FLUID MECHANICS AND TURBO MACHINERY

The flow characteristics of a channel does not change with time at any point. What type of flow is it?

• Steady flow

• Uniform flow

• Laminar flow

• Turbulent flow

The Reynolds number for a flow in a channel is 1000. What type of flow is it?

• Laminar

• Turbulent

• Transition

• Steady

The ratio of inertia force and gravitational force is called as ______

• Reynolds Number

• Stokes Number

• Froude Number

• Eulers Number

The Froude’s number for a flow in a channel section is 1. What type of flow is it?

• Sub Critical

• Critical

• Super critical

• Tranquil

What is the Froude’s number for a channel having mean velocity 4.34 m/s and mean hydraulic depth of 3m?

• a) 0.4m

• b) 0.6m

• c) 0.7m

• d) 0.8m

Calculate the mean hydraulic radius for a channel having 20m² cross sectional area and 50m of wetted perimeter.

• a) 0.4m

• b) 0.5m

• c) 0.6m

• d) 0.7m

Calculate the mean hydraulic depth of a channel having top width of 7m and cross sectional area of 35m²

• a) 4m

• b) 5m

• c) 6m

• d) 7m

Calculate the Froude’s number for a channel having discharge of 261.03 m³/s, cross sectional area of 42 m² and the top width being 6m.

• a) 0.65

• b) 0.72

• c) 0.38

• d) 0.75

The discharge and velocity of water in a rectangular channel are 75m³/s and 5m/ s respectively. The hydraulic depth being 3m calculate the hydraulic radius.

• a) 1.36m

• b) 1.87m

• c) 1.98m

• d) 2.0m

Calculate the hydraulic diameter for a rectangular duct having 10m width and 6m depth.

• a) 5.5m

• b) 6.5m

• c) 7.5m

• d) 8.5m