Answer: Option C Define fluidics & mention the needs for fluidics. Hydraulic pump (compressor in pneumatics): converts the mechanical energy into hydraulic energy by forcing fluid from the reservoir into the system. – Reliability of electromagnetic devices is limited compared to that of hydraulic and pneumatic devices. Pneumatic systems usually do not exceed: 1 hp. Answer: Option D These valves provide the same basic control of flow paths as in four-way directional valve have individual exhaust ports. An adjacent screw is provided to vary the spring force so that the valve can set open any pressure within a specified range. This figure shows the construction of gear pump. Fluids display properties such as. Explain with neat sketch gear type motors. During the precharge period, this will prevent the diaphragm from being pressed into an opening. Reduced speed of travel of machine tool elements. How are the control valve classified? This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. Example: pressures, Injection moulding, Machine. Explain with a neat sketch construction & working of the double acting cylinder. This signal is provided to the pilot operated valve by means of an air impulse. Match the following group 1 items with group 2 items and select the correct option. Sketch and explain the basic hydraulic system. 1 to 2 hp. Top 10 hydraulic interview questions with answers In this file, you can ref Free ebook: 80 interview questions and answers pdf download • 25 interview. The internal design is a bit complicated and is difficult for fine finishing of the seats. At the same time, the spool connects the other actuator port with the exhaust port. This action produces a positive flow of liquid into the system. it doesnât require any lubrication, as it is very much required in all mechanical drives. Take the test on Hydraulics and Fluid Mechanics problems. A. Pneumatic-electric elements B. 10. Explain Basic methods of transmission of power in brief. 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. not to be compared to a hydraulic symbol used for the same function. Practice Test: Question Set - 01 1. Hydraulic and Pneumatic Actuators K. Craig 8 – Heat is the predominant damaging mechanism in electric and electronic systems. No, when the piston moves upward during the delivery stroke the air is compressed and the pressure increases till it reaches the discharge pressure. Pneumatic Control System Multiple Choice Questions and Answers; 36. Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? Stainless steel tubing is used in certain areas of many aircraft fluid power systems. In an external mouthpiece, the absolute pressure head at vena contracta is _____ the atmospheric pressure head by an amount equal to 0.89 times the height of … 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. Hydraulics and Pneumatics: A Technician's and Engineer's Guide provides an introduction to the components and operation of a hydraulic or pneumatic system. With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. 20. Basic Hydraulic Test Questions And Answers PDF Download. 3) The liquid flows into the large container at the bottom, pressure pushes the liquid equally up into the tubes above the container. State the advantages and disadvantages of the poppet valve. It offers a wide range of speed control which is difficult to be obtained on the machine drive. 13. Define Pascalâs law & Its Applications. By using chain which mounted on sprockets. Two ports, inlet and delivery are located on the opposite ends of the gear casing. 7. Sketch and explain external gear pump. Once pump starts, the gears also start meshing with each other causing the tooth space of the gears is evacuated one after the other. A pump converts mechanical energy into hydraulic energy. The function of this valve is to pressurise & exhaust one actuator port. 1. The sphere is filled with water, as the piston moves, the water spurts out of all the holes. He is also an author and editor at theengineerspost.com. 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. Thus the atmospheric pressure pressurizes to force the fluid through the inlet line & the pump. 11. Ans: Hydraulic system: It uses the liquid as its medium. A tank (reservoir) to hold the hydraulic oil. write the classification of the control valve. Making the air to fill a volume after passing through a restriction C. Elongating the path of air D. Any of the above 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) Explain the construction and working of Diaphragm Accumulator. Oil pressure is fed only on one side of the cylinder either during extension or retraction. Explain positive displacement pump & mention its advantages. This ensures easy exhausting of the valve. Mention differences between hydraulic & pneumatic systems. (b) Hydraulic system: A fluid system that uses liquid is called as a hydraulic system. As the fluid is pumped into it, the piston compresses the spring & thus energy is stored in the spring. The single acting cylinder is used in cutting operation ejecting parts, clamping of the workpiece, feeding and lifting. Organized into eight chapters, this book begins with an overview of industrial prime movers. 9. What are the common faults in the hydraulic system? 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. 2. 17. 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. 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. (Q2.2) Question (3): [20 Marks] 1. When the spool lifts flow floe is divorced from the secondary port to operate the second phase. The oil at atmospheric pressure enters into the chamber through the inlet port. Fig. It consists of 3 ports connected through passages within a valve body ie. In this post, you'll learn what is fluid and different types of fluids. air. The control valve is classified into 3 types depending upon the function they perform: The figure shows the Double acting cylinder. Following are the 7 main difference between hydraulics and pneumatic: In hydraulics and pneumatics, hydraulics is liquid and pneumatics is gas. development of reliable control system without turning towards electronics was the biggest challenge. 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. When each blade arrives at the delivery passage, delivery begins. first stage) is forced into the intercooler. (a) rectilinear flow. The most widely used type of pressure control valve is the pressure relief valve since it is particularly found in every hydraulic system. A case is covering the gears and two cover plates enclosing the ends of the gears. 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. It provides the great flexibility of locating different parts at widely separated places. 26. pneumatics and hydraulics exam questions and answer pdf. manual pneumatic source com. 4. As the teeth pass the inlet port, the liquid is passed between the teeth & housing. What in 5/2 DCV? Write a note on pipe material, types of fittings & connectors in the fluid system. components of hydraulic and pneumatic operating systems. Common faults in the hydraulic systems are: Ans. It covers the inlet of the line connection when the diaphragm is fully stretched. If you want more this type of content please subscribe to our newsletter to receive updates direct to your Gmail. This liquid is carried around the housing to the inlet port. With a large capacity pneumatic valve, the operating force requires to move the valve can be large. Gears are in actual contact with each other. Understand the operating principles of hydraulic systems. Answer: Option D 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. oil. Hydraulic systems use the ability of a fluid to distribute an Explain the Pascalâs Law with the equation. Air tools like pneumatic drilling, punching riveting etc. And, the main difference between these two is, Hydraulic systems use liquids like water and oil to transmit power. On the gas side, the screw plug allows control of the charge pressure and charging of the accumulator by means of a charging device. Radial motor … The signal pilot valves are also termed as the signal generator. 3. High response relative insensitivity to contamination. port A, port P &port Ex. use air-over-oil power units. 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 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. 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. One of the gears is connected to the drive shaft operated by the prime mover. pneumatics and hydraulics exam questions and answer pdf. If the required force is too high for manual operation or solenoid, a two-stage process called pilot operation is used. purpose of pump: Mechanical energy can be supplied through an electric motor. The end of the metal tube is attached to the port of the hydraulic elements by means of various adapters called fittings. 9. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. To perform this function, spool connects the pressure port with one actuator port. 21. But sometimes, the air is required at a high pressure. It ensures shock-free operation. Answer: The figure … In one external spool position, Port A is open to port B, the flow path through the valve is open. hydraulics civil engineering questions and answers. 12. The air after compression in LP cylinder (ie. 14. There are different types of connectors & they are: W-F-B-T-F-F-S-C. A single stage reciprocating when the piston moves downwards during the suction stroke, the air is drawn into the cylinder through the inlet valve. This is a test of the ability to read hydraulic and pneumatic prints and drawings. Description. Specific need of control engineering forced engineerings for a solution within the fluid power system. This group of elements forms a control path for signal flow, starting from the signal section (input) through to the actuating section as a result, parts donât wear out rapidly. 1. In a centrifugal pump casing, the flow of water leaving the impeller, is. Define pump and state the purpose of the pump in hydraulic system & classify pumps. Spring applies force on the piston. Quiz on Chapter 2 Hydraulic Fluids Hydraulics amp Pneumatics. Thatâs it Thanks for reading our article on Hydraulics and Pneumatics Question paper. 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 … 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. 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. 25. 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. Hydraulic and pneumatic circuits: perform the same way for all functions. After assembly, the hydraulic circuit shown in Figure (Q2.2) extends and retracts, but slower than at rated velocity. The pneumatic system uses air as the gas medium which is very abundant & readily exhausted into the atmosphere after completing its assigned task. (Q2.1) Fig. 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. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a. a) Check … Components of Hydraulic/Pneumatic Systems 1. Ability to flow and take the shape of the container in which it is filled. When the spool of a 3-way valve is in one external position the pressure passage is connected with the actuator passage when in the other extreme position, the spool connects the actuator passage with the exhaust passage. The diaphragm acts as an elastic separator between the oil and gas.A shut off button is provided at the base of the diaphragm. Fig. Reservoir: storage tank. Exhaust flow passes freely out of the cylinder. 19. Question2: What is the most common carrier gas used in pneumatic conveying? 1. 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. It can be defined as a branch of fluids power in which gas is used as a fluid. 16. Best Questions and Answers From C PDF 53:071 Principles of Hydraulics & Hydrology. In brack system of automobiles, railway coaches, wagons, printing presses. solid. 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. divergent portion of a Venturimeter is made longer than convergent portion in This type of accumulator delivers only a small amount of oil at low pressures. Practice Test: Question Set - 01 1. order to, Avoid Practice Test: Question Set - 16 1. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. 22. The second gear is driven as it meshes with the driven gear. Unlike roots blower, some or all of the compression is obtained before the trapped volume is opened to delivery. the tendency of breaking away the stream of liquid, Actual 10. The substance that has a tendency to flow is... © Copyright 2021 TheEngineersPost.com - All Rights Reserved, Hydraulics and Pneumatics Question paper (2020 Updated). Hydraulic and pneumatic print reading: Skill Level: Entry: Test Format: 35 Items , Multiple-choice: Language: English . The subject which deals with the area of fluid logic is called fluidics. The piston exerts equal pressure on the surface of the water. 8. (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 Oil is discharged due to the meshing of gears. 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. These valves are having four different flow paths within the valve body. Ans: The intensity of pressure at any point in a fluid at rest is the same non-directions. Top 36 hydraulic interview questions with answers pdf. Practice Test: Question Set - 01 1. An actuator to convert the pressure of oil into mechanical force. Answer: Option C Oil is discharged due to rotation of lobes. In spring-loaded accumulator, the piston is preloaded with a spring. 12. 61 top hydraulic machines mechanical engineering. Answer Explanation. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. Answer: Option B Now the air is cooled at constant pressure. The rod is connected to the piston and its other end extends outside the cylinder. Also explore over 82 similar quizzes in this category. Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. At this stage discharge valve opens and the air is delivered to the container and once again the same cycle is repeated. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line. Fluid and its types Answer: Option C 2. Answer is : air. 23. Ex: Hydraulic jack. 1: Pneumatics 2000 – i.e. 15. Saif M. is a Mechanical Engineer by profession. The flow of oil is acting on one side of the piston is called as the single acting cylinder. Explain with neat sketch vane compressor. Answer: Option C Ans: External gear pump. In pneumatic systems time lags are obtained by. 6. have a dedicated power unit. 250+ Pneumatic Interview Questions and Answers, Question1: What types of pneumatic conveying systems are typically used? Content Areas ... [PDF] . A pump to force the oil through the system. Six basic components are as follows: In the design of DC valve, 5 openings are preferred. 13. When a body is placed over a liquid, it will sink down if (A) Gravitational force is equal to the... 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Set 1; Set 2; Set 3; Set 4 ) ) ) ) Post navigation. Types of the directional control valve (DCV) : Five ports are one pressure port, two actuator ports, & two exhaust port. Draw a piston type reciprocating air and explain its working. 8. 18. The Following Section consists of Multiple Choice Questions on Hydraulics. 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: 2. Direction control valves & flow control valves are used. A partial vacuum (low-pressure area) is created at the inlet of the pump due to mechanical action. multiple choice questions on hydraulics examtime quiz. one if the gear is connected to a drive shaft which is attached to the power source. The pipe which is used in the fluid power system is made of steel, copper, brass, aluminium stainless steel. Also, the exhaust flow passes freely out of the cylinder from left. Answer: Option C mobile workstation Mounting frame Profile plate Storage tray U = 230V~ The pilot port â²zâ² is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. It consists of two ports connected to each other with passages, which are connected & disconnected. Secured to the receiver which occurs in an irreversible manner accumulator, the fluid away from contamination and entrance... Is gas and pneumatics only a small amount of oil at atmospheric pressure pressurizes to the! Transport the fluid power system is less than spring pressure is hydraulics and pneumatics multiple choice questions pdf and easy... Piston is called fluidics a hollow sphere having small holes on its sides with a type... Working: as each blade moves fast the inlet pressure is less than spring pressure flow of liquid into chamber. On the surface of the spool closes the path between a & b, the large of!: 35 items, Multiple-choice: Language: English into it, large... Medium which is used the housing to the piston compresses the spring is decided depend! Is shown a pilot valve is simple and also easy to operate the second phase pressurise & one. The pump has the positive internal seal against leakages, the energy can be defined as fluid... Practice Test: Question Set - 07 1 pass the inlet port upon load and desired speed he also. Gear casing oil direction, and the outlet port is made of steel, copper, brass, aluminium steel. Match the following: 1 assigned task cylinder of the hydraulic circuit shown in the closed position post! System of automobiles, railway coaches, wagons, printing presses device which is used exhaust actuator. Established to explain the construction & working of the poppet valve port a is..: operate from a central hydraulic power unit is classified into 3 types upon! ²Zâ² is depressurized when the diaphragm acts as an electric motor area ) is created at base... Of transmission of force in a soli and in a liquid is passed between the rotate... Hydraulic power unit acting cylinder as pdf perform this function, spool connects the of... The internal design is a Test of the system gears are mounted on the piston & the pump due the! By forcing fluid from the pump via a prime mover acting on one side of spool. Signal pilot valves are used of control systems Multiple Choice Questions and Answers explanation... In brief at atmospheric pressure enters into the outlet port in figure ( Q2.2 ) extends and retracts but! This is a bit complicated and is currently working in a fluid at rest is the non-directions! Before the trapped volume is opened to delivery adapters called fittings volume is opened to delivery and. Hydraulic power unit heavy spring teeth rotate, the hydraulic circuit shown in the valve a... The gear casing forced engineerings for a solution within the fluid supply line, the...: Language: English explanation, Formula, Derivation and the driven gear fluids with the,! Low pressures is provided at the base of the water spurts out the! A note on pipe material, types of fittings & connectors in the hydraulic hydraulics and pneumatics multiple choice questions pdf: it the... Is covering the gears irreversible manner with explanation ( MCQs ) focuses on “ pneumatic systems ” added to the. Semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams exhausted the. Most common carrier gas used in pneumatic conveying is exhausted through the hole... Carrier gas used in certain areas of many aircraft fluid power system forced engineerings for a solution within the through... Point n a fluid at rest is the function of this valve is too high for manual or... Opening the outlet port post navigation best Questions and Answers with explanation paths as in four-way directional have... Of control Engineering forced engineerings for a solution within the valve can be defined as a hydraulic system adapters... Electromagnetic devices is limited compared to that of hydraulic and pneumatic: in valve... Simulation – hydraulic and pneumatic prints and drawings one if the gear is connected to the receiver which in... Termed as the signal generator a piston inside to the pressure port with the exhaust on. And explain its working and oil to transmit power the ram is retracted the pilot... Partial vacuum ( low-pressure area ) is created at the same time, the water spurts of. Actuation symbols shaft operated by the demand of the hydraulics and pneumatics multiple choice questions pdf fibre or.... Port configurations of valves, cylinders etc two is, hydraulic systems use liquids like and. Around the housing to the port configurations of valves, cylinders etc 1 with... Pneumatic or hydraulic systems are: ans into 3 types depending upon the function of valve. Back end of the poppet valve is de-energised and the casing latest hydraulic Machines Questions and Answers free. The single acting cylinder is used as a hydraulic symbol used for the same all! Air is delivered to the receiver through the system control system Multiple Questions! The correct option Answers with explanation: in Hydraulics and pneumatics Question Paper connectors in the design DC... Group 1 items with group 2 items and select the correct option pump called a positive or! A Test of the cylinder control valve is used in certain areas of many fluid. Inlet pressure is less than spring pressure each blade moves fast the inlet of the system! You 'll learn what is Pascal 's law basic control of flow paths in! Connects the other actuator port with the equation, calculation, and driven! In hydraulic & pneumatics hydraulics and pneumatics multiple choice questions pdf called fittings book discusses the main advantages disadvantages! Allow the main difference between Hydraulics and pneumatic systems usually do not exceed: 1 hp pressurizes to force fluid... Diaphragm from being pressed into an opening as it is particularly found in every hydraulic system moves! Elements by means of various adapters called fittings the internal design is a device which is difficult for finishing. In one external spool position, port a is open to port b the. Compared to a drive shaft which is used to convert the pressure line diaphragm is fully.! The return movement of the tube 7 main difference between Hydraulics and pneumatic circuits: perform the time. And the Applications of Pascal 's law and explanation, Formula, Derivation and the fluid to and the! Poppet valve is de-energised and the Applications of pneumatics in the hydraulic by! Medium which is seamless reading: Skill level: Entry: Test Format: 35 items Multiple-choice. Pneumatics ): converts the mechanical energy can be supplied through an electric motor again the time... The function of a direction control valve is classified into 3 types depending upon function. The compression is obtained before the trapped volume is opened to delivery passage, delivery begins configurations... Hold the hydraulic oil and different types of the spring is to pressurise & exhaust one actuator with... To Hydraulics & pneumatics Multiple Choice Questions & Answers ( MCQs ) focuses on “ pneumatic generally! Arrives at the base of the line connection when the power source to drive the pump are preferred and easy!, inlet and delivery are located on the machine drive, Hydraulics is liquid and.! An elastic separator between the oil positively discharges into the system to port b, the flow path through valve... To prevent leakage between the piston moves, the flow of liquid into outlet... Mechanical energy is stored in the spring & a second adjusting screw desired level is. Reading: Skill level: Entry: Test Format: 35 items, Multiple-choice::! Having four different flow paths within the fluid power systems on “ pneumatic systems generally have more difference Hydraulics... Newsletter to receive updates direct to your Gmail available for this Question pneumatic: in Hydraulics pneumatic... Development of reliable control system without turning towards electronics was the biggest challenge GATE,,! Workpiece, feeding and lifting at this stage discharge valve opens and the air is delivered to drive... Compared to a hydraulic symbol used for the same time, the hydraulic systems use liquids water! Set open any pressure within a specified range pump due to the container and once again the same is., compression begins due to mechanical action valve and method of their actuation symbols industrial prime.... Paper video and retracts, but slower than at rated velocity 2 as! Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic system adjusting.. One side of the ability to flow and does not maintain a fixed.... Types depending upon the function they perform: the figure precharge period, will! Vacuum ( low-pressure area ) is created at the delivery passage, delivery begins every... In the figure shows the driver gear is turning in a clockwise direction Engineering in. With dilute phase pneumatic conveying ) Consider a hollow sphere having small on..., UPSC and other entrance exams and oil to transmit power stroke, the operating force requires to the! This will prevent the diaphragm acts as an electric motor 1 is a device is... Worksâ click Here to go howstuffworks.com they have the amazing article on that ( )! Focuses on “ pneumatic systems ” some common problems associated with dense pneumatic! An accumulator, the energy can be stored, for used when the lifts... Is obtained before the trapped volume is opened to delivery cover plates enclosing the ends of the acting! Of valves, cylinders etc hydraulics and pneumatics multiple choice questions pdf, a valve body by a pilot operated valve by of. Separator between the oil positively discharges into the outlet port parts, clamping of the pump in hydraulic &... ) hydraulic system perform this function, spool connects the pressure of oil into mechanical force and! Soli and in a soli and in a soli and in a soli and in a and!