Question: The fluid forces considered in the Navier Stokes equation are__________________?

• 1. gravity, pressure and viscous
• 2. gravity, pressure and turbulent
• 3. pressure, viscous and turbulent
• 4. gravity, viscous and turbulent

Question: For pipes, laminar flow occurs when Roynolds number is__________________?

• 1. less than 2000
• 2. between 2000 and 4000
• 3. more than 4000
• 4. less than 4000

Question: At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_______________?

• 1. minimum
• 2. maximum
• 3. zero
• 4. could be any value

Question: Two pipe systems can be said to be equivalent, when the following quantites are same______________?

• 1. friction loss and flow
• 2. length and diameter
• 3. flow and length
• 4. friction factor and diameter

Question: In a forced vortex, the velocity of flow everywhere within the fluid is__________________?

• 1. maximum
• 2. minimum
• 3. zero
• 4. non-zero finite

Question: Select the correct statement ?

• 1. Local atmospheric pressure depends upon elevation of locality only
• 2. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
• 3. Local atmospheric pressure is always below standard atmospheric pressure
• 4. A barometer reads the difference be-tween local and standard atmospheric pressure

Question: Choose the wrong statement ?

• 1. The center of buoyancy is located at the center of gravity of the displaced liquid
• 2. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
• 3. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions
• 4. All floating bodies are stable

Question: Choose the wrong statement?

• 1. any weight, floating or immersed in a liquid, is acted upon by a buoyant force
• 2. Buoyant force is equal to the weight of the liquid displaced
• 3. The point through which buoyant force acts, is called the center of buoyancy
• 4. Center of buoyancy is located above the center of gravity of the displaced liquid v

Question: Choose the wrong statement?

• 1. fluids are capable of flowing
• 2. fluids conform to the shape of the con-taining vessels
• 3. when in equilibrium, fluids cannot sustain tangential forces
• 4. when in equilibrium, fluids can sustain shear forces

Question: Choose the wrong statement________________?

• 1. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
• 2. Viscosity is due primarily to interaction between fluid molecules
• 3. Viscosity of liquids decreases with in-crease in temperature
• 4. Viscosity of liquids is appreciably affected by change in pressure