2) Consider a hollow sphere having small holes on its sides with a piston inside. Practice Test: Question Set - 16 1. When the operation of two hydraulic cylinders is required to be performed in sequence by using a single direction valve called pilot-operated sequence valve is used. Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. Further compression takes place due to backflow of air from the receiver which occurs in an irreversible manner. • Modeling and Simulation – Hydraulic and pneumatic systems generally have more The air after compression in LP cylinder (ie. Practice Test: Question Set - 01 1. For linear motion, cylinders are used. Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? When the spool lifts flow floe is divorced from the secondary port to operate the second phase. Construction: A simple vane compressor consists of a rotor mounted eccentrically in the body and supported by ball and roller bearings in the end covers of the body. As the piston driven down, the inlet valve opens and a volume of fluid (determined by the cross-section area of the piston and the length of stroke) is drawn into the cylinder. 2 to 3 hp. On the gas side, the screw plug allows control of the charge pressure and charging of the accumulator by means of a charging device. Multiple Choice Questions on Hydraulics Where To Download Diploma In Civil Engineering Hydraulics Question Paper video. The oil is further carried around the housing in chambers due to gears rotation towards due to teeth mesh which reduces the volume between mating teeth. A second smaller valve 2 Known as 4/2 pilot valve has been added to allow the main valve to be operated by system pressure. Components of Hydraulic/Pneumatic Systems 1. it doesn’t require any lubrication, as it is very much required in all mechanical drives. Stainless steel tubing is used in certain areas of many aircraft fluid power systems. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a. a) Check … Oil is discharged due to the meshing of gears. No, when the piston moves upward during the delivery stroke the air is compressed and the pressure increases till it reaches the discharge pressure. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. Explain with neat sketch vane compressor. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Example: pressures, Injection moulding, Machine. Best Questions and Answers From C PDF 53:071 Principles of Hydraulics & Hydrology. Fig. velocity of jet at vena contracta to the theoretical velocity, Loss The second gear is driven as it meshes with the driven gear. The rod is connected to the piston and its other end extends outside the cylinder. In this valve, the fluid flows freely through the primary passage to operate the first phase until the pressure setting of the sequences valve is reached. 2. What in 5/2 DCV? the principle operation of pilot operated valve is shown in the figure. Hydraulics and Pneumatics Test Set 1. This article is about(Hydraulics and Pneumatics Question paper) based on the hydraulic and pneumatic subject this contains model questions and answers from previous exams, This article is just to prepare for the exams. The oil at atmospheric pressure enters into the chamber through the inlet port. But sometimes, the air is required at a high pressure. Pneumatic Control System Multiple Choice Questions and Answers; 36. 16. Answer: Option C The signal pilot valves are also termed as the signal generator. Ans. Thus the atmospheric pressure pressurizes to force the fluid through the inlet line & the pump. Threrfource a direction by a pilot valve is used. Answer: Option C. Practice Test: Question Set - 07 1. This ensures easy exhausting of the valve. What is the function of a Direction control valve? Define fluidics & mention the needs for fluidics. Fluid and its types Pneumatics means gas or air. Oil pressure is fed only on one side of the cylinder either during extension or retraction. For rotary motion, motors are used. State the advantages and disadvantages of the poppet valve. This signal is provided to the pilot operated valve by means of an air impulse. This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. In an external mouthpiece, the absolute pressure head at vena contracta is _____ the atmospheric pressure head by an amount equal to 0.89 times the height of … Hydraulic systems use the ability of a fluid to distribute an Hydraulic pump (compressor in pneumatics): converts the mechanical energy into hydraulic energy by forcing fluid from the reservoir into the system. use air-over-oil power units. U-packing is used to prevent leakage between the piston & the barrel. Fig. This figure shows the construction of gear pump. This makes the piston to move left. Mention types of the directional control valve and method of their actuation symbols. If port A is connected to an actuator, port P to a source of pressure & port Ex is open to exhaust, the valve will control the flow of air to port A. Pneumatic and Hydraulics ... Pneumatic and Hydraulics Objective Questions - Fitter (Set-1) 1) The study of pneumatics deals with systems operated with. 1. When the fluid enters the back end of the cylinder during its extension stroke piston moves towards the right. 1 to 2 hp. Answer: The figure is shown a simple piston pump called a positive displacement or hydrostatic pump. At this stage discharge valve opens and the air is delivered to the container and once again the same cycle is repeated. Explain the construction & working of the single acting cylinder of the pneumatic system. When the start button is pressed, valve 2 changes over pressurized Z, by the impulse of air energy, causing valve 1 to energize and the ram to extend. This type of projection is when projectors are parallel to each other, but are at an angle other th... Chain Drives MCQ Practice Test: 1. Fluid: oil for hydraulic systems, air for pneumatics. It offers a wide range of speed control which is difficult to be obtained on the machine drive. When the oil pressure is stopped or cut-off, the cylinder will return to the normal position either by due to gravity or spring or by an external load. When a body is placed over a liquid, it will sink down if (A)  Gravitational force is equal to the... Hydraulics Multiple Choice Questions and Answers - Set 26, The multiple choice questions on hydraulics examtime quiz. 11. 9. Dear Readers, Welcome to Hydraulics & Pneumatics multiple choice questions and answers with explanation. It covers the inlet of the line connection when the diaphragm is fully stretched. Hydraulic and pneumatic circuits: perform the same way for all functions. Answer Explanation. (b) radial … Mechanical energy is given to the pump via a prime mover such as an electric motor. The poppet valve is simple and also easy to operate. Mention differences between hydraulic & pneumatic systems. 18. In position-1, when the spool is actuated towards outer direction port ‘P’ connects to ‘B’ and ‘S’ remains closed while A gets connected to ‘R’. Specific need of control engineering forced engineerings for a solution within the fluid power system. 5. Inthe other external, the large diameter of the spool closes the path between A & B, the flow path is blocked. velocity of flow is uniform across any cross-section of the pipe, Departmental Interview Questions Practice Tests, Objective Mechanical Engineering & Technical Interview E-book, Civil Engineering MCQ with Interview Questions and Answers, Objective Electrical Engineering with Interview Questions and Answers, SSC JE Previous Years Solved Papers (FREE), Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07, Strength of Materials Objective Questions with Answers - Set 10, I.C Engines Multiple Choice Questions with Answers - Set 02, Structural Analysis Objective Type Questions and Answers - Set 01, Estimating and Costing Objective Questions and Answers - Set 01, Engineering Drawing MCQ Practice Test - Set 01, Chain Drives Multiple Choice Questions and Answers, Automobile Engineering Objective Questions with Answers - Set 16, Friction Clutches Multiple Choice Questions, Hydraulics and Fluid Mechanics MCQ - Set 01. The built-in spring is designed in such a way that it will come back to its start position with sufficiently high speed under no load conditions. Sketch & explain pressure relief valves. Copper pipe & tubing are used fluid power lines.it is having high resistance to corrosion & easily drawn or bent. Choice of working media: Electrical current (electricity) Fluids (hydraulics) Compressed air (Pneumatics) A combination of the above Selection criteria for the working section: Force Stroke Type of motion (linear, swivelling, rotating) Speed Service life Safety and reliability Energy costs Controllability Storage Choice of control media: The pneumatic system uses air as the gas medium which is very abundant & readily exhausted into the atmosphere after completing its assigned task. 8. Piston ends are tapered. Friction Clutches Objective Practice Test 1. 14. 2. In brack system of automobiles, railway coaches, wagons, printing presses. 12. Pilot controlled double acting cylinders using 4/2 D.C valve in pneumatics. 6. oil. Hydraulic and pneumatic print reading: Skill Level: Entry: Test Format: 35 Items , Multiple-choice: Language: English . An actuator to convert the pressure of oil into mechanical force. Hydraulics means fluid form and the fluid can be defined as a substance that can flow and does not maintain a fixed shape. Fluids display properties such as. Practice Test: Question Set - 01 1. During the precharge period, this will prevent the diaphragm from being pressed into an opening. When the system pressure reaches a valve which is high enough to force the poppet off its seat this permits the flow from the outlet to the tank until the system pressure drops to set the valve. With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. When each blade arrives at the delivery passage, delivery begins. 7. Set 1; Set 2; Set 3; Set 4 ) ) ) ) Post navigation. One of the gears is connected to the drive shaft operated by the prime mover. 26. Explain Basic methods of transmission of power in brief. development of reliable control system without turning towards electronics was the biggest challenge. 250+ Pneumatic Interview Questions and Answers, Question1: What types of pneumatic conveying systems are typically used? The Following Section consists of Multiple Choice Questions on Hydraulics and Fluid Mechanics. A pump to force the oil through the system. The exhaust air on the piston rod side is exhausted through the drain hole. Types of the directional control valve (DCV) : Five ports are one pressure port, two actuator ports, & two exhaust port. Set 1 In this type, gears are meshing with each other. 1. Practice Test: Question Set - 10 1. Two ports, inlet and delivery are located on the opposite ends of the gear casing. By using chain which mounted on sprockets. Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic & pneumatics. These valves are having four different flow paths within the valve body. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of (a) high initial and maintenance cost (b) lower discharge (c) The figure shows a simple pressure relief valve consisting of poppet held seated in the valve body by a heavy spring. In such cases either we have to employ a large pressure ratio or compress the air in two or more cylinders in series with intercooler between the stages are used. Organized into eight chapters, this book begins with an overview of industrial prime movers. Saif M. is a Mechanical Engineer by profession. It can also be stated that “when pressure is applied to the fluid which is confined to flow in all the directions, then that fluid transmit the same pressure in all direction at the same rate”. Reservoir: storage tank. pneumatics and hydraulics exam questions and answer pdf. (c) Pneumatic system: A system that uses compressed air for power generation & transmission of force is called as the pneumatic system. hydraulics civil engineering questions and answers. air. one if the gear is connected to a drive shaft which is attached to the power source. components of hydraulic and pneumatic operating systems. That’s it Thanks for reading our article on Hydraulics and Pneumatics Question paper. 1. 61 TOP MOST HYDRAULIC MACHINES – Mechanical Engineering Multiple choice Questions and Answers All Engineering Exams Study Material, Books and Guidance ER-Exams App Download: - click here Hydraulic Machines Interview Questions and Answers :- 1. Explain the construction and working of Diaphragm Accumulator. Also, the exhaust flow passes freely out of the cylinder from left. solid. Latest Hydraulic Machines Questions and Answers pdf free download 1. pneumatics and hydraulics exam questions and answer pdf. Reduced speed of travel of machine tool elements. Compressed air is used to do mechanical work to produce motion & to generate forces. Top 36 hydraulic interview questions with answers pdf. Write a note on pipe material, types of fittings & connectors in the fluid system. If the required force is too high for manual operation or solenoid, a two-stage process called pilot operation is used. 4. Mention the applications of pneumatics in the engineering field. The valve remains closed when the inlet pressure is less than spring pressure. Ans: External gear pump. (Q2.1) Fig. Description. Answer: Option A This action produces a positive flow of liquid into the system. The single acting cylinder is used in cutting operation ejecting parts, clamping of the workpiece, feeding and lifting. A. Pneumatic-electric elements B. Explain the Pascal’s Law with the equation. 7. Ability to flow and take the shape of the container in which it is filled. As the name indicated it consists of a diaphragm, secured in the shell. Question4: What are some common problems associated with dilute phase pneumatic … 10. water. They are secured to the barrel by tie rods. 13. (a) rectilinear flow. Ans: The intensity of pressure at any point in a fluid at rest is the same non-directions. 22. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. Multiple Choice Questions on Water Resources Engineering. What are the advantages of a hydraulic system? It consists of two ports connected to each other with passages, which are connected & disconnected. To learn more about “how hydraulic works” click here to go howstuffworks.com they have the amazing article on that. 13. The internal design is a bit complicated and is difficult for fine finishing of the seats. (A) The direction and magnitude of the velocity at all points are identical (B) The velocity of successive fluid particles, at any point, is the same at successive periods of time (C) The magnitude and direction of the velocity do not change from point to point in the fluid (D) The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane 24. as a result, parts don’t wear out rapidly. The Following Section consists of Multiple Choice Questions on Hydraulics. 11. It gives an on-off function. Ans: Hydraulic system: It uses the liquid as its medium. manual pneumatic source com. divergent portion of a Venturimeter is made longer than convergent portion in It consists of 3 ports connected through passages within a valve body ie. Piping to carry oil from one location to another. This group of elements forms a control path for signal flow, starting from the signal section (input) through to the actuating section 4. 4. Answer: Option C In a centrifugal pump casing, the flow of water leaving the impeller, is. Take the test on Hydraulics and Fluid Mechanics problems. ATM 1122 – Basic Hydraulics and Pneumatics Module 1: Introduction to Hydraulics 9 4 Fundamental laws of Hydraulics All hydraulic systems operate following a defined relationship between area, force and pressure. 6. First, the fresh air is sucked from the atmosphere through the suction filter and inlet valve in low pressure (LP) cylinder during its suction stroke. Air tools like pneumatic drilling, punching riveting etc. Questions on Fluid Power in Machine Tools, Hydraulic Elements in Design of Circuits, Accumulators and Intensifiers, Fluid Power in Machine Tools, Accumulators and Intensifiers, Hydraulic Elements in Design of … Question3: What are some common problems associated with dense phase pneumatic conveying? 8. Objectives When you have completed this chapter, you will be able to do the following: 1. It states that “The intensity of pressure at any point n a fluid at rest, is the same in all direction”. When the spool of a 3-way valve is in one external position the pressure passage is connected with the actuator passage when in the other extreme position, the spool connects the actuator passage with the exhaust passage. The flow of oil is acting on one side of the piston is called as the single acting cylinder. Answer: Option A 20. The function of this valve is to pressurise & exhaust one actuator port. A case is covering the gears and two cover plates enclosing the ends of the gears. These valves provide the same basic control of flow paths as in four-way directional valve have individual exhaust ports. (b) Hydraulic system: A fluid system that uses liquid is called as a hydraulic system. Basic Hydraulic Test Questions And Answers PDF Download. Px = Intensity of horizontal pressure on the element of the liquid, Py = Intensity of vertical pressure on the element of the liquid, Pz = Intensity of pressure diagonal of the triangular elements of the liquid. 1. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. In one external spool position, Port A is open to port B, the flow path through the valve is open. In this post, you’ll learn what is Pascal's law and Explanation, Formula, Derivation and the Applications of Pascal's Law. port A, port P &port Ex. Ans: Differences between hydraulic & pneumatic system : Fluidics: Fluidics is a part of the fluid power technology that develops a totally reliable hydrauic& pneumatic control system using fluid flow phenomena in components & circuits to perform a variety of control functions such as sensing, logic, memory & timing. There are different types of connectors & they are: W-F-B-T-F-F-S-C. A single stage reciprocating when the piston moves downwards during the suction stroke, the air is drawn into the cylinder through the inlet valve. This is very useful for the following examinations. Gears are mounted on a shaft supported by the bearing in the end covers. 27. The pump forces the fluid into the hydraulic system. The subject which deals with the area of fluid logic is called fluidics. Common faults in the hydraulic systems are: Ans. Unlike roots blower, some or all of the compression is obtained before the trapped volume is opened to delivery. Fluid lines: transport the fluid to and from the pump The liquid rises to the same level in all of the tubes, regardless of the shape or angle of the tube. 2nd year Civil Diploma - Hydraulics - Chapter 2 to 8: Question Bank (part 1) Hydraulics is an important field in Civil Engineering that has to … Explanation : The study of pneumatics deals with systems operated with air. 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