| Drag force is a function of i. projected area of the body ii. mass density of the fluid iii. velocity of the body The correct answer is |
A) (i) and (ii)
B) (i) and (iii)
C) (ii) and (iii)
D) (i), (ii) and (iii)
| The friction drag is primarily due to |
A) Pressure distribution over the body surface
B) Separation of boundary layer
C) Shear stresses generated due to viscous action
D) Weight component in the direction of the flow
| The drag and lift forces experienced by an object placed in a fluid stream are due to |
A) Pressure and turbulence
B) Viscosity and turbulence
C) Pressure and viscosity
D) Pressure and gravity
| The vertical component of the hydrostatic force on a submerged curved surface is |
A) The mass of the liquid vertically above it
B) The weight of the liquid vertically above it
C) The force on a vertical projection of the surface
D) The product of the pressure at centroid and the surface area
| A streamline body is defined as a body about which |
A) the flow separation is suppressed
B) the flow is laminar
C) the flow is along streamlines
D) the drag is zero
| Wake |
A) is a region of high pressure
B) always occurs after a separation point
C) is the principal cause of skin friction
D) always occurs when deformation drag predominates
| A stagnation point is a point |
A) Where the pressure is zero
B) Where the total energy is zero
C) Where the velocity of flow reduces to zero
D) Where the total energy is maximum
| When compared to a streamlined body, a bluff body will have |
A) More pressure drag and more friction drag
B) More pressure drag and less friction drag
C) Less pressure drag and more friction drag
D) Less pressure drag and less friction drag
| Pressure drag results to |
A) formation of wake
B) turbulence of the wake
C) existence of stagnation point in front of a body
D) high Reynolds number
