Question: For an ideal fluid flow, Reynolds number is___________________?

• 1. 2100
• 2. 100
• 3. 0
• 4. ∞

Question: Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential?

• 1. 1
• 2. 10
• 3. 30
• 4. 50

Question: The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?

• 1. √(HW/π)
• 2. HW/2 (H + W)2
• 3. HW/4 (H + W)2
• 4. 2HW/(H + W)

Question: When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?

• 1. Ejector
• 2. Blower
• 3. Injector
• 4. Airlift

Question: Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?

• 1. m
• 2. n
• 3. n-m
• 4. n/m

Question: A globe valve is the most suitable for applications, in which____________________?

• 1. Fluid flow control is required
• 2. Fluid contains dispersed solid particles
• 3. Valve is required to be either fully open or fully closed
• 4. One way flow is required

Question: Pick out the wrong statement?

• 1. The vacuum pressure is always the negative gauge pressure
• 2. The pressure of the liquid measured by a piezometer tube is the gauge pressure
• 3. Manometric liquid should have high surface tension
• 4. The point at which the resultant pressure on an immersed surface acts, is known as the centreof gravity

Question: Pick out the wrong statement?

• 1. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp
• 2. In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively
• 3. Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion
• 4. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

Question: Pick out the correct statement?

• 1. A forced vortex occurs when fluid rotates as a solid about an axis
• 2. In laminar flow, Newton’s law of viscosity does not apply
• 3. A free vortex occurs, when fluid rotates as a solid
• 4. In turbulent flow, there are neither cross-currents nor eddies

Question: Pick out the wrong statement?

• 1. The form drag is dependent upon the occurrence of a wake
• 2. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance
• 3. An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity
• 4. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.