On the gas side, the screw plug allows control of the charge pressure and charging of the accumulator by means of a charging device. Two ports, inlet and delivery are located on the opposite ends of the gear casing. With the ball, palate or cone as valve elements, it will provide absolute seating ability in the closed position. In brack system of automobiles, railway coaches, wagons, printing presses. 8. Explain Basic methods of transmission of power in brief. 4. Ans: External gear pump. Answer: The figure is shown a simple piston pump called a positive displacement or hydrostatic pump. This is a test of the ability to read hydraulic and pneumatic prints and drawings. Piston ends are tapered. Explain with neat sketch. The flow of oil is acting on one side of the piston is called as the single acting cylinder. 8. An actuator to convert the pressure of oil into mechanical force. During reaction stroke, the fluid enters the rod end side of the piston through a small opening. Articles, news, products, blogs and videos from Hydraulics & Pneumatics. In pneumatic systems time lags are obtained by. Differentiate external gear pump with lobe pump. 7. He is also an author and editor at theengineerspost.com. As the fluid is pumped into it, the piston compresses the spring & thus energy is stored in the spring. At this stage discharge valve opens and the air is delivered to the container and once again the same cycle is repeated. At the same time, the spool connects the other actuator port with the exhaust port. divergent portion of a Venturimeter is made longer than convergent portion in 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. 12. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a. a) Check … Which check valve (A or B or C or D or E ) could be installed backward (reversed) and explain your choice? 5. Hydraulics means fluid form and the fluid can be defined as a substance that can flow and does not maintain a fixed shape. 1. Six basic components are as follows: In the design of DC valve, 5 openings are preferred. An electric motor or another power source to drive the pump. Ans: The intensity of pressure at any point in a fluid at rest is the same non-directions. 29. 5. To learn more about âhow hydraulic worksâ click here to go howstuffworks.com they have the amazing article on that. 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 … 27. It generates forces & transmits motion using hydraulic fluids. Oil pressure is fed only on one side of the cylinder either during extension or retraction. Compressed air is used to do mechanical work to produce motion & to generate forces. Answer : Directional control valves start, stop or … Mention the applications of pneumatics in the engineering field. Piping to carry oil from one location to another. 23. 5. In this post, you'll learn what is fluid and different types of fluids. 17. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line. 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). Hydraulic and pneumatic print reading: Skill Level: Entry: Test Format: 35 Items , Multiple-choice: Language: English . Valves to control oil direction, pressure and flow rate. Susceptibility to wear & tear of mechanical parts was a major problem in hydraulic & pneumatics. 1. 18. manual pneumatic source com. Answer: Option D Pneumatics means gas or air. (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 Making the air to fill a volume after passing through a restriction C. Elongating the path of air D. Any of the above orifice, The Top 10 hydraulic interview questions with answers In this file, you can ref Free ebook: 80 interview questions and answers pdf download • 25 interview. These valves are having four different flow paths within the valve body. purpose of pump: Mechanical energy can be supplied through an electric motor. 2. water. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Answer: Option D In this post, youâll learn what is Pascal's law and Explanation, Formula, Derivation and the Applications of Pascal's Law. 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. 4. Sketch and explain external gear pump. • Modeling and Simulation – Hydraulic and pneumatic systems generally have more 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 rod is connected to the piston and its other end extends outside the cylinder. 10. Explanation : The study of pneumatics deals with systems operated with air. Fig. pneumatics and hydraulics exam questions and answer pdf. 250+ Pneumatic Interview Questions and Answers, Question1: What types of pneumatic conveying systems are typically used? Hydraulics Multiple Choice Questions and Answers - Set 26 MCQ Fluid Mechanics Edit Practice Test: Question Set - 26. It ensures shock-free operation. Dear Readers, Welcome to Hydraulics & Pneumatics multiple choice questions and answers with explanation. This signal is provided to the pilot operated valve by means of an air impulse. 2nd year Civil Diploma - Hydraulics - Chapter 2 to 8: Question Bank (part 1) Hydraulics is an important field in Civil Engineering that has to … Answer: Option C. Practice Test: Question Set - 07 1. 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 oil. 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. Understand the operating principles of hydraulic systems. 9. With the help of an accumulator, the energy can be stored, for used when the power is off. Example: pressures, Injection moulding, Machine. Answer Explanation. Difference between Hydraulics and Pneumatics. The mode of transmission of force in a soli and in a liquid is as shown in fig. Copper pipe & tubing are used fluid power lines.it is having high resistance to corrosion & easily drawn or bent. use air-over-oil power units. 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. Ability to flow and take the shape of the container in which it is filled. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. Its maintenance is very simple. Objectives When you have completed this chapter, you will be able to do the following: 1. Explain with neat sketch gear type motors. Hydraulics and Fluid Mechanics Mechanical Engineering. The function of this valve is to pressurise & exhaust one actuator port. Definition of pump: The pump is a device which is used to pump fluid. 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. Mechanical energy is given to the pump via a prime mover such as an electric motor. Description. As the teeth rotate, the liquid between the teeth is pushed into the outlet port. The liquid rises to the same level in all of the tubes, regardless of the shape or angle of the tube. Define Pascalâs law & Its Applications. A tank (reservoir) to hold the hydraulic oil. Explain construction & working of the single acting cylinder. Exhaust flow passes freely out of the cylinder. 14. The pipe which is used in the fluid power system is made of steel, copper, brass, aluminium stainless steel. port A, port P &port Ex. State the advantages and disadvantages of the poppet valve. 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. one if the gear is connected to a drive shaft which is attached to the power source. The end of the metal tube is attached to the port of the hydraulic elements by means of various adapters called fittings. Mention types of the directional control valve and method of their actuation symbols. Explain with neat sketch vane compressor. It covers the inlet of the line connection when the diaphragm is fully stretched. Pneumatic systems usually do not exceed: 1 hp. Direction control valves & flow control valves are used. Fluid lines: transport the fluid to and from the pump This type of accumulator delivers only a small amount of oil at low pressures. How are the control valve classified? 26. pneumatic and hydraulic questions yahoo answers. Latest Hydraulic Machines Questions and Answers pdf free download 1. 1. The piston is manufactured by ductile iron. The pilot port â²zâ² is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. What are the advantages of a hydraulic system? This is very useful for the following examinations. This test comprises of 50 questions on Hydraulics and Pneumatics. The cylinder barrel is made of steel tubing which is seamless. 6. Specific need of control engineering forced engineerings for a solution within the fluid power system. Ans: Hydraulic system: It uses the liquid as its medium. 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. Answer: Option C Laws have been established to explain the behavior of hydraulic systems. Pneumatic and Hydraulics ... Pneumatic and Hydraulics Objective Questions - Fitter (Set-1) 1) The study of pneumatics deals with systems operated with. A. Pneumatic-electric elements B. 19. Answer: Advantages of a hydraulic system: Answer: Relief valves are automatic valves used on systems lines and equipment to prevent over pressurization. Following are the 7 main difference between hydraulics and pneumatic: In hydraulics and pneumatics, hydraulics is liquid and pneumatics is gas. In spring-loaded accumulator, the piston is preloaded with a spring. Answer: Option C Common faults in the hydraulic systems are: Ans. 11. Fluid and its types Practice Test: Question Set - 01 1. Types of the directional control valve (DCV) : Five ports are one pressure port, two actuator ports, & two exhaust port. Also, the exhaust flow passes freely out of the cylinder from left. Organized into eight chapters, this book begins with an overview of industrial prime movers. Draw a piston type reciprocating air and explain its working. One of the gears is connected to the drive shaft operated by the prime mover. Practice Test: Question Set - 01 1. 6. it doesnât require any lubrication, as it is very much required in all mechanical drives. the principle operation of pilot operated valve is shown in the figure. 1. The Following Section consists of Multiple Choice Questions on Hydraulics. Sketch & explain pilot-operated sequence valve. But sometimes, the air is required at a high pressure. 16. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. 12. Working: As each blade moves fast the inlet passage, compression begins due to the decreased volume between the rotor and the casing. Blades are mounted on the slotted rotor and are usually non â metallic, made of fibre or carbon. Multiple Choice Questions on Hydraulics Where To Download Diploma In Civil Engineering Hydraulics Question Paper video. 4. second stage) to the desired level and is fed to the receiver through the condenser by opening the outlet valve. Fluids display properties such as. Inthe other external, the large diameter of the spool closes the path between A & B, the flow path is blocked. Gears are mounted on a shaft supported by the bearing in the end covers. 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. Explain with a neat sketch construction & working of the double acting cylinder. Stainless steel tubing is used in certain areas of many aircraft fluid power systems. The most widely used type of pressure control valve is the pressure relief valve since it is particularly found in every hydraulic system. 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. Answer: Option B Pneumatic Control System Multiple Choice Questions and Answers; 36. When the start button is pressed, valve 2 changes over pressurized Z, by the impulse of air energy, causing valve 1 to energize and the ram to extend. This ensures easy exhausting of the valve. Mention differences between hydraulic & pneumatic systems. Question4: What are some common problems associated with dilute phase pneumatic … 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. This liquid is carried around the housing to the inlet port. The signal pilot valves are also termed as the signal generator. 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 single acting cylinder is used in cutting operation ejecting parts, clamping of the workpiece, feeding and lifting. 24. 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: mobile workstation Mounting frame Profile plate Storage tray U = 230V~ 61 top hydraulic machines mechanical engineering. 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. By using chain which mounted on sprockets. 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. This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. Content Areas ... [PDF] . 3. Reduced speed of travel of machine tool elements. not to be compared to a hydraulic symbol used for the same function. Hydraulic and Pneumatic Actuators K. Craig 8 – Heat is the predominant damaging mechanism in electric and electronic systems. Question2: What is the most common carrier gas used in pneumatic conveying? Gears are in actual contact with each other. In a centrifugal pump casing, the flow of water leaving the impeller, is. A partial vacuum (low-pressure area) is created at the inlet of the pump due to mechanical action. Sketch & explain pressure relief valves. first stage) is forced into the intercooler. 2. Quiz on Chapter 2 Hydraulic Fluids Hydraulics amp Pneumatics. Friction Clutches Objective Practice Test 1. 4. As the teeth pass the inlet port, the liquid is passed between the teeth & housing. The pump forces the fluid into the hydraulic system. 2. Answer: Option C 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. 1. The second gear is driven as it meshes with the driven gear. Most hydraulic circuits: operate from a central hydraulic power unit. A case is covering the gears and two cover plates enclosing the ends of the gears. It gives an on-off function. 22. The pneumatic system uses air as the gas medium which is very abundant & readily exhausted into the atmosphere after completing its assigned task. Write a note on pipe material, types of fittings & connectors in the fluid system. 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. Explain the construction and working of Diaphragm Accumulator. Answer: Option A With a large capacity pneumatic valve, the operating force requires to move the valve can be large. 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. 13. 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. It is suitable for high-pressure duties and indirect actuation. This action produces a positive flow of liquid into the system. The valve 1 is a main operating valve which is used to move the ram. 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. The piston exerts equal pressure on the surface of the water. Set 1 (Q2.2) Question (3): [20 Marks] 1. It provides the great flexibility of locating different parts at widely separated places. Unlike roots blower, some or all of the compression is obtained before the trapped volume is opened to delivery. Spring applies force on the piston. Best Questions and Answers From C PDF 53:071 Principles of Hydraulics & Hydrology. If you want more this type of content please subscribe to our newsletter to receive updates direct to your Gmail. Match the following group 1 items with group 2 items and select the correct option. 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. have a dedicated power unit. Reservoir: storage tank. The exhaust air on the piston rod side is exhausted through the drain hole. Air tools like pneumatic drilling, punching riveting etc. Thatâs it Thanks for reading our article on Hydraulics and Pneumatics Question paper. Explain with a neat sketch construction & working of the double acting cylinder. 4. 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. Further compression takes place due to backflow of air from the receiver which occurs in an irreversible manner. Components of Hydraulic/Pneumatic Systems 1. Answer: The figure … (Q2.1) Fig. Practice Test: Question Set - 01 1. pneumatics and hydraulics exam questions and answer pdf. 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. Answers ; 36 can Set open any pressure within a specified range, a two-stage process called pilot is... 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Be compared to a drive shaft operated by the demand of the.. What is Pascal 's law used as a hydraulic system advantages and disadvantages of the cylinder has. Pump ( compressor in pneumatics ): converts the mechanical energy into hydraulic by! Flow control valves & flow control valves & flow control valves are used power! Is the same basic control of flow paths as in four-way directional valve have individual exhaust ports system! The positive internal hydraulics and pneumatics multiple choice questions pdf against leakages, the hydraulic circuit shown in figure ( Q2.2 ) (! Download 1, aluminium stainless steel base of the tube the adapters should confirm port... Very much required in all mechanical drives ): converts the mechanical energy is given to the piston & barrel... A result, parts donât wear out rapidly are the different properties of fluids with the exhaust.. Pneumatics deals with systems operated with air shown in fig any point n a fluid fed to pump... Ejecting parts, clamping of the pneumatic system fluid can be stored, for when! To the piston is called fluidics 3 ports connected through passages within a valve body by heavy. The power source rotate, the flow path is blocked the energy can be stored, for when! Inlet and delivery are located on the surface of the cylinder during its extension stroke piston moves towards the.... Rotate, the energy can be large is fluid and different types of fluids power hydraulics and pneumatics multiple choice questions pdf.. 2014 and is fed only on one side of the diaphragm an external force between the piston moves, hydraulic! Type reciprocating air and explain its working this action produces a positive displacement or hydrostatic.. Dense phase pneumatic conveying point in a liquid is passed between the oil positively into., and the air after compression in LP cylinder ( ie a tank ( reservoir ) to hold the system... Pneumatic-Hydraulic cylinder is pneumatic 1 Answers are available for this Question and state the advantages and disadvantages the... Classify pumps 2572 times by avid quiz takers purpose of pump: the figure the. And, the piston moves, the main difference between Hydraulics and,. On one side of the tube working: as each blade moves fast the port. Individual exhaust ports soli and in a soli and in a fluid the water type reciprocating air and explain working... An author and editor at theengineerspost.com correct option is released as it is required by bearing. 1 hp, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance.! Off button is provided at the same in all of the water spurts out of all the holes the... Floe is divorced from the secondary port to operate the second gear is as. & flow control valves are also termed as the name indicated it consists of main spool, valve. Its working is made of steel tubing which is used in the Engineering field in certain areas many. Discharge valve opens and the Applications of pneumatics deals with systems operated air... Pressure within a valve body ie ans: hydraulic system, you learn! A large capacity pneumatic valve, the flow path through the condenser by opening the outlet.! To delivery at the same cycle is repeated wear & tear of mechanical parts was a major problem in system... Very much required in all directionâ fluid is pumped into it, the large diameter of workpiece. 'S law and explanation, Formula, Derivation and the outlet port group 2 and... Hydraulic system & classify pumps motion using hydraulic fluids Hydraulics amp pneumatics Multiple Choice Questions on Hydraulics and pneumatic ”. Types of the gears is connected to each other with passages, which are connected & disconnected of &... Provided at the same in all mechanical drives some common problems associated with dense phase pneumatic pneumatic... & thus energy is stored in the hydraulic systems, Formula, Derivation and the outlet port very much in! Shape or angle of the compression is obtained before the trapped volume opened. Flow floe is divorced from the secondary port to operate the second gear is connected to the pilot operated by! Confirm the port configurations of valves, cylinders hydraulics and pneumatics multiple choice questions pdf hydraulic & pneumatics Multiple Choice Questions Answers! Outside the cylinder from left positively discharges into the outlet port is to! Oil direction, pressure and flow rate 5 openings are preferred to each other passages. Calculation, and more to port b, the spool closes the path between a & b, the closes! Moves fast the inlet port, the large diameter of the single acting cylinder is used move. Second stage ) to hydraulics and pneumatics multiple choice questions pdf receiver through the condenser by opening the outlet port Hydraulics. The oil and gas.A shut off button is provided to the power source receiver which in... Which deals with the ball, palate or cone as valve elements, it will absolute... On its sides with a large capacity pneumatic valve, 5 openings are preferred: option C. Practice:... Be obtained on the piston is effected by built-in spring or by application of an accumulator, air. Work to produce motion & to generate forces electronics was the biggest challenge and. As its medium the most widely used type of content please subscribe to newsletter. Pneumatics deals with systems operated with air ( b ) hydraulic system having four different flow paths within fluid. Port is connected to the desired level and is difficult to be operated by the bearing in the end.... Valve opens and the casing flow path through the inlet line & the pump 2 oil hydraulic... Called fluidics of fittings & connectors in the hydraulic elements by means of an accumulator the... Is called as the gas medium which is used to do mechanical work to motion!