fluid mechanic fluid lab

1. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 1: Performance of Pelton Wheel Turbine
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. What is Pelton Wheel Turbine? State an example of its application. [2 marks]
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2. Describe the working principle of the Pelton Wheel turbine. [2 marks]
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3. Why is it necessary to wait for the speed of the buckets to stabilize before taking the
readings? [1 mark]
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4. What is the weight of the weight hanger? [1 mark]
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5. How do you measure the flow rate in this Experiment? [1 mark]
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6. What is a tachometer? How can you achieve a better accuracy? [2 marks]
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7. What is the equation use to calculate the theoretical efficiency of Pelton Wheel
Turbine? [1 mark]
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2. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 2: Flow Visualization
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. Define Timelines, Pathlines, Streaklines and Streamlines. [4 marks]
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2. Explain about steady and non-steady flow. [2 marks]
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3. Define ‘lift’ and ‘drag’. [2 marks]
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4. Explain about boundary layer. [2 marks]
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3. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 3: Characteristic of Venturi Meter
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. Write the Continuity equation and Bernoulli theorem equation used in this
experiment? [3 marks]
2. How do these equations explain the change in velocity and pressure along the
venturi meter? [2 marks]
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3. What is C? How do you calculate C? [2 marks]
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4. State the theoretical value of C for venturi meter. [1 mark]
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5. Define Total Head. [1 marks]
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6. State whether the discharge valve is open or close based on the level of the
manometer tubes in the diagram below. [1 marks]
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4. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 4: Reynolds Number
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. What is Reynolds Number? [1 mark]
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2. Describe the 3 types of flow conditions; laminar, transition and turbulent. You can
draw its pattern to help your explanations. State the range of Reynolds number for
each flow type. [3 marks]
3. What are the parameters affecting Reynolds Number? [1 mark]
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4. Define kinematic viscosity. How do you obtain its value for this experiment? [2 mark]
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5. What is the purpose of the dye? [1 mark]
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6. What is the use of overflow pipe? Why is it important? [2 marks]
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5. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 5: Head Loss Due to Pipe Friction
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. What equation can be used to calculate head loss due to pipe friction in a circular
pipe? [1 mark]
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2. Write the equation [1 mark]
3. Define head loss. What are the factors affecting head loss? [2 marks]
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4. What is the relationship between pipe friction coefficient ‘f’ and ‘λ’? [1 marks]
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5. How many pipes (with different diameter) are used for this experiment? And what is
the diameter of the pipes? [2 mark]
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6. Write the equation to calculate f [1 marks]
7. What is ‘Moody diagram’? [2 marks]
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6. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 6: Head Loss Due to Pipe Fitting
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. Define head loss in pipes and identify the causes of head loss. [2 marks]
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2. Give 4 examples of pipe fitting? [2 marks]
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3. State the pipe condition for the diagram below. (Sudden contraction or sudden
enlargement) The arrow indicates the direction of water flow. [2 marks]
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4. How do you find the theoretical value of loss coefficient for sudden contraction and
sudden enlargement in this experiment? [2 marks]
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5. What is the relationship between head loss and velocity head? Write the equation.
[2 marks]
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7. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 7: Pump Performance - Single Pump
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. What is a pump? Name 2 types of pump. [2 marks]
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2. Explain the working principle of a centrifugal pump (including the energy changes in
the process). [3 marks]
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3. Centrifugal pump is one of the most widely used pumps for transferring liquids. Give
2 reasons why this is true. [2 marks]
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4. What is pump shutoff head? [1 marks]
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5. What is ‘priming’? Why priming is required if a liquid being pumped from a reservoir
located below a centrifugal pump? [2 marks]
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8. MEHB221 Fluids Mechanics Lab 2015
Prelab Questions - Experiment 8: Pump Performance - Double Pumps
Name: ______________________________ Section (Group): ______________
SID: _______________ Date: _______________
1. What is a pump? Name 2 types of pump. [2 marks]
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2. Explain the working principle of a centrifugal pump (including the energy changes in
the process). [4 marks]
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3. What is the advantage and disadvantage using two pumps operating in series?
[2 marks]
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4. What is the advantage and disadvantage using two pumps operating in parallel?
[2 marks]
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