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Sample Exam 12 a
This document is a test for a creative design and innovation class covering hydraulic and pneumatic systems. It contains multiple choice questions, true/false questions, matching, labeling diagrams, short answer questions, and calculations involving hydraulic principles like Pascal's law. The test covers key components of hydraulic systems like reservoirs, pumps, actuators, and valves. It also addresses properties of hydraulic fluids, applications of hydraulics, and comparisons between hydraulic and pneumatic systems.
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Sample Exam 12 a
- 1. Al Riffa HighSchool For Girls للبنات الثانوية الرفاع مدرسة Page 1 Creative Design & Innovation (CDI) Revision-12A Instructor: Fatima Adly Name: Grade: ( ) Date: Part 1: Choice the correct answer 1) A system that uses incompressible liquid to transfer power a. Electrical system b. Hydraulic system c. Pneumatic system 2) Which of the following is NOT a property of a hydraulic fluid a. Incompressible b. Chemically stable c. Has a very high viscosity rate 3) In a hydraulic system, the valve that directs the fluid is called a. Pressure relief valve b. Selector valve c. Non-return valve 4) The correct formula for Pascal’s law a. P = F×A b. F = P×A c. P = 𝐴 𝐹 5) Function of the pressure relief valve a. Automatic cut-out valve b. Prevent failure of components under excessive pressure c. Directional control device 6) In a pneumatic system, the function of the compressor is: a. Increases the pressure of the air b. Decreases the pressure of the air c. Reduces the temperature of the air 7) Application of a basic hydraulic system a. Helicopters b. Fixed wing aircraft c. Car brake system
- 2. Al Riffa HighSchool For Girls للبنات الثانوية الرفاع مدرسة Page 2 Part 2: True or False paPart 3: Match component of the basic hydraulic system to its function Component Function ---- (1) Reservoir (A) A mechanical device that converts mechanical power into hydraulic energy, to generate hydraulic pressure. ---- (2) Pump (B) A one – way valve that normally allows fluid (liquid or gas) to flow through it in one direction only. ---- (3) Linear actuator (C) A container for holding the fluid required to supply the system ---- (4) Selector valve (D) Creates motion in a straight line. ---- (5) Non-return valve (E) A directional control device that ensures the movement of the hydraulic fluid flow in the proper direction. 1) Hydraulic system uses compressed air to transfer power a. True b. False 2) Pascal law states: Pressure in an enclosed container is transmitted equally a. True b. False 3) Good lubrication properties is not an essential property for hydraulic fluids a. True b. False 4) Vegetable-based fluid is inflammable a. True b. False 5) Non-return valve is a two-way valve a. True b. False 6) Accumulator stores energy in the form of hydraulic pressure a. True b. False
- 3. Al Riffa HighSchool For Girls للبنات الثانوية الرفاع مدرسة Page 3 Part 4: Label the diagram Part 5: Short Answer Questions. 1) Compare the three types of hydraulic fluids in terms of safety. -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- 2) What is difference between hand pump and engine driven pump? -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- 3) What are the basic components of a pneumatic system? Briefly describe the function -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- 4) What is the function of the unloading valve? -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- 5) Briefly explain how the Hyperloop works? -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------------
- 4. Al Riffa HighSchool For Girls للبنات الثانوية الرفاع مدرسة Page 4 6) State whether the terms below relate to a hydraulic system or a pneumatic system. • Pressurized liquid is used to change power from one form to another in a hydraulic system / pneumatic system. • Pascal’s law refers to the principle of a hydraulic system / pneumatic system. • Dental drills use the principle of a hydraulic system / pneumatic system Part 6: Calculations 1) A hydraulic lift lifts a 2000kg car. If the area of the small piston equals 10.5cm2 and the area of the large piston 0.04m2, what force needs to be exerted on the small piston to lift the car? -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- 2) The narrow piston area is 5 m2 and the wide piston area is 50 m2 . If the force applied by the block is 1800 N, find the magnitude of force F to lift the block W? -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------------- Good Luck