these factors will also have an effect on the pressure drop.

4. true