Test yourself

Quiz

This quiz includes the key points, that have been covered in this webpage:

Keep a note of the answers you think are correct and mark them at the end, by clicking on the quiz answers.

• 1. What does flat plate parallel to the flow depend on?

     1. Wall Shear

     2. Pressure

     3. Velocity

     4. Flowrate

  2. What does flat plate normal to the flow depend on?

• • 1. Wall Shear

    2. Pressure

    3. Velocity

    4. Flowrate

• 3. What does flat plate normal to the flow independent of?

• • 1. Velocity

    2. Pressure

    3. Wall Shear that acts parallel to the free stream flow

    4. Wall Shear that acts normal to the free stream flow

• 4. How does the presence of a boundary affect the velocity and hence overall mass flow rate in the boundary layer?

• • 1. Increase the velocity

    2. Decrease the velocity

    3. It stays the same

• 5. How does the presence of a boundary layer affect the overall momentum of the flow?

• • 1. Decrease the momentum

    2. Increase the momentum

    3. It stays the same

• 6. What is the relationship between coefficient of friction and the roughness in turbulent flow?

• • 1. Coefficient of friction increase with roughness in turbulent flow

    2. Coefficient of friction decrease with roughness in turbulent flow

    3. Coefficient of friction increase stays the same with roughness in turbulent flow

• 7. Frictional drag depends on what kind of area?

• • 1. Projected frontal area

    2. Surface area normal to the flow

    3. Surface area parallel with the flow

    4. Cross sectional area

• 8. Pressure depends on what kind of area?

• • 1. Surface area parallel with the flow

    2. Surface area normal to the flow

    3. Projected frontal area

    4. Cross sectional area

• 9. What happens to the drag at terminal velocity?

• • 1. Drag is greater than the weight of the body

    2. Drag is infinite

    3. Drag is zero

    4. Drag is equal to the weight of the body

• 10. What occurs in the low pressure region?

• • 1. Recirculation and backflow

    2. Circulation and frontflow

    3. Nothing

    4. Recirculation and no flow

• 11. How does streamlining decrease pressure drag?

• • 1. By delaying boundary layer separation

    2. By increasing boundary layer separation

    3. It doesn’t

    4. By being smoother