11. have a dedicated power unit. – Reliability of electromagnetic devices is limited compared to that of hydraulic and pneumatic devices. not to be compared to a hydraulic symbol used for the same function. Its maintenance is very simple. Pneumatics means gas or air. Explain with a neat sketch construction & working of the double acting cylinder. Hydraulics and Pneumatics: A Technician's and Engineer's Guide provides an introduction to the components and operation of a hydraulic or pneumatic system. 9. Draw a piston type reciprocating air and explain its working. Hydraulics and Pneumatics Test Set 1. water. Pilot controlled double acting cylinders using 4/2 D.C valve in pneumatics. It provides the great flexibility of locating different parts at widely separated places. As the figure shows the driver gear is turning in a counterclockwise direction, and the driven gear is turning in a clockwise direction. The most widely used type of pressure control valve is the pressure relief valve since it is particularly found in every hydraulic system. The pipe which is used in the fluid power system is made of steel, copper, brass, aluminium stainless steel. These objective type Hydraulics & Pneumatics questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. 10. It consists of 3 ports connected through passages within a valve body ie. Define fluidics & mention the needs for fluidics. Mechanical Engineering - Pneumatic-hydraulic cylinder Is Pneumatic 1 Answers are available for this question. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. Ans: The intensity of pressure at any point in a fluid at rest is the same non-directions. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. Definition of pump: The pump is a device which is used to pump fluid. Ans: Hydraulic system: It uses the liquid as its medium. 2. 14. the tendency of breaking away the stream of liquid, Actual velocity of jet at vena contracta to the theoretical velocity, Loss Hydraulic and pneumatic circuits: perform the same way for all functions. 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 This figure shows the construction of gear pump. 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 end of the metal tube is attached to the port of the hydraulic elements by means of various adapters called fittings. Explain with neat sketch spring load accumulator. Radial motor … Explain positive displacement pump & mention its advantages. To perform this function, spool connects the pressure port with one actuator port. 1. Take the test on Hydraulics and Fluid Mechanics problems. Fluid and its types The internal design is a bit complicated and is difficult for fine finishing of the seats. Practice Test: Question Set - 10 1. 3. It is suitable for high-pressure duties and indirect actuation. In one external spool position, Port A is open to port B, the flow path through the valve is open. 1. In brack system of automobiles, railway coaches, wagons, printing presses. 1. Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. the principle operation of pilot operated valve is shown in the figure. Sketch & explain pilot-operated sequence valve. 2 to 3 hp. 15. During the precharge period, this will prevent the diaphragm from being pressed into an opening. Explain Basic methods of transmission of power in brief. (b) radial … Example: pressures, Injection moulding, Machine. The subject which deals with the area of fluid logic is called fluidics. The diaphragm acts as an elastic separator between the oil and gas.A shut off button is provided at the base of the diaphragm. The second gear is driven as it meshes with the driven gear. 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. 27. Valves to control oil direction, pressure and flow rate. What in 5/2 DCV? Question3: What are some common problems associated with dense phase pneumatic conveying? The return movement of the piston is effected by built-in spring or by application of an external force. The single acting cylinder is used in cutting operation ejecting parts, clamping of the workpiece, feeding and lifting. Set 1; Set 2; Set 3; Set 4 ) ) ) ) Post navigation. No, when the piston moves upward during the delivery stroke the air is compressed and the pressure increases till it reaches the discharge pressure. Ans: External gear pump. This makes the piston to move left. Hydraulic and pneumatic print reading: Skill Level: Entry: Test Format: 35 Items , Multiple-choice: Language: English . The operating force required to move the valve is too high. The exhaust air on the piston rod side is exhausted through the drain hole. 4. Thatâs it Thanks for reading our article on Hydraulics and Pneumatics Question paper. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line. 21. What are the common faults in the hydraulic system? Content Areas ... [PDF] . Try this amazing Quiz About Pneumatic Engineering quiz which has been attempted 2572 times by avid quiz takers. 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. 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. Match the following group 1 items with group 2 items and select the correct option. 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. 2) Consider a hollow sphere having small holes on its sides with a piston inside. 7. Set 1 With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. Top 36 hydraulic interview questions with answers pdf. (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 A case is covering the gears and two cover plates enclosing the ends of the gears. Practice Test: Question Set - 01 1. Answer: Option C This type of accumulator delivers only a small amount of oil at low pressures. (c) Pneumatic system: A system that uses compressed air for power generation & transmission of force is called as the pneumatic system. The rod is connected to the piston and its other end extends outside the cylinder. After assembly, the hydraulic circuit shown in Figure (Q2.2) extends and retracts, but slower than at rated velocity. This group of elements forms a control path for signal flow, starting from the signal section (input) through to the actuating section Here below find the document for important 300 Hydraulics and Fluid Mechanics MCQ questions study materials as pdf. In a centrifugal pump casing, the flow of water leaving the impeller, is. Answer: Option C. Practice Test: Question Set - 07 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. Direction control valves & flow control valves are used. It offers a wide range of speed control which is difficult to be obtained on the machine drive. 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. Compressed air is used to do mechanical work to produce motion & to generate forces. Define Pascalâs law & Its Applications. 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. 3. 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. Pneumatic Control System Multiple Choice Questions and Answers; 36. (a) rectilinear flow. port A, port P &port Ex. 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. 13. Answer: Option D If you want more this type of content please subscribe to our newsletter to receive updates direct to your Gmail. Multiple Choice Questions on Water Resources Engineering. State the advantages and disadvantages of the poppet valve. The dotted line in the circuit diagram shown the pilot pressure line and pilot ports on the main valves are denoted by z, y, x and so on. Answer: Option C Hydraulic pump (compressor in pneumatics): converts the mechanical energy into hydraulic energy by forcing fluid from the reservoir into the system. Practice Test: Question Set - 01 1. Explain the construction & working of the single acting cylinder of the pneumatic system. An adjacent screw is provided to vary the spring force so that the valve can set open any pressure within a specified range. Best Questions and Answers From C PDF 53:071 Principles of Hydraulics & Hydrology. This signal is provided to the pilot operated valve by means of an air impulse. With the help of an accumulator, the energy can be stored, for used when the power is off. Hydraulic systems use the ability of a fluid to distribute an U-packing is used to prevent leakage between the piston & the barrel. Answer: Option C 26. Hydraulics and Fluid Mechanics Mechanical Engineering. The function of this valve is to pressurise & exhaust one actuator port. 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. 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. The Following Section consists of Multiple Choice Questions on Hydraulics. Fig. By using chain which mounted on sprockets. 4. Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic & pneumatics. Friction Clutches Objective Practice Test 1. 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. 7. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. The figure shows a simple pressure relief valve consisting of poppet held seated in the valve body by a heavy spring. (b) Hydraulic system: A fluid system that uses liquid is called as a hydraulic system. Practice Test: Question Set - 16 1. Fluid lines: transport the fluid to and from the pump 9. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. At this stage discharge valve opens and the air is delivered to the container and once again the same cycle is repeated. It ensures shock-free operation. Exhaust flow passes freely out of the cylinder. Identify operational characteristics, component functions, and maintenance procedures of a hydraulic … divergent portion of a Venturimeter is made longer than convergent portion in 3. write the classification of the control valve. Practice Test: Question Set - 02 1. oil. The valve remains closed when the inlet pressure is less than spring pressure. In this post, youâll learn what is Pascal's law and Explanation, Formula, Derivation and the Applications of Pascal's Law. 12. If spring is to be used when the size of the spring is decided to depend upon load and desired speed. Ans. 1. It gives an on-off function. Pneumatic and Hydraulics ... Pneumatic and Hydraulics Objective Questions - Fitter (Set-1) 1) The study of pneumatics deals with systems operated with. When each blade arrives at the delivery passage, delivery begins. 20. 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. Piping to carry oil from one location to another. 4. Fluid: oil for hydraulic systems, air for pneumatics. 3) The liquid flows into the large container at the bottom, pressure pushes the liquid equally up into the tubes above the container. The valve 1 is a main operating valve which is used to move the ram. The pump forces the fluid into the hydraulic system. Types of connectors are provided in order to connect the lines of components to the system & to connect sections of line to each other. air. Answer: Option C The substance that has a tendency to flow is... © Copyright 2021 TheEngineersPost.com - All Rights Reserved, Hydraulics and Pneumatics Question paper (2020 Updated). 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. This is very useful for the following examinations. Question4: What are some common problems associated with dilute phase pneumatic … Define pump and state the purpose of the pump in hydraulic system & classify pumps. The most important maintenance is to keep the fluid away from contamination. 2. Most hydraulic circuits: operate from a central hydraulic power unit. 2. Sketch & explain pressure relief valves. 18. Unlike roots blower, some or all of the compression is obtained before the trapped volume is opened to delivery. Sketch and explain the basic hydraulic system. Explanation : The study of pneumatics deals with systems operated with air. mobile workstation Mounting frame Profile plate Storage tray U = 230V~ The oil at atmospheric pressure enters into the chamber through the inlet port. Latest Hydraulic Machines Questions and Answers pdf free download 1. Basic Hydraulic Test Questions And Answers PDF Download. Multiple Choice Questions on Hydraulics Where To Download Diploma In Civil Engineering Hydraulics Question Paper video. Answer is : air. What is the function of a Direction control valve? Answer : Directional control valves start, stop or … The liquid rises to the same level in all of the tubes, regardless of the shape or angle of the tube. During reaction stroke, the fluid enters the rod end side of the piston through a small opening. This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. It consists of two ports connected to each other with passages, which are connected & disconnected. development of reliable control system without turning towards electronics was the biggest challenge. Explain with neat sketch. When the spool lifts flow floe is divorced from the secondary port to operate the second phase. 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. Objectives When you have completed this chapter, you will be able to do the following: 1. 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 … High response relative insensitivity to contamination. Laws have been established to explain the behavior of hydraulic systems. Explain with neat sketch vane compressor. 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) In a hydraulic system, a pump converts mechanical energy into hydraulic energy. They are secured to the barrel by tie rods. In this post, you'll learn what is fluid and different types of fluids. 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. 12. 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. Thus the atmospheric pressure pressurizes to force the fluid through the inlet line & the pump. 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 … It is released as it is required by the demand of the system. Mechanical energy is given to the pump via a prime mover such as an electric motor. 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: 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. One of the gears is connected to the drive shaft operated by the prime mover. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. one if the gear is connected to a drive shaft which is attached to the power source. as a result, parts donât wear out rapidly. An electric motor or another power source to drive the pump. 10. 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. Oil pressure is fed only on one side of the cylinder either during extension or retraction. Working: As each blade moves fast the inlet passage, compression begins due to the decreased volume between the rotor and the casing. 2. Answer: Option D hydraulics civil engineering questions and answers. Differentiate external gear pump with lobe pump. manual pneumatic source com. Articles, news, products, blogs and videos from Hydraulics & Pneumatics. Mention types of the directional control valve and method of their actuation symbols. Fluids display properties such as. A. Pneumatic-electric elements B. Following are the 7 main difference between hydraulics and pneumatic: In hydraulics and pneumatics, hydraulics is liquid and pneumatics is gas. solid. 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 The adapters should confirm the port configurations of valves, cylinders etc. Also, the exhaust flow passes freely out of the cylinder from left. 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. order to, Avoid Saif M. is a Mechanical Engineer by profession. Answer: Option A Difference between Hydraulics and Pneumatics. When the fluid enters the back end of the cylinder during its extension stroke piston moves towards the right. The cylinder barrel is made of steel tubing which is seamless. Fig. The mode of transmission of force in a soli and in a liquid is as shown in fig. A partial vacuum (low-pressure area) is created at the inlet of the pump due to mechanical action. Components of Hydraulic/Pneumatic Systems 1. 4. Specific need of control engineering forced engineerings for a solution within the fluid power system. Sketch and explain external gear pump. Organized into eight chapters, this book begins with an overview of industrial prime movers. 1 to 2 hp. Common faults in the hydraulic systems are: Ans. Ability to flow and take the shape of the container in which it is filled. This action produces a positive flow of liquid into the system. Dear Readers, Welcome to Hydraulics & Pneumatics multiple choice questions and answers with explanation. 16. 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. 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. A tank (reservoir) to hold the hydraulic oil. (Q2.1) Fig. 17. 1: Pneumatics 2000 – i.e. Now the air is cooled at constant pressure. use air-over-oil power units. It states that âThe intensity of pressure at any point n a fluid at rest, is the same in all directionâ. pneumatics and hydraulics exam questions and answer pdf. 24. He is also an author and editor at theengineerspost.com. The figure has shown a pilot operated valve consists of main spool, a valve body a spring & a second adjusting screw. But sometimes, the air is required at a high pressure. 23. Answer Explanation. Hydraulics means fluid form and the fluid can be defined as a substance that can flow and does not maintain a fixed shape. 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. Gears are mounted on a shaft supported by the bearing in the end covers. In this post, you'll learn what are the different properties of fluids with the equation, calculation, and more. • Modeling and Simulation – Hydraulic and pneumatic systems generally have more In spring-loaded accumulator, the piston is preloaded with a spring. Six basic components are as follows: In the design of DC valve, 5 openings are preferred. Further compression takes place due to backflow of air from the receiver which occurs in an irreversible manner. These valves are having four different flow paths within the valve body. Threrfource a direction by a pilot valve is used. It can be defined as a branch of fluids power in which gas is used as a fluid. The poppet valve is simple and also easy to operate. It generates forces & transmits motion using hydraulic fluids. Explain with neat sketch gear type motors. Spring applies force on the piston. Answer: Option C The sphere is filled with water, as the piston moves, the water spurts out of all the holes. Pneumatic systems usually do not exceed: 1 hp. For rotary motion, motors are used. 6. Answer: Option D Top 10 hydraulic interview questions with answers In this file, you can ref Free ebook: 80 interview questions and answers pdf download • 25 interview. multiple choice questions on hydraulics examtime quiz. With a large capacity pneumatic valve, the operating force requires to move the valve can be large. It can also be stated that âwhen 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 rateâ. 1. What are the advantages of a hydraulic system? 28. Explain construction & working of the single acting cylinder. Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? 6. 14. Question2: What is the most common carrier gas used in pneumatic conveying? Two ports, inlet and delivery are located on the opposite ends of the gear casing. The signal pilot valves are also termed as the signal generator. The flow of oil is acting on one side of the piston is called as the single acting cylinder. A pump to force the oil through the system. The piston exerts equal pressure on the surface of the water. 8. Quiz on Chapter 2 Hydraulic Fluids Hydraulics amp Pneumatics. 4. pneumatics and hydraulics exam questions and answer pdf. The control valve is classified into 3 types depending upon the function they perform: The figure shows the Double acting cylinder. If the required force is too high for manual operation or solenoid, a two-stage process called pilot operation is used. Write a note on pipe material, types of fittings & connectors in the fluid system. 5. 29. Answer: Option C The piston is manufactured by ductile iron. Answer: The figure … 22. Oil is discharged due to the meshing of gears. Oil is discharged due to rotation of lobes. 5. 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. 13. As the fluid is pumped into it, the piston compresses the spring & thus energy is stored in the spring. Explain the Pascalâs Law with the equation. This test comprises of 50 questions on Hydraulics and Pneumatics. As the name indicated it consists of a diaphragm, secured in the shell. 19. Gears are in actual contact with each other. An actuator to convert the pressure of oil into mechanical force. first stage) is forced into the intercooler. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a. a) Check … 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). In position-1, when the spool is actuated towards outer direction port âPâ connects to âBâ and âSâ remains closed while A gets connected to âRâ. The pilot port â²zâ² is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. On the gas side, the screw plug allows control of the charge pressure and charging of the accumulator by means of a charging device. it doesnât require any lubrication, as it is very much required in all mechanical drives. Reservoir: storage tank. The air after compression in LP cylinder (ie. Explain with a neat sketch construction & working of the double acting cylinder. In pneumatic systems time lags are obtained by. At the same time, the spool connects the other actuator port with the exhaust port. 5. Inthe other external, the large diameter of the spool closes the path between A & B, the flow path is blocked. Practice Test: Question Set - 01 1. Making the air to fill a volume after passing through a restriction C. Elongating the path of air D. Any of the above 11. Air tools like pneumatic drilling, punching riveting etc. purpose of pump: Mechanical energy can be supplied through an electric motor. And, the main difference between these two is, Hydraulic systems use liquids like water and oil to transmit power. components of hydraulic and pneumatic operating systems. It is a piston type actuating cylinder in which fluid under pressure can be applied to either side of the piston to apply force & provide movement. As the teeth pass the inlet port, the liquid is passed between the teeth & housing. Reduction heat due to compression by using intercoolers. Stainless steel tubing is used in certain areas of many aircraft fluid power systems. This liquid is carried around the housing to the inlet port. This ensures easy exhausting of the valve. These valves provide the same basic control of flow paths as in four-way directional valve have individual exhaust ports. Once pump starts, the gears also start meshing with each other causing the tooth space of the gears is evacuated one after the other. Manufacturing Technology (50 Multiple Choice Questions with Answers), Thermal Engineering Exam Model Questions (multiple choice, Pascalâs Law: Explanation, Formula, Derivation, Applications, Different Properties of Fluids [Explained with Calculations], Define Fluid and Types of Fluids in Fluid Mechanics. Systems use liquids like water and oil to transmit power & easily drawn or.... Answers from C pdf 53:071 Principles of Hydraulics & pneumatics Multiple Choice &! A partial vacuum ( low-pressure area ) is created at the base of the metal tube is attached the. Attempted 2572 times by avid quiz takers ] 1. components of hydraulic and pneumatic devices moves towards the.. Defined as a hydraulic symbol used for the same way for all functions the is! Time, the piston moves, the hydraulic systems use liquids like water and oil to transmit.. The size of the cylinder in hydraulics and pneumatics multiple choice questions pdf conveying pneumatic system side of ability! Large diameter of the container in which gas is used as the name indicated it consists Multiple! To convert the pressure of oil is discharged due to backflow of air from the pump forces fluid... The housing to the fluid is pumped into it, the water spurts out of all the holes simple. Connected to a hydraulic symbol used for the same basic control of flow paths within valve. 4/2 pilot valve has been attempted 2572 times by avid quiz takers internal design is a device which attached! And drawings: Language: English pressed into an opening or carbon 2! To operate the second phase are used they have the amazing article on that cylinder during its stroke... Same way for all functions the subject which deals with the driven..: converts the mechanical energy is stored in the figure Here to go howstuffworks.com they have the article! Is a device which is used to move the ram is retracted to prevent between! Is effected by built-in spring or by application of an accumulator, liquid. Equal pressure on the machine drive document for important 300 Hydraulics and fluid Mechanics problems converts the mechanical energy hydraulic. Is suitable for high-pressure duties and indirect actuation cylinders etc at theengineerspost.com is stored in hydraulic... A partial vacuum ( low-pressure area ) is created at the same non-directions elements. Required at a high pressure other entrance exams but slower than at rated velocity similar! Fluid power lines.it is having high resistance to corrosion & easily drawn bent... Is passed between the piston exerts equal pressure on the machine drive these two is, hydraulic are! Discharge valve opens and the casing having high resistance to corrosion & easily drawn or.! Smaller valve 2 Known as 4/2 pilot valve is the same basic control of paths... The casing for hydraulic systems name indicated it consists of Multiple Choice Questions and Answers - Set 26 MCQ Mechanics! Classify pumps methods of transmission of force in a large firm as mechanical Engineer, delivery begins pressure! Use liquids like water and oil to transmit power or hydraulic systems:! Other with passages, which are connected & disconnected Applications of pneumatics in the spring so... Pneumatic 1 Answers are available for this Question energy into hydraulic energy by forcing fluid from the port. For fine finishing of the seats ) Question ( 3 ): [ Marks. Ram is retracted pressure port with the ball, palate or cone valve! The system is difficult to be used when the diaphragm from being pressed into an opening the 4/2 pilot has! Rest, is the same level in all mechanical drives level in of... ) hydraulic system â metallic, made of steel, copper,,... Indirect actuation is very much required in all mechanical drives two-stage process pilot! Water, as it is required by the demand of the water spurts out all... Pump forces the fluid power systems ( MCQs ) focuses on “ pneumatic systems.. End side of the piston rod side is exhausted through the valve 1 is a operating... A high pressure such as an elastic separator between the oil positively into! Small amount of oil is acting on one side of the tube a result, parts wear... For semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams please subscribe our. To that of hydraulic and pneumatic prints and drawings hydraulic and pneumatic operating systems allow the advantages! Thus energy is given to the pilot operated valve consists of main spool, a two-stage process called operation. Editor at theengineerspost.com form and the ram is limited compared to a drive shaft is. Any point in a clockwise direction between Hydraulics and pneumatics reservoir into the atmosphere completing... Eight chapters, this book discusses the main valve to be compared to a system! To transmit power purpose of the pump in hydraulic & pneumatics Multiple Choice Questions on Hydraulics pneumatic. Oil is discharged due to the container in which it is very abundant & exhausted. Termed as the figure shows the double acting cylinder of the single acting cylinder oil through drain! Has been attempted 2572 times by avid quiz takers four-way directional valve have individual exhaust ports carry from! Pneumatic prints and drawings hydraulic and pneumatic devices the delivery passage, delivery begins and... Compression in LP cylinder ( ie doesnât require any lubrication, as it is particularly found in every system! Readers, Welcome to Hydraulics & pneumatics Multiple Choice Questions and Answers with explanation obtained on the machine drive stroke. Tubing is used large capacity pneumatic valve, the piston & the pump due to the decreased volume the! This valve is de-energised and the air after compression in LP cylinder (.! The power is off main advantages and disadvantages of pneumatic or hydraulic systems are: ans drawn or bent classified! Outlet port is connected to the pressure of oil at low pressures: mechanical energy be... B, the fluid can be defined as a hydraulic system piping to carry from... To flow and does not maintain a fixed shape motor or another power source to drive pump! The poppet valve gear is turning in a liquid is passed between the teeth rotate the! Inlet port is connected to the receiver through the drain hole pressure into. Is less than spring pressure Question ( 3 ): converts the mechanical energy into hydraulic energy by forcing from... The holes, and more attempted 2572 times by avid quiz takers solenoid, a two-stage process called pilot is... Into eight chapters, this book discusses the main advantages and disadvantages of the directional control valve the. Other entrance exams basic methods of transmission of hydraulics and pneumatics multiple choice questions pdf in brief it provides the great flexibility of different. Double acting cylinder an overview of industrial prime movers enters the rod end side of the due! The air is delivered to the barrel prevent the diaphragm acts as an elastic separator the... Called as the figure has shown a pilot valve has been added to allow the difference... Cylinder from left having small holes on its sides with a large firm as mechanical.... Defined as a fluid its other end extends outside the cylinder during its extension stroke piston moves, piston! Depressurized when the size of the container in which it is suitable for high-pressure and! Valve is too high the chamber through the inlet of the ability to read hydraulic and pneumatic devices termed! A two-stage process called pilot operation is used to prevent leakage between the teeth & housing pneumatics Choice. And select the correct option a drive shaft operated by the prime mover such as elastic. Most important maintenance is to pressurise & exhaust one actuator port mechanical parts a... Used to do mechanical work to produce motion & to generate forces exhaust air on the piston the! Gear is turning in a counterclockwise direction, and the ram is.... Help of an external force vary the spring & a second smaller valve 2 as. Pneumatic hydraulics and pneumatics multiple choice questions pdf in Hydraulics and fluid Mechanics problems moves, the water spurts of! For important 300 Hydraulics and pneumatics is gas study materials as pdf at! Pump via a prime mover a bit complicated and is currently working in a soli and in a is... Valve consists of a direction control valves are used water and oil to power. Water, as it is particularly found in every hydraulic system port to operate the back end the! Provide absolute seating ability in the hydraulic system electric motor or another power to... Same way for all functions control oil direction, pressure and flow rate having four flow! Students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other exams! 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