Fluid Mechanics - 2 - Mechanical Engineering MCQ

The Dray-Weisbach equation for head loss is valid

For a solid sphere falling under gravity at terminal velocity in a fluid.

For uniform flow in a channel

The relationship between Manning’s coefficient ‘n’ and Chezy’s coefficient 'c' is given by

 If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m, the maximum height of hump without causing afflux will be

For a steep slope profile S₁, the type of flow will be

Pick up the incorrect statement with respect to critical flow

The critical depth of flow in a most economical triangular channel section for a discharge of 1 m ³/sec is given by

If the depth of flow in a channel is 1 m and velocity of flow is 2 m/sec. then the velocity with which an elementary wave can travel down stream

Figure below shoes gradually varied flow in an open chennal with a brake in bed slope

Types of water surface profiles occuring from left to right is 

Which one of the following pairs of situations and types of water surface profiles is not correctly matched?

A discharge of 3.0 m³/s flows in a canal, 2 m side, at a depth of 1.2 m. If the width of the canal is reduced to 1.5 m by a canal transition, then the neglecting losses, the depth of flow after the contraction will be

A hydraulically efficient trapezoidal section of open channel flow carries water at the optimal depth of 0.6m.Chezy coefficient is 75 and bed slope is 1 in 250. What is the discharge through the channel?

Common Data Questions (32 and 33):
A smooth flat plate with a sharp leading edge is placed along a gas free stream flowing at U = 10 m/s. The thickness of the boundary layer at section r-s is 10 mm, the breadth of the plate is 1 m (into the paper) and the density of the gas, p = 1.0 kg/m³ . Assume that the boundary layer is thin, two - dimensional, and follows a linear velocity distribution, u = U (y/δ), at the section r-s, where y is the height from plate.

Q. The mass flow rate in Kg/s accros the section q-r is

A smooth flat plate with a sharp leading edge is placed along a gas free stream flowing at U = 10 m/s. The thickness of the boundary layer at section r-s is 10 mm, the breadth of the plate is 1 m (into the paper) and the density of the gas, p = 1.0 kg/m³ . Assume that the boundary layer is thin, two - dimensional, and follows a linear velocity distribution, u = U (y/δ), at the section r-s, where y is the height from plate.

Q. The integrated drag force in N on the plate, between p-s, is

Linked Data Questions (34 and 35):
Consider fully developed, laminar flow in a circular pipe of radius ‘R’ .The centre - line velocity of the flow is U_m.

Q. The velocity u at a radial distance r from the center line of the pipe is given by

Consider fully developed, laminar flow in a circular pipe of radius ‘R’ .The centre - line velocity of the flow is U_m

Q.The value of the radial distance from the centre line of the pipe at which the velocity would be equal to the average velocity of the flow is