1000+ Fluid Mechanics Question Bank with Answers Pdf - 2

Question: 6

The best hydraulic channel cross section is the one which has a

(A) maximum area for a given flow

(B) minimum wetted perimeter

(C) minimum roughness coefficient

(D) least cost

Question: 7

Streamlines and equipotential lines

(A) can be determined mathematically for all boundary conditions

(B) are orthogonal wherever they meet

(C) form meshes of perfect squares

(D) can be drawn graphically for viscous flow around any boundary

Question: 8

Separation of flow occurs when

(A) the boundary layer comes to rest

(B) the cross section of a channel is reduced

(C) the pressure intensity reaches a minimum

(D) all of the above

Question: 9

The viscosity of a fluid varies with

(A) temperature and pressure

(B) temperature

(C) density

(D) pressure

Question: 10

The conditions favourable for laminar flow are

(A) low mean velocity

(B) low mass density

(C) high viscosity

(D) all the above