Related Questions

The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
A 0.423 D
B 0.577 D
C 0.223 D
D 0.707 D
Most commonly used joint in the underground pipe lines is the
A Sleevejoint
B Coupling
C Flange
D Expansion joint
The material commonly used for sheaths of underground cables is
A Lead
B Rubber
C Copper
D Iron
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
A Reduced
B Increased
C Zero
D None of these
What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?
A 0.5
B 0.67
C 1
D 2
The velocity at which the flow changes from laminar flow to turbulent flow is called
A Critical velocity
B Velocity of approach
C Sub-sonic velocity
D Super-sonic velocity
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
A Ductility
B Impact strength
C Machinability
D Melting point
Which one among the following forces is most powerful in determining movement of wind including its velocity ?
A Gravitational force
B Centrifugal force
C Frictional force
D Pressure gradient force
Which of the following is not a result of underground water activity?
A Stalactites
B Stalagmites
C Sink holes
D Fiords

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