# In the mody diagram shown in figure below , friction factor for turbulent flow in a smoth pipe is given by the curve is

1.  A

2.  B

3.  C

4.  D

4

D

Explanation :
No Explanation available for this question

# When pressure p, flow rateQ, diameter D, and density d, a dimensional group is represented by

1.  pQ2/dD4

2.  p/dQ2D4

3.  pD4d/Q2

4.  pD4/dD2

4

pQ2/dD4

Explanation :
No Explanation available for this question

# Turbulent flow is hydraulically smooth if ratio (height of roughness projection/thickness of laminar sub layer) is less than

1.  1.00

2.  0.75

3.  0.50

4.  0.25

4

0.25

Explanation :
No Explanation available for this question

# Bluff body surface

1.  Is smooth so that friction can be neglected

2.  Coincides with stream lines

3.  Does not coincide with stream lines

4.   Perpendicular to streamlines

4

Does not coincide with stream lines

Explanation :
No Explanation available for this question

# The velocity distribution in the turbulent boundary layer follows

1.  Straight line law

2.  Parabolic law

3.  Hyperbolic law

4.  Logarithmic law

4

Logarithmic law

Explanation :
No Explanation available for this question

# Ratio between inertial forces and the square root of pressure forces is known as

1.  Euler number

2.  Weber number

3.  Froude number

4.  Mach number

4

Euler number

Explanation :
No Explanation available for this question

# Two forces most important in laminar flow between closely parallel plates are

1.  Inertial and viscous

2.  Viscous and pressure

3.  Gravity and pressure

4.  Pressure and inertial

4

Viscous and pressure

Explanation :
No Explanation available for this question

# The ratio η=ρ/(du/dy) for turbulent flow is

1.  Physical property of the fluid

2.  Dependent upon flow and density

3.  Viscosity divided by the density

4.  Independent of the nature of flow

4

Dependent upon flow and density

Explanation :
No Explanation available for this question

# For laminar flow in apipe, V is equal to

1.  Umax

2.  0.5 Umax

3.  0.25 Umax

4.  2 Umax

4

0.5 Umax

Explanation :
No Explanation available for this question

# Crude oil of kinematic viscosity 2.25 flows through a 20 cm diameter pipe, rate of flow being 1.5liter/sec. The flow will be

1.  Laminar

2.  Turbulent

3.  Uncertain

4.  None of these

4