Fluid Mechanics

611.Transition length for turbulent flow in smooth pipe is equal to _________ times the pipe diameter.

1. 0.5
2. 5
3. 50
4. 500

View answer

612.Turbine impeller

1. Produces only radial current
2. Produces only tangential current
3. Is effective over wide range of viscosities
4. Does not produce tangential current

View answer

613.Turbulent flow generally occurs for cases involving

1. Highly viscous fluid
2. Very narrow passages
3. Very slow motion
4. None of these

View answer

614.Two dimensional stream function

1. Relates velocity and pressure
2. Is constant along a stream line
3. Is constant along an equipotential surface
4. None of these

View answer

615.Two liquids manometer is used for measuring small pressure differences in

1. Liquids
2. Gases
3. Mixture of hydrocarbons
4. None of these

View answer

616.Two piping system are said to be equivalent, when the _________ are same.

1. Fluid flow rate & friction loss
2. Length & friction factor
3. Diameter & friction factor
4. Length & diameter

View answer

617.U_mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U_mf to 2.5 U_mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

1. Drag on particles
2. Drag on column walls
3. Bed height
4. Bed voidage

View answer

618.Unit of mass velocity is

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

View answer

619.Unsteady non-uniform flow is represented by flow through a/an

1. Long pipe at constant rate
2. Long pipe at decreasing rate
3. Expanding tube at increasing rate
4. Expanding tube at constant rate

View answer

620.Unsteady uniform flow is represented by flow through a/an

1. Long pipe at constant rate
2. Long pipe at decreasing rate
3. Expanding tube at increasing rate
4. Expanding tube at constant rate

View answer