Related Questions

Fanning friction factor equation applies to the __________ fluid flow.
A Non-isothermal condition of
B Compressible
C Both A and B
D Neither A nor B
Fanning friction factor for laminar flow of fluid in a circular pipe is
A Not a function of the roughness of pipe wall
B Inversely proportional to Reynolds number
C Both A and B
D Neither A nor B
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
A Brings about no further reduction of
B Increases
C Decreases
D None of these
Stanton diagram is a
A log-log plot of friction factor against Reynolds number
B log-log plot of relative roughness against Reynolds number
C semi-log plot of friction factor against Reynolds number
D semi-log plot of friction factor against relative roughness
Prandtl and Reynolds analogy are same, when Prandtl number is
A 0.5
B 1
C > 2
D 1.5
The open "Sigrees" or coal stoves often require fanning to sustain burning because of
A Tendency of carbon dioxide to form a layer along with dust smoke
B Lack of oxygen in the surroundings of sigrees
C Accumulation of smoke and dust over the sigrees
D Interrupted release of moisture from the material
All analogy equations connecting friction factor and heat transfer co-efficient apply only to
A Wall or skin friction
B Form friction
C Both A and B
D Turbulent flow
For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)
A $$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$
B $$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
C $$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$
D $$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
A Relative roughness
B Absolute roughness
C Friction co-efficient for flows at equal Reynold number
D All of the above
The viscous friction co-efficient, in force-voltage analogy, is analogous to
A charge
B resistance
C reciprocal of inductance
D reciprocal of conductance
E none of the above

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