For a laminar boundary layer fluid moves in a very smooth flow. The laminar flow creates less skin friction drag. It is a less stable flow. The laminar boundary layer has got an increase in its thickness.

Bodies with a larger cross section will have higher drag. Pressure drag is also called as form drag. It mainly arises because of shape of object. Thus, correct option ?b?.

For a streamlined body to achieve low drag coefficient, boundary layer must be attached to surface of body for a long time as possible. This causes wake to be narrow.

Reynold?s number is used to determine wher flow is laminar or turbulent. If Reynold?s number is less than 2000, it is a laminar flow. If Reynold?s number is greater than 2000, n it is a turbulent flow.

The drag coefficient is directly proportional to drag force. In fluid dynamics, drag coefficient has no dimensions. It is a dimensionless quantity. Drag coefficient is used to quantify resistance of an object in a fluid environment.

In a velocity triangle at inlet and outlet, control volume is moving with a uniform velocity. Therefore, momentum orem of control volume is at a steady flow. Thus, efficiency of vane is given by 1-(V₂² / V₁²).

In fluid dynamics, drag coefficient has no dimensions. It is a dimensionless quantity. Drag coefficient is used to quantify resistance of an object in a fluid environment. It is mainly used in air and water.

With increase in flow velocity, Reynolds number increases. Reynolds number below 2000 is laminar flow and Reynolds number above 2000 is for turbulent flow. Thus, correct option is Increases.

Boundary layer separation undergoes detachment from surface into a broader wake. It occurs mainly when portion of boundary layer is closest to wall. It leads to reverse in flow direction.

Drag force is directly proportional to density of fluid. It is force that acts opposite to relative motion of any object moving with respect to its surroundings. Thus, correct option is ?a?.