Blades are mounted on the slotted rotor and are usually non â metallic, made of fibre or carbon. 3. Pneumatics means gas or air. 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. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Organized into eight chapters, this book begins with an overview of industrial prime movers. Answer: Option A Exhaust flow passes freely out of the cylinder. When the fluid enters the back end of the cylinder during its extension stroke piston moves towards the right. Oil is discharged due to rotation of lobes. This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Pneumatic Systems”. In a centrifugal pump casing, the flow of water leaving the impeller, is. pneumatics and hydraulics exam questions and answer pdf. 9. The pump forces the fluid into the hydraulic system. 21. Spring applies force on the piston. Answer: Option C Hydraulics means fluid form and the fluid can be defined as a substance that can flow and does not maintain a fixed shape. 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. Oil pressure is fed only on one side of the cylinder either during extension or retraction. Once pump starts, the gears also start meshing with each other causing the tooth space of the gears is evacuated one after the other. Pilot controlled double acting cylinders using 4/2 D.C valve in pneumatics. On the gas side, the screw plug allows control of the charge pressure and charging of the accumulator by means of a charging device. (c) Pneumatic system: A system that uses compressed air for power generation & transmission of force is called as the pneumatic system. Answer: The figure is shown a simple piston pump called a positive displacement or hydrostatic pump. 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. After assembly, the hydraulic circuit shown in Figure (Q2.2) extends and retracts, but slower than at rated velocity. The return movement of the piston is effected by built-in spring or by application of an external force. The figure shows a simple pressure relief valve consisting of poppet held seated in the valve body by a heavy spring. They are secured to the barrel by tie rods. 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. In this post, you'll learn what is fluid and different types of fluids. Fig. In one external spool position, Port A is open to port B, the flow path through the valve is open. For rotary motion, motors are used. Ans. No, when the piston moves upward during the delivery stroke the air is compressed and the pressure increases till it reaches the discharge pressure. Explain the construction and working of Diaphragm Accumulator. If the required force is too high for manual operation or solenoid, a two-stage process called pilot operation is used. 4. The control valve is classified into 3 types depending upon the function they perform: The figure shows the Double acting cylinder. 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. Fluid: oil for hydraulic systems, air for pneumatics. port A, port P &port Ex. Answer Explanation. 13. 1. And, the main difference between these two is, Hydraulic systems use liquids like water and oil to transmit power. 23. Define Pascalâs law & Its Applications. 1. Answer: Option D Objectives When you have completed this chapter, you will be able to do the following: 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. 22. Answer: Option C Also, the exhaust flow passes freely out of the cylinder from left. it doesnât require any lubrication, as it is very much required in all mechanical drives. 3. Fig. 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. Pneumatic Control System Multiple Choice Questions and Answers; 36. 2. These valves provide the same basic control of flow paths as in four-way directional valve have individual exhaust ports. Air tools like pneumatic drilling, punching riveting etc. The pilot port â²zâ² is depressurized when the 4/2 pilot valve is de-energised and the ram is retracted. Dear Readers, Welcome to Hydraulics & Pneumatics multiple choice questions and answers with explanation. Articles, news, products, blogs and videos from Hydraulics & Pneumatics. The piston is manufactured by ductile iron. divergent portion of a Venturimeter is made longer than convergent portion in The internal design is a bit complicated and is difficult for fine finishing of the seats. An electric motor or another power source to drive the pump. velocity of jet at vena contracta to the theoretical velocity, Loss In this type, gears are meshing with each other. 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. Answer: Option A This book discusses the main advantages and disadvantages of pneumatic or hydraulic systems. 61 top hydraulic machines mechanical engineering. 11. In a hydraulic system, a pump converts mechanical energy into hydraulic energy. The operating force required to move the valve is too high. components of hydraulic and pneumatic operating systems. 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. Hydraulics and Pneumatics: A Technician's and Engineer's Guide provides an introduction to the components and operation of a hydraulic or pneumatic system. Understand the operating principles of hydraulic systems. The fluid enters the back end of the ability to flow and does not maintain fixed. Difference between these two is, hydraulic systems are: ans ( reservoir ) hold., railway coaches, wagons, printing presses the pump is a Test of ability. 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