Department of Mechanical and Materials Engineering
University of Jeddah
ENME 457: Pumps & Hydraulics (SEM-III 2022-23)
assignment 1: Fluid power, fluid machinery & Fundamentals of pump (due date: 18.04.23)
Part A: Fluid Power
- Define the term fluid power. Explain any five benefits of fluid power for the users.
- Compare between a hydraulic and a pneumatic systems.
- What are the major functions of fluid power? State any five fluid power machineries and their end users.
- Sketch the basic hydraulic system and state its major components.
- Sketch and explain the spring load accumulator.
- How are the control valve classified? Write the classification of the control valve.
- Name and compare the four different types of power systems.
- An elevator raises a 3000 lb load through a distance of 50 ft in 10s. If the efficiency of the entire system is 80%, how much input horsepower is required by the elevator hoist motor?
- How much torque is delivered by a 2 hp, 1800 rpm hydraulic motor?
Part B: Fluid Machinery
- Define turbo-machine. Explain the working principle of power absorbing and power producing turbo-machines.
- Briefly discuss how the turbo-machines are classified in terms of i) power, ii) pressure change, iii) path of flow and iv) housing system.
- Briefly explain the principal parts of a turbo machine.
- Enlist the major characteristics of a positive displacement machine.
- What is positive displacement machine? How does it compare with a turbo-machine with respect to the following aspects: i) Mode of action, ii) Operation, iii) Mechanical features, iv) Efficiency of energy conversion, and v) Volumetric efficiency?
Part C: Fundamentals of pumps
- Define pump and briefly state its importance and classifications.
- Write a short note on Noria, Egyptian and Archimedean pumps.
- Define positive displacement pump and briefly state its characteristics and working principle.
- Define dynamic pump and briefly state its characteristics and working principle.
- Compare between dynamic and positive displacement pumps.
NOTE: You should study all the questions listed above for exam and quiz. For submission of assignment, answer the bold questions only. Your answer must be handwritten!
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