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
The self cleansing velocity for all sewers in India is usually
A Less than 1.0 m/sec
B 1.0 m/sec to 1.2 m/sec
C 1.5 m/sec to 2.0 m/sec
D 3.0 m/sec to 3.5 m/sec
With self cleansing velocity in sewers
A Silting occurs at bottom
B Scouring occurs at bottom
C Both silting and scouring occur at bottom
D Neither silting nor scouring occurs at bottom
In sewers designed with self cleansing velocity,
A The bottom is silted
B The bottom is scoured
C Both silting and scouring occur at the bottom
D Neither silting nor scouring occurs at the bottom
Cement concrete sewers are only suitable if non-scouring velocity is between
A 2.5 to 3.0 m/sec
B 3.0 to 4.0 m/sec
C 3.5 to 4.5 m/sec
D 4.5 to 5.5 m/sec
In sewers the highest non-scouring velocity is achieved in
A Glazed bricks sewers
B Cast iron sewers
C Cement concrete sewers
D Stone ware sewers
The suitable cross-section of sewers to carry combined flow, is
A Circular
B Egg shaped
C Rectangular
D Horse shoe shaped
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

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