This group of elements forms a control path for signal flow, starting from the signal section (input) through to the actuating section 4. Answer: Option D One of the gears is connected to the drive shaft operated by the prime mover. 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. 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. 1. Radial motor … Ans: Hydraulic system: It uses the liquid as its medium. Pneumatic Control System Multiple Choice Questions and Answers; 36. Answer: The figure is shown a simple piston pump called a positive displacement or hydrostatic pump. By using chain which mounted on sprockets. oil. This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. 2. Answer: Advantages of a hydraulic system: Answer: Relief valves are automatic valves used on systems lines and equipment to prevent over pressurization. Hydraulics and Pneumatics: A Technician's and Engineer's Guide provides an introduction to the components and operation of a hydraulic or pneumatic system. Hydraulics and Pneumatics Test Set 1. Reservoir: storage tank. Understand the operating principles of hydraulic systems. The exhaust air on the piston rod side is exhausted through the drain hole. Next, the piston is driven up with the inlet valve closed and the outlet valve open, driving the same volume of fluid to the pump outlet. Answer: Option C Practice Test: Question Set - 02 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. Spring applies force on the piston. 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. Most hydraulic circuits: operate from a central hydraulic power unit. Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic & pneumatics. Mention differences between hydraulic & pneumatic systems. Explain with neat sketch gear type motors. The cylinder barrel is made of steel tubing which is seamless. Objectives When you have completed this chapter, you will be able to do the following: 1. Exhaust flow passes freely out of the cylinder. The figure shows a simple pressure relief valve consisting of poppet held seated in the valve body by a heavy spring. 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. These valves are having four different flow paths within the valve body. 6. 28. 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. 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. Set 1; Set 2; Set 3; Set 4 ) ) ) ) Post navigation. The second gear is driven as it meshes with the driven gear. Explain construction & working of the single acting cylinder. In pneumatic systems time lags are obtained by. 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) Quiz on Chapter 2 Hydraulic Fluids Hydraulics amp Pneumatics. Sketch and explain external gear pump. 9. It offers a wide range of speed control which is difficult to be obtained on the machine drive. After assembly, the hydraulic circuit shown in Figure (Q2.2) extends and retracts, but slower than at rated velocity. 13. Hydraulic pump (compressor in pneumatics): converts the mechanical energy into hydraulic energy by forcing fluid from the reservoir into the system. Content Areas ... [PDF] . 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. Answer: Option A write the classification of the control valve. The end of the metal tube is attached to the port of the hydraulic elements by means of various adapters called fittings. The Following Section consists of Multiple Choice Questions on Hydraulics. ATM 1112 – Basic Hydraulics and Pneumatics 8 Module 1: Introduction to pneumatics 4 Structure and signal flow of pneumatic systems Pneumatic systems consist of an interconnection of different groups of elements. Reduction heat due to compression by using intercoolers. When the spool lifts flow floe is divorced from the secondary port to operate the second phase. Identify operational characteristics, component functions, and maintenance procedures of a hydraulic … Organized into eight chapters, this book begins with an overview of industrial prime movers. Practice Test: Question Set - 01 1. 27. 4. Oil is discharged due to the meshing of gears. Also explore over 82 similar quizzes in this category. It is suitable for high-pressure duties and indirect actuation. It consists of 3 ports connected through passages within a valve body ie. Explain with a neat sketch construction & working of the double acting cylinder. Define Pascalâs law & Its Applications. Mention types of the directional control valve and method of their actuation symbols. Definition of pump: The pump is a device which is used to pump fluid. Sketch and explain the basic hydraulic system. Answer: Option C 10. Mechanical energy is given to the pump via a prime mover such as an electric motor. 21. In this post, youâll learn what is Pascal's law and Explanation, Formula, Derivation and the Applications of Pascal's Law. The pilot port â²zâ² is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. Types of connectors are provided in order to connect the lines of components to the system & to connect sections of line to 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 sphere is filled with water, as the piston moves, the water spurts out of all the holes. Multiple Choice Questions on Hydraulics Where To Download Diploma In Civil Engineering Hydraulics Question Paper video. Friction Clutches Objective Practice Test 1. The liquid rises to the same level in all of the tubes, regardless of the shape or angle of the tube. Practice Test: Question Set - 10 1. Explain with neat sketch vane compressor. For linear motion, cylinders are used. 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. 25. Stainless steel tubing is used in certain areas of many aircraft fluid power systems. Threrfource a direction by a pilot valve is used. the principle operation of pilot operated valve is shown in the figure. 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. With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. as a result, parts donât wear out rapidly. 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. 61 top hydraulic machines mechanical engineering. Multiple Choice Questions on Water Resources Engineering. port A, port P &port Ex. Hydraulics and Fluid Mechanics Mechanical Engineering. 1. Components of Hydraulic/Pneumatic Systems 1. 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. To learn more about âhow hydraulic worksâ click here to go howstuffworks.com they have the amazing article on that. it doesnât require any lubrication, as it is very much required in all mechanical drives. Practice Test: Question Set - 01 1. Write a note on pipe material, types of fittings & connectors in the fluid system. 14. It is released as it is required by the demand of the 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. The control valve is classified into 3 types depending upon the function they perform: The figure shows the Double acting cylinder. 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 … Saif M. is a Mechanical Engineer by profession. For rotary motion, motors are used. A case is covering the gears and two cover plates enclosing the ends of the gears. The valve remains closed when the inlet pressure is less than spring pressure. 1 to 2 hp. Common faults in the hydraulic systems are: Ans. As the teeth pass the inlet port, the liquid is passed between the teeth & housing. development of reliable control system without turning towards electronics was the biggest challenge. 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 Explain the construction and working of Diaphragm Accumulator. As the name indicated it consists of a diaphragm, secured in the shell. Piping to carry oil from one location to another. 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. Answer: Option A With a large capacity pneumatic valve, the operating force requires to move the valve can be large. Question4: What are some common problems associated with dilute phase pneumatic … Fluid and its types Answer Explanation. The internal design is a bit complicated and is difficult for fine finishing of the seats. 5. Types of the directional control valve (DCV) : Five ports are one pressure port, two actuator ports, & two exhaust port. The pneumatic system uses air as the gas medium which is very abundant & readily exhausted into the atmosphere after completing its assigned task. – Reliability of electromagnetic devices is limited compared to that of hydraulic and pneumatic devices. Difference between Hydraulics and Pneumatics. Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? The operating force required to move the valve is too high. Define fluidics & mention the needs for fluidics. Basic Hydraulic Test Questions And Answers PDF Download. Draw a piston type reciprocating air and explain its working. Answer: Option B 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. 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. 5. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. (c) Pneumatic system: A system that uses compressed air for power generation & transmission of force is called as the pneumatic system. A pump to force the oil through the system. not to be compared to a hydraulic symbol used for the same function. A pump converts mechanical energy into hydraulic energy. (a) rectilinear flow. 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. 17. 5. 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. Following are the 7 main difference between hydraulics and pneumatic: In hydraulics and pneumatics, hydraulics is liquid and pneumatics is gas. The diaphragm acts as an elastic separator between the oil and gas.A shut off button is provided at the base of the diaphragm. 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 Hydraulic Machines. At this stage discharge valve opens and the air is delivered to the container and once again the same cycle is repeated. 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. pneumatics and hydraulics exam questions and answer pdf. The function of this valve is to pressurise & exhaust one actuator port. Practice Test: Question Set - 01 1. 2. 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. orifice, The Further compression takes place due to backflow of air from the receiver which occurs in an irreversible manner. Answer: The figure … • Modeling and Simulation – Hydraulic and pneumatic systems generally have more 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). The figure has shown a pilot operated valve consists of main spool, a valve body a spring & a second adjusting screw. If spring is to be used when the size of the spring is decided to depend upon load and desired speed. As the figure shows the driver gear is turning in a counterclockwise direction, and the driven gear is turning in a clockwise direction. Pneumatic and Hydraulics ... Pneumatic and Hydraulics Objective Questions - Fitter (Set-1) 1) The study of pneumatics deals with systems operated with. 16. 2nd year Civil Diploma - Hydraulics - Chapter 2 to 8: Question Bank (part 1) Hydraulics is an important field in Civil Engineering that has to … 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: This action produces a positive flow of liquid into the system. Valves to control oil direction, pressure and flow rate. 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. Gears are in actual contact with each other. In spring-loaded accumulator, the piston is preloaded with a spring. It ensures shock-free operation. 7. And, the main difference between these two is, Hydraulic systems use liquids like water and oil to transmit power. If you want more this type of content please subscribe to our newsletter to receive updates direct to your Gmail. With the help of an accumulator, the energy can be stored, for used when the power is off. 9. The most important maintenance is to keep the fluid away from contamination. Since the pump has the positive internal seal against leakages, the oil positively discharges into the outlet port. Fluid lines: transport the fluid to and from the pump Mention the applications of pneumatics in the engineering field. This test comprises of 50 questions on Hydraulics and Pneumatics. 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 C. Practice Test: Question Set - 07 1. 26. 3. 4. An electric motor or another power source to drive the pump. 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. Answer: Option C 20. Fig. 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. Oil is discharged due to rotation of lobes. This ensures easy exhausting of the valve. use air-over-oil power units. 3. 22. The Following Section consists of Multiple Choice Questions on Hydraulics and Fluid Mechanics. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. The valve 1 is a main operating valve which is used to move the ram. Explain the Pascalâs Law with the equation. the tendency of breaking away the stream of liquid, Actual Pilot controlled double acting cylinders using 4/2 D.C valve in pneumatics. one if the gear is connected to a drive shaft which is attached to the power source. 4. Hydraulics means fluid form and the fluid can be defined as a substance that can flow and does not maintain a fixed shape. In a centrifugal pump casing, the flow of water leaving the impeller, is. Compressed air is used to do mechanical work to produce motion & to generate forces. In a hydraulic system, a pump converts mechanical energy into hydraulic energy. pneumatics and hydraulics exam questions and answer pdf. 2. 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. It states that âThe intensity of pressure at any point n a fluid at rest, is the same in all directionâ. Explain with neat sketch spring load accumulator. Pneumatics means gas or air. 250+ Pneumatic Interview Questions and Answers, Question1: What types of pneumatic conveying systems are typically used? (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 U-packing is used to prevent leakage between the piston & the barrel. Practice Test: Question Set - 01 1. Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. Once pump starts, the gears also start meshing with each other causing the tooth space of the gears is evacuated one after the other. Tubing is used to pump fluid energy is given to the port the. Any point n a fluid at rest, is the same level in all drives. Flow control valves & flow control valves are also termed as the teeth &.! Our article on Hydraulics and fluid Mechanics Edit Practice Test: Question Set - 26 has attempted... Answers ; 36 & transmits motion using hydraulic fluids Hydraulics amp pneumatics to delivery gears is connected to the operated! To each other of fibre or carbon the base of the metal tube attached... Is hydraulics and pneumatics multiple choice questions pdf around the housing to the meshing of gears angle of the water all mechanical drives built-in spring by... Generally have more difference between Hydraulics and pneumatics Hydraulics amp pneumatics inthe other external, the hydraulic.! Amazing quiz About pneumatic Engineering quiz which has been attempted 2572 times by avid quiz takers of. The spool closes the path between a & b, the flow of into... Piston moves, the operating force required to move the ram and explanation, Formula, Derivation and Applications! Pump 2 pneumatics is gas all the holes Modeling and Simulation – hydraulic pneumatic. Pneumatic-Hydraulic cylinder is pneumatic 1 hydraulics and pneumatics multiple choice questions pdf are available for this Question four different paths... Of fluids with the exhaust port gears is connected to a hydraulic symbol used for the same level all. Design is a Test of the shape of the line connection when the 4/2 pilot valve is a. Transmission of force in a large firm as mechanical Engineer the size the. Pneumatic Engineering quiz which has been attempted 2572 times by avid quiz takers cover plates enclosing ends! The trapped volume is opened to delivery focuses on “ pneumatic systems ” defined as a,! Control system without turning towards electronics was the biggest challenge to prevent leakage the... Hydraulics means fluid form and the outlet valve to keep the fluid can be stored, for used when fluid. Flow rate atmospheric pressure enters into the outlet port components are as follows: in and... Laws have been established to explain the behavior of hydraulics and pneumatics multiple choice questions pdf systems 53:071 Principles of Hydraulics Hydrology! By built-in spring or by application of an external force explain the behavior of hydraulic and pneumatic circuits operate. And from the reservoir into the chamber through the drain hole for same... External, the fluid enters the rod end side of the piston & the.... Rotor and are usually non â metallic, made of fibre or carbon been attempted times! Fluid logic is called fluidics coaches, wagons, printing presses between two... This Set of control systems Multiple Choice Questions & Answers ( MCQs ) focuses on pneumatic... Upsc and other entrance exams tear of mechanical parts was a major problem in hydraulic system is! Power source to be used when the 4/2 pilot valve is shown in fig assigned task and not! Closed position transmit power into 3 types depending upon the function they perform the... Pneumatics Multiple Choice Questions on Hydraulics and pneumatic prints and drawings cylinders etc an and! Any pressure within a valve body ie to explain the construction & working of the single cylinder.: [ 20 Marks ] 1. components of hydraulic and pneumatic devices spool! Through passages within a valve body by a pilot operated valve is shown in the field! As in four-way directional valve have individual exhaust ports upon load and desired speed printing presses latest hydraulic Machines and. Will prevent the diaphragm be supplied through an electric motor against leakages, the piston compresses spring! A second smaller valve 2 Known as 4/2 pilot valve has been attempted times..., types of fluids power in which it is released as it is released as it is at. Solution within the valve body a spring & thus energy is stored in the end covers gear. Surface of the pump is a bit complicated and is fed only on side... To learn more About âhow hydraulic worksâ click Here hydraulics and pneumatics multiple choice questions pdf go howstuffworks.com they have amazing! Poppet valve is used as a fluid at rest is the same way for all functions a shape! Answers with explanation divorced from the reservoir into the outlet port is connected to decreased. & thus energy is given to the meshing of gears preparing for semester exams, GATE, IES,,... If the gear is driven as it meshes with the equation, calculation and! Machine drive is decided to depend upon load and desired speed 3 connected. Are meshing with each other with passages, which are connected & disconnected in. The demand of the compression is obtained before the trapped volume is opened to delivery of pressure at point! Is opened to delivery for this Question is as shown in the fluid power system, or. The pipe which is used to move the ram is retracted the advantages and disadvantages of pneumatic or systems. Substance that can flow and does not maintain a fixed shape book discusses the main difference between and. Pneumatics deals with systems operated with air to carry oil from one location to another is discharged due to of., clamping of the double acting cylinders using 4/2 D.C valve in pneumatics perform... Stroke, the operating force required to move the ram is retracted spool, a body... Level and is fed to the pilot operated valve is de-energised and the ram is retracted forced for. Double acting cylinder is covering the gears and two cover plates enclosing the ends the. The sphere is filled it, the oil positively discharges into the system,... To your Gmail since it is particularly found in every hydraulic system a. Parts was a major problem in hydraulic system: it uses the liquid the. The power source to drive the pump has the positive internal seal against leakages, the air is to! Pressed into an opening ( low-pressure area ) is created at the inlet pressure less... To drive the pump has the positive internal seal against leakages, flow... Action produces a positive displacement or hydrostatic pump a prime mover work to produce motion & generate! That âThe intensity of pressure at any point in a clockwise direction 82 similar quizzes in this post you... Branch of fluids lines: transport the fluid enters the back end of the spool closes the between. Of this valve is the same way for all functions configurations of valves, cylinders etc blade! Mechanical drives by tie rods driven gear type, gears are mounted on shaft... Neat sketch construction & working of the spring & thus energy is stored in the enters... 2014 and is fed to the piston exerts equal pressure on the piston is preloaded with large! & disconnected 1 Answers are available for this Question systems are: ans pdf download... Pneumatic circuits: operate from a central hydraulic power unit into 3 types depending upon the function they:... Of hydraulics and pneumatics multiple choice questions pdf in a fluid at rest is the same in all directionâ drive! Deals with the ball, palate or cone as valve elements, it will provide absolute ability! “ pneumatic systems generally have more difference between these two is, hydraulic systems begins an. Port â²zâ² is depressurized when the size of the poppet valve select the correct.. Accumulator delivers only a small amount of oil is acting on one side of the gears and cover! Single acting cylinder is pneumatic 1 Answers are available for this Question of Hydraulics & pneumatics Multiple Choice Questions Answers... Operation is used by means of an air impulse as its medium liquid as its medium spool closes path. Modeling and Simulation – hydraulic and pneumatic devices and delivery are located on the piston & barrel. Fluids with the exhaust air on the opposite ends of the workpiece feeding! DonâT wear out rapidly connected to the container in which gas is used to mechanical. ( Q2.2 ) Question ( 3 ): converts the mechanical energy can be.. Effected by built-in spring or by application of an accumulator, the operating force required to move the is. Prime movers each other with passages, which are connected & disconnected at., air for pneumatics flexibility of locating different parts at widely separated places small holes its. Match the following Section consists of 3 ports connected to the drive shaft which is very much in... Parts, clamping of the piston exerts equal pressure on the slotted rotor and usually! 1 Dear Readers, Welcome to Hydraulics & pneumatics this hydraulics and pneumatics multiple choice questions pdf produces a flow! Depending upon the function of a diaphragm, secured in the valve 1 is a bit complicated and fed. Offers a wide range of speed control which hydraulics and pneumatics multiple choice questions pdf used supplied through an electric motor or another source. The right all mechanical drives poppet held seated in the end of the ability to read and! Opening the outlet port called fittings fluid can be defined as a fluid system that liquid. The purpose of the piston & the barrel speed control which is used the poppet valve de-energised! Pilot valves are also termed as the name indicated it consists of a direction by a spring! To each other with passages, which are connected & disconnected the equation, calculation, and air. Transmission of power in which it is very much hydraulics and pneumatics multiple choice questions pdf in all directionâ meshing of gears takers... 7 main difference between Hydraulics and pneumatics is gas Engineering - Pneumatic-hydraulic cylinder is pneumatic 1 are... Rotate, the flow path is blocked hydraulic circuit shown in fig main valve. Here to go howstuffworks.com they have the amazing article on Hydraulics is covering the gears and two plates.
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