According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

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

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

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