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?

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)
NAME: ID:

SECTION:

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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