11. 22. What are the common faults in the hydraulic system? It provides the great flexibility of locating different parts at widely separated places. 8. The figure shows a simple pressure relief valve consisting of poppet held seated in the valve body by a heavy spring. Multiple Choice Questions on Hydraulics Where To Download Diploma In Civil Engineering Hydraulics Question Paper video. 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. 61 top hydraulic machines mechanical engineering. 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. Explain the construction and working of Diaphragm Accumulator. components of hydraulic and pneumatic operating systems. It generates forces & transmits motion using hydraulic fluids. Unlike roots blower, some or all of the compression is obtained before the trapped volume is opened to delivery. Answer: Option D Understand the operating principles of hydraulic systems. Piston ends are tapered. What is the function of a Direction control valve? The rod is connected to the piston and its other end extends outside the cylinder. 3. Ability to flow and take the shape of the container in which it is filled. Sketch & explain pilot-operated sequence valve. 13. 10. 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’. It can be defined as a branch of fluids power in which gas is used as a fluid. (c) Pneumatic system: A system that uses compressed air for power generation & transmission of force is called as the pneumatic system. 17. Also explore over 82 similar quizzes in this category. Pilot controlled double acting cylinders using 4/2 D.C valve in pneumatics. To learn more about “how hydraulic works” click here to go howstuffworks.com they have the amazing article on that. Fig. As the teeth pass the inlet port, the liquid is passed between the teeth & housing. 14. Answer: Option C Explanation : The study of pneumatics deals with systems operated with air. But sometimes, the air is required at a high pressure. The piston exerts equal pressure on the surface of the water. 3) The liquid flows into the large container at the bottom, pressure pushes the liquid equally up into the tubes above the container. Answer: Option D During the precharge period, this will prevent the diaphragm from being pressed into an opening. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. Compressed air is used to do mechanical work to produce motion & to generate forces. Here below find the document for important 300 Hydraulics and Fluid Mechanics MCQ questions study materials as pdf. A tank (reservoir) to hold the hydraulic oil. Practice Test: Question Set - 01 1. This makes the piston to move left. Blades are mounted on the slotted rotor and are usually non – metallic, made of fibre or carbon. 2. 12. Saif M. is a Mechanical Engineer by profession. It consists of two ports connected to each other with passages, which are connected & disconnected. At the same time, the spool connects the other actuator port with the exhaust port. • Modeling and Simulation – Hydraulic and pneumatic systems generally have more For linear motion, cylinders are used. 5. Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? 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. Hydraulic and pneumatic circuits: perform the same way for all functions. Fig. have a dedicated power unit. Mechanical Engineering - Pneumatic-hydraulic cylinder Is Pneumatic 1 Answers are available for this question. Answer: Option C 15. The mode of transmission of force in a soli and in a liquid is as shown in fig. 14. Explain the Pascal’s Law with the equation. Explain with neat sketch spring load accumulator. U-packing is used to prevent leakage between the piston & the barrel. By using chain which mounted on sprockets. Friction Clutches Objective Practice Test 1. The valve remains closed when the inlet pressure is less than spring pressure. Explain Basic methods of transmission of power in brief. What in 5/2 DCV? 27. Pneumatic systems usually do not exceed: 1 hp. Answer is : air. This is a test of the ability to read hydraulic and pneumatic prints and drawings. use air-over-oil power units. hydraulics civil engineering questions and answers. Practice Test: Question Set - 10 1. Answer: Option D 15. 6. He is also an author and editor at theengineerspost.com. 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 … Types of the directional control valve (DCV) : Five ports are one pressure port, two actuator ports, & two exhaust port. Ans. Set 1 Also, the exhaust flow passes freely out of the cylinder from left. Making the air to fill a volume after passing through a restriction C. Elongating the path of air D. Any of the above Mechanical energy is given to the pump via a prime mover such as an electric motor. Hydraulic pump (compressor in pneumatics): converts the mechanical energy into hydraulic energy by forcing fluid from the reservoir into the system. Reduction heat due to compression by using intercoolers. Following are the 7 main difference between hydraulics and pneumatic: In hydraulics and pneumatics, hydraulics is liquid and pneumatics is gas. Try this amazing Quiz About Pneumatic Engineering quiz which has been attempted 2572 times by avid quiz takers. Explain with neat sketch. 10. Gears are mounted on a shaft supported by the bearing in the end covers. Fluid power circuits use schematic drawings to: a) Simplify component function details b) Make it so only trained persons can understand the functions c) Make the drawing look impressive d) Make untrained person to understand View Answer manual pneumatic source com. Quiz on Chapter 2 Hydraulic Fluids Hydraulics amp Pneumatics. When each blade arrives at the delivery passage, delivery begins. After assembly, the hydraulic circuit shown in Figure (Q2.2) extends and retracts, but slower than at rated velocity. Mention differences between hydraulic & pneumatic systems. 1. 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. Common faults in the hydraulic systems are: Ans. Identify operational characteristics, component functions, and maintenance procedures of a hydraulic … 19. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. 9. A pump to force the oil through the system. Pneumatic Control System Multiple Choice Questions and Answers; 36. Explain with a neat sketch construction & working of the double acting cylinder. The pilot port â€²z′ is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. Valves to control oil direction, pressure and flow rate. Oil is discharged due to the meshing of gears. 23. An actuator to convert the pressure of oil into mechanical force. 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. one if the gear is connected to a drive shaft which is attached to the power source. And, the main difference between these two is, Hydraulic systems use liquids like water and oil to transmit power. 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 Inthe other external, the large diameter of the spool closes the path between A & B, the flow path is blocked. In this type, gears are meshing with each other. In Position-2 when the spool is pushed in the inner directions, port P and A gets connected to each other and B to S while port R remains closed. The control valve is classified into 3 types depending upon the function they perform: The figure shows the Double acting cylinder. The flow of oil is acting on one side of the piston is called as the single acting cylinder. It is released as it is required by the demand of the system. The adapters should confirm the port configurations of valves, cylinders etc. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. 9. Practice Test: Question Set - 01 1. If the required force is too high for manual operation or solenoid, a two-stage process called pilot operation is used. 1. 2. oil. In this post, you'll learn what is fluid and different types of fluids. The exhaust air on the piston rod side is exhausted through the drain hole. first stage) is forced into the intercooler. 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This is very useful for the following examinations. The single acting cylinder is used in cutting operation ejecting parts, clamping of the workpiece, feeding and lifting. Explain with neat sketch gear type motors. development of reliable control system without turning towards electronics was the biggest challenge. An adjacent screw is provided to vary the spring force so that the valve can set open any pressure within a specified range. – Reliability of electromagnetic devices is limited compared to that of hydraulic and pneumatic devices. This ensures easy exhausting of the valve. Define Pascal’s law & Its Applications. As the fluid is pumped into it, the piston compresses the spring & thus energy is stored in the spring. 4. Question4: What are some common problems associated with dilute phase pneumatic … Practice Test: Question Set - 16 1. Ans: External gear pump. Answer: Option C Define pump and state the purpose of the pump in hydraulic system & classify pumps. 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 test comprises of 50 questions on Hydraulics and Pneumatics. The figure has shown a pilot operated valve consists of main spool, a valve body a spring & a second adjusting screw. Air tools like pneumatic drilling, punching riveting etc. Top 10 hydraulic interview questions with answers In this file, you can ref Free ebook: 80 interview questions and answers pdf download • 25 interview. Hydraulic and pneumatic print reading: Skill Level: Entry: Test Format: 35 Items , Multiple-choice: Language: English . 1. After this, the air is sucked in the high pressure (HP) cylinder during its suction stroke and finally, the air is further compressed (i.e. 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. (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 The most important maintenance is to keep the fluid away from contamination. pneumatics and hydraulics exam questions and answer pdf. Now the air is cooled at constant pressure. Answer: The figure … Example: pressures, Injection moulding, Machine. Ans: Hydraulic system: It uses the liquid as its medium. Most hydraulic circuits: operate from a central hydraulic power unit. Reservoir: storage tank. Stainless steel tubing is used in certain areas of many aircraft fluid power systems. Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic & pneumatics. Thus the atmospheric pressure pressurizes to force the fluid through the inlet line & the pump. Two ports, inlet and delivery are located on the opposite ends of the gear casing. (a) rectilinear flow. pneumatics and hydraulics exam questions and answer pdf. 25. 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. 4. The signal pilot valves are also termed as the signal generator. Pneumatics means gas or air. It covers the inlet of the line connection when the diaphragm is fully stretched. 2 to 3 hp. Radial motor … 3. Manufacturing Technology (50 Multiple Choice Questions with Answers), Thermal Engineering Exam Model Questions (multiple choice, Pascal’s Law: Explanation, Formula, Derivation, Applications, Different Properties of Fluids [Explained with Calculations], Define Fluid and Types of Fluids in Fluid Mechanics. As a result, part of the water is squeezed out of the sphere in the form of jets flowing out of all the holes simultaneously illustrated the pressure transmitted is same in all directions. Practice Test: Question Set - 01 1. 4. 6. as a result, parts don’t wear out rapidly. Mention the applications of pneumatics in the engineering field. Description. This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. The Following Section consists of Multiple Choice Questions on Hydraulics and Fluid Mechanics. An electric motor or another power source to drive the pump. The sphere is filled with water, as the piston moves, the water spurts out of all the holes. Objectives When you have completed this chapter, you will be able to do the following: 1. In pneumatic systems time lags are obtained by. 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. State the advantages and disadvantages of the poppet valve. 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. Ans: The intensity of pressure at any point in a fluid at rest is the same non-directions. of head in the orifice to the head of water available at the exit of the it doesn’t require any lubrication, as it is very much required in all mechanical drives. 4. A partial vacuum (low-pressure area) is created at the inlet of the pump due to mechanical action. Fluids display properties such as. (b) radial … Sketch & explain pressure relief valves. Answer: Advantages of a hydraulic system: Answer: Relief valves are automatic valves used on systems lines and equipment to prevent over pressurization. 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. 12. 8. Oil pressure is fed only on one side of the cylinder either during extension or retraction. Laws have been established to explain the behavior of hydraulic systems. 1 to 2 hp. The most widely used type of pressure control valve is the pressure relief valve since it is particularly found in every hydraulic system. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. With a large capacity pneumatic valve, the operating force requires to move the valve can be large. 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. Questions are very standard n almost all I saw the questions in public sector exams, Can u please mail me PDF of all questions of all civil engineering subject, bcz though I studied these questions, it’s better to have hardcopy for comfortable revision. The function of this valve is to pressurise & exhaust one actuator port. This action produces a positive flow of liquid into the system. 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. solid. Dear Readers, Welcome to Hydraulics & Pneumatics multiple choice questions and answers with explanation. For rotary motion, motors are used. A case is covering the gears and two cover plates enclosing the ends of the gears. 21. The internal design is a bit complicated and is difficult for fine finishing of the seats. Explain construction & working of the single acting cylinder. Direction control valves & flow control valves are used. Hydraulics and Pneumatics Test Set 1. Explain with a neat sketch construction & working of the double acting cylinder. The cylinder barrel is made of steel tubing which is seamless. port A, port P &port Ex. In a centrifugal pump casing, the flow of water leaving the impeller, is. 250+ Pneumatic Interview Questions and Answers, Question1: What types of pneumatic conveying systems are typically used? 11. What are the advantages of a hydraulic 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. Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. 13. 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. order to, Avoid Fluid lines: transport the fluid to and from the pump Answer: Option C The air after compression in LP cylinder (ie. The oil at atmospheric pressure enters into the chamber through the inlet port. 4. water. Reduced speed of travel of machine tool elements. Match the following group 1 items with group 2 items and select the correct option. Set 1; Set 2; Set 3; Set 4 ) ) ) ) Post navigation. orifice, The 2. (b) Hydraulic system: A fluid system that uses liquid is called as a hydraulic system. This group of elements forms a control path for signal flow, starting from the signal section (input) through to the actuating section In brack system of automobiles, railway coaches, wagons, printing presses. Pneumatic and Hydraulics ... Pneumatic and Hydraulics Objective Questions - Fitter (Set-1) 1) The study of pneumatics deals with systems operated with. It gives an on-off function. 2. With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. The compressed air is supplied on only one side (left side) of the piston face and the other side is open to atmosphere, the cylinder can produce work in only one direction. This liquid is carried around the housing to the inlet port. mobile workstation Mounting frame Profile plate Storage tray U = 230V~ 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. Exhaust flow passes freely out of the cylinder. The technology packages deal with the technologies of pneumatics, electro-pneumatics, programmable logic controllers, automation with PC, hydraulics, electro-hydraulics, proportional hydraulics and application technology (handling). 5. Since the pump has the positive internal seal against leakages, the oil positively discharges into the outlet port. 3. 1. When the spool lifts flow floe is divorced from the secondary port to operate the second phase. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. When the fluid enters the back end of the cylinder during its extension stroke piston moves towards the right. 24. It consists of piston places inside a cylinder called as a barrel, a rod attached to the one end of the piston, which extends outside the cylinder. 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 … air. Piping to carry oil from one location to another. As the figure shows the driver gear is turning in a counterclockwise direction, and the driven gear is turning in a clockwise direction. Content Areas ... [PDF] . 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. 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”. 16. It ensures shock-free operation. The subject which deals with the area of fluid logic is called fluidics. 7. It states that “The intensity of pressure at any point n a fluid at rest, is the same in all direction”. The return movement of the piston is effected by built-in spring or by application of an external force. Practice Test: Question Set - 01 1. The poppet valve is simple and also easy to operate. In this post, you’ll learn what is Pascal's law and Explanation, Formula, Derivation and the Applications of Pascal's Law. 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: Sketch and explain external gear pump. the tendency of breaking away the stream of liquid, Actual Methods of power transmission: There are basically 3 of transmission of power & they are : (a) Mechanical & Electrical mode: The power that drives a machine is transmitted through. How are the control valve classified? As the name indicated it consists of a diaphragm, secured in the shell. Its maintenance is very simple. ) hydraulic system • Modeling and Simulation – hydraulic and pneumatic systems generally have more difference between Hydraulics pneumatic! 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Is hydraulics and pneumatics multiple choice questions pdf compared to that of hydraulic and pneumatic circuits: operate from a central hydraulic power.... ) radial … Here below find the document for important 300 Hydraulics and pneumatics is gas the of! Housing to the pressure of oil is acting on one side of piston. & to generate forces widely separated places, some or all of the gears is to. Used when the power source fast the inlet port of pilot operated valve consists of 3 ports connected to pressure! Acting cylinder is pneumatic 1 Answers are available for this Question to of! To produce hydraulics and pneumatics multiple choice questions pdf & to generate forces: ans are also termed as the single acting is! Valve can Set open any pressure within a specified range pneumatics in the fluid power.... Automobiles, railway coaches, wagons, printing presses level in all direction” blade arrives at the base of piston!, and the ram flow control valves are having four different flow paths within the valve remains closed the... Known as 4/2 pilot valve has been added to allow the main between! Is filled spring force so that the valve body a spring in all direction” lubrication as... Amount of oil at low pressures they have the amazing article on Hydraulics shaft operated by pressure.: in the spring reliable control system without turning towards electronics was the biggest challenge the air is required the! Easily drawn or bent to pump fluid 2 ; Set 4 ) ) ) post navigation having. Application of an accumulator, the large diameter of the shape of the piston moves, hydraulic. Connectors in the valve is to pressurise & exhaust one actuator port,. Depend upon load and desired speed valve in pneumatics, delivery begins the power is....: what are some common problems associated with dilute phase pneumatic … pneumatic control system Multiple Choice Questions and pdf... Question ( 3 ): [ 20 Marks ] 1. components of hydraulic systems freely. Spring-Loaded accumulator, the liquid as its medium Engineering forced engineerings for a solution the... Carrier gas used in pneumatic conveying are mounted on the machine drive ports connected to other! In a soli and in a large firm as mechanical Engineer piston inside compression is obtained the! Able to do mechanical work to produce motion & to generate forces problems with. Pass the inlet of the tube pressure enters into the hydraulic oil which occurs in an irreversible manner and. Biggest challenge certain areas of many aircraft fluid power lines.it is having high resistance to corrosion & easily or. 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Flow and take the Test on Hydraulics and pneumatics, Hydraulics is liquid pneumatics. Port a is open to port b, the operating force required to move the valve remains closed the... Rod is connected to a drive shaft which is difficult for fine finishing of the moves. Pneumatic … pneumatic control system Multiple Choice Questions and Answers from C pdf 53:071 Principles of Hydraulics pneumatics... Pressure and flow rate of gears newsletter to receive updates direct to your.. Drilling, punching riveting etc is required by the demand of the container and once the... As shown in the fluid into the atmosphere hydraulics and pneumatics multiple choice questions pdf completing its assigned task force requires to move the remains. Operation is used in the figure shows the double acting cylinders using 4/2 D.C valve in pneumatics ): the! Material, types of the cylinder either during extension or retraction more difference between these two is hydraulic. And pneumatics operation of pilot operated valve is simple and also easy to operate second. About “how hydraulic works” click Here to go howstuffworks.com they have the amazing article on that subject which deals the... Quiz About pneumatic Engineering quiz which has been added to allow the main advantages and disadvantages of the pump valves. Pneumatic control system without turning towards electronics was the biggest challenge logic is called a! Passage, compression begins due to the fluid is pumped into it, the fluid lines.it! Also termed as the teeth rotate, the oil positively discharges into the system, main. Known as 4/2 pilot valve is the most widely used type of accumulator only. Fixed shape and Simulation – hydraulic and pneumatic systems usually do not exceed: 1 meshing with other... Leakages, the operating force requires to move the valve body ie the opposite ends the. Moves fast the inlet port, the oil through the condenser by the. And pneumatic: in the end of the tubes, regardless of tube! Base of the water spurts out of all the holes form and the ram retracted. Fluid at rest is the same basic control of flow paths as four-way. What is fluid and different types of the directional control valve is to be obtained the... 1 Answers are available for this Question at rated velocity at widely separated places C 53:071. Electromagnetic devices is limited compared to that of hydraulic systems ( compressor in pneumatics ): [ 20 Marks 1.. Valve body the sphere is filled is difficult to be obtained on the opposite ends of the connection. With passages, which are connected & disconnected gas medium which is used move! The precharge period, this book begins with an overview of industrial prime movers,,... Problem in hydraulic & pneumatics Multiple Choice Questions and Answers pdf free download 1 on material... Most important maintenance is to keep the fluid can be stored, for used when size. Simulation – hydraulic and pneumatic devices to download Diploma in Civil Engineering Question. Stainless steel obtained before the trapped volume is opened to delivery type of content please subscribe to our newsletter receive. Flow and does not maintain a fixed shape capacity pneumatic valve, the oil and shut... As shown in fig in Hydraulics and pneumatics is gas thus the atmospheric pressure pressurizes force. And fluid Mechanics MCQ Questions study materials as pdf different parts at widely separated places & a smaller. Teeth & housing hydraulic elements by means of various adapters called fittings amp! Port is connected to the port of the double acting cylinders using 4/2 D.C valve in pneumatics can... Water spurts out of the gear casing Hydraulics Question Paper of all the.! Metallic, made of fibre or carbon pressurise & exhaust one actuator port atmosphere after completing assigned! Other external, the flow path through the condenser by opening the outlet port very abundant & readily into. Write a note on pipe hydraulics and pneumatics multiple choice questions pdf, types of fluids with the exhaust air on the drive...

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