In flow through a pipe, the transition from laminar to turbulent flow does...

Q.

In flow through a pipe, the transition from laminar to turbulent flow does not depend on

A. Velocity of the fluid

B. Density of the fluid

C. Diameter of the pipe

D. Length of the pipe

Answer & Explanation

The transition from laminar to turbulent flow is decided based on the value of Reynolds number,
Re= ρvD/µ
where,
ρ = density of fluid
v = velocity of fluid
D = diameter of pipe
Thus, It is independent on length of pipe.

Thus correct option is: D.

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Q.

Select wrong statement regarding viscosity

A. In general, the viscosity of both liquids and gases ceases to be a function of pressure

B. Viscosity of the liquids decreases with increase in temperature

C. Viscosity of gases increases with increase in temperature

D. None of the above

Answer & Explanation

Q.

The phenomenon of rise or fall of liquid surface relative to adjacent general level of liquid is called capillarity. It is associated with

A. Angle of contact

B. Surface tension

C. Both A and B

D. None of the above

Answer & Explanation

Q.

The partial pressure exerted by the molecules of a liquid confined in a closed vessel is known as

A. Gauge pressure

B. Ambient pressure

C. Vapor pressure

D. Absolute pressure

Answer & Explanation

Q.

Water hammer in pipes takes place when

A. Fluid is flowing with high velocity

B. Fluid is flowing with high pressure

C. Flowing fluid is suddenly brought to rest by closing a valve

D. Flowing fluid is brought to rest by gradually closing a valve

Answer & Explanation

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In flow through a pipe, the transition from laminar to turbulent flow does...

Q. In flow through a pipe, the transition from laminar to turbulent flow does not depend on

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In flow through a pipe, the transition from laminar to turbulent flow does not depend on

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