Maximum velocity of a one-dimensional incompressible fully developed viscous flow, between two fixed parallel plates is 6 ms-1. The mean velocity (in ms-1) of the flow is

1.  2

2.  3

3.  4

4.  5

View Answer  
4
Correct Answer :

4


Explanation :
No Explanation available for this question

The discharge in m3/s for laminar flow through a pipe of diameter 0.04m having a center line velocity of 1.5m/s is:

1.  3π/50

2.  3π/2500

3.  3π/5000

4.  3π/10000

View Answer  
4
Correct Answer :

3π/10000


Explanation :
No Explanation available for this question

Water is flowing through a horizontal pipe of constant diameter and the flow is laminar. If the diameter of the pipe is increased by 50%keeping the volume flow rate constant, then the pressure drop in the pipe due to friction will decreased by

1.  33%

2.  50%

3.  70%

4.  80%

View Answer  
4
Correct Answer :

80\%


Explanation :
No Explanation available for this question

The parameter which determines the friction factor for turbulent flow in a rough pipe are:

1.  Froude number and relative roughness

2.  Froude number and Match number

3.  Reynolds number and relative roughness

4.  Match number and relative roughness

View Answer  
4
Correct Answer :

Reynolds number and relative roughness


Explanation :
No Explanation available for this question

For steady, fully developed flow inside a straight pipe of diameter D, neglecting gravity effects, the pressure drop Δp over length L and the wall shear stress Tw are related by

1.  Tw = ΔpD/4L

2.  Tw = ΔpD2/4L2

3.  Tw = ΔpD/2L

4.  Tw = 4ΔpL/D

View Answer  
4
Correct Answer :

Tw = ΔpD2/4L2


Explanation :
No Explanation available for this question

In the case of turbulent flow of a fluid through a circular tube (as compared to the case of laminar flow at the same flow rate) the maximum velocity is ………, shear stress at the wall is ………, and the pressure drop across a given length is ………… The correct words for the banks are, respectively:

1.  Higher, higher, higher

2.  Higher, lower, lower

3.  Lower, higher, higher

4.  Lower, higher, lower

View Answer  
4
Correct Answer :

Lower, higher, higher


Explanation :
No Explanation available for this question

A streamlined body is defined as a body about which

1.  The flow is laminar

2.  The flow is along the streamlines

3.   The flow separation is suppressed

4.  The drag is zero

View Answer  
4
Correct Answer :

The flow separation is suppressed


Explanation :
No Explanation available for this question

The predominant forces acting on an element of fluid in the boundary layer over a flat plate in a uniform parallel stream are:

1.  Viscous and pressure forces

2.  Viscous and inertia force

3.  Viscous and body force

4.  Inertia and pressure force

View Answer  
4
Correct Answer :

Viscous and inertia force


Explanation :
No Explanation available for this question

An incompressible fluid flows over a flat plate with zero pressure gradients. The boundary layer thickness is 1mm at a location where the Reynolds number is 1000. If the velocity of the fluid alone is boundary layer thickness sat the same location, in mm will be

1.  4

2.  2

3.  0.5

4.  0.25

View Answer  
4
Correct Answer :

0.25


Explanation :
No Explanation available for this question

In order to have maximum power from a Pelton turbine, the bucket speed must be

1.  equal to the jet speed

2.  equal to the half of the jet speed

3.  equal to twice the jet speed

4.  independent of the jet speed

View Answer  
4
Correct Answer :

equal to the half of the jet speed


Explanation :
No Explanation available for this question
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