Question: Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?

• 1. Non-viscous
• 2. Viscous
• 3. Turbulent
• 4. Rotational

Question: A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any

• 1. VX = V0 + q (x3/L2D)
• 2. VX = V0 + ⅓q (x3/L2)
• 3. VX = V0 + 2q (x2/LD)
• 4. VX = V0 + (4/3) q (x3/L2D)

Question: The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?

• 1. 4(Ro-Ri)
• 2. √(Ro-Ri)
• 3. 2(Ro-Ri)
• 4. Ro + Ri

Question: Pressure drop for laminar fluid flow through a circular pipe is given by__________________?

• 1. 4f (L/D) (v2/2gc) ρ
• 2. 32 (μLV/gc D2)
• 3. 16/NRe
• 4. (fLρ/D) (v2/2gc)

Question: In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________?

• 1. The velocity of sound
• 2. Dependent on its cross-sectional area
• 3. Dependent on fluid viscosity
• 4. Dependent on fluid density

Question: Minimum fluidisation velocity for a specific system depends upon the___________________?

• 1. Particle size
• 2. Fluid viscosity
• 3. Density of both the particle & the fluid
• 4. All A, B & C

Question: The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by____________________?

• 1. 4x
• 2. 2x
• 3. x
• 4. √x

Question: The most economical flow control valve for use with large diameter pipes is a__________________?

• 1. Butterfly valve
• 2. Globe valve
• 3. Needle valve
• 4. None of these

Question: The lift of a balloon is_________________?

• 1. Increased, as it rises to a higher altitude
• 2. Due to the weight of the atmospheric air, that it displaces
• 3. Not dependent on the temperature of the atmosphere
• 4. None of these

Question: Unit of mass velocity is__________________?

• 1. kg/hr
• 2. kg/m2. hr
• 3. kg/m2
• 4. kg/m3. hr