# Consider the following statements: 1. Flow is established in a pipe when the boundary layer…

Consider the following statements:

1. Flow is established in a pipe when the boundary layer

thickness is equal to the radius of the pipe.

2. For laminar flow, the friction factor in DarcyWeisbach

equation varies inversely as the Reynolds number.

3. For turbulent flow, the friction factor in DarcyWeisbach

equation varies inversely as the square of Reynolds number.

4. When the boundary is rough, the friction factor varies

with the relative roughness of the pipe.

Of these statements,

(a) 1, 2 and 3 are correct

(b) 1, 2 and 4 are correct

(c) 2, 3 and 4 are correct

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Consider the following statements:

1. Flow is established in a pipe when the boundary layer

thickness is equal to the radius of the pipe.

2. For laminar flow, the friction factor in DarcyWeisbach

equation varies inversely as the Reynolds number.

3. For turbulent flow, the friction factor in DarcyWeisbach

equation varies inversely as the square of Reynolds number.

4. When the boundary is rough, the friction factor varies

with the relative roughness of the pipe.

Of these statements,

(a) 1, 2 and 3 are correct

(b) 1, 2 and 4 are correct

(c) 2, 3 and 4 are correct

(d) 1, 3 and 4 are correct

»