Hydraulic Machines

Dhristi JEE 2022-24

Introduction to Hydraulic Machines

The hydraulic machines generally use a liquid fluid that is the power to perform work. Here, we will discover even more about it. The construction of vehicles is a common example. In this type of machine which is the hydraulic machine, the hydraulic fluid is pumped to various hydraulic motors and even to the hydraulic cylinders throughout the machine and then it becomes pressurized according to the resistance present. The fluid which we have just seen is controlled directly or we can do that automatically by controlling valves and distributing through hoses, tubes, or we can say pipes.


The system which is hydraulic is like pneumatic systems which are based on Pascal's law which states that any pressure which is applied to a fluid that is inside a closed system will transmit that pressure equally everywhere and in all directions. A system like the hydraulic system uses an incompressible liquid as its fluid and rather than a compressible gas.

Hydraulic Machines and their Applications

Hydraulic Lifts: The hydraulic lift that we are discussing is an elevator that is operated by fluid pressure generated by a suitable fluid. It is generally used to raise automobiles in service stations and even in garages. In a hydraulic lift, two pistons are separated by the space which is filled with a liquid. A piston that is there is a small cross-section A1 is used to exert a force that is, say, F1 directly on the liquid. The pressure denoted by P =F/A is transmitted throughout the liquid to the larger cylinder which is in turn attached to a larger piston of area denoted as A2 which results in an upward force that is denoted by  P × A2.


Therefore, we can say that the piston is capable of supporting a large force that is the large weight of say a car or a truck that is placed on the platform.


By changing the force at an area that is A1 the platform can be moved up or down. Thus we can say that the applied force has been increased by a factor of A2/A1  and this factor is the mechanical advantage that is of the device.


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Hydraulic Brakes: The breakers which are called the hydraulic brake are an arrangement of the braking mechanism in which suitable brake fluid is used to transfer pressure from the control mechanism to the mechanism of the brake. Hydraulic brakes in automobiles also work on the same principle. When we apply a little bit of force to the pedal with our foot then the master piston moves inside the master cylinder and after that, the pressure caused is transmitted through the brake oil which is to act on a piston of the larger area. A large force generally acts on the piston and is pushed down and is now expanding the brake shoes against the brake lining. In this way, we have seen that a small force on the pedal produces a large retarding force on the wheels.


 An important advantage of the system of hydraulic brakes is that the pressure set up by pressing a pedal is transmitted equally to all cylinders that are generally attached to the four wheels so that the braking effort is equal on all the wheels.


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To learn more about hydraulic machinery and other related topics we could simply go to some of the videos of our site vedantu.com. 


Hydraulic Machines Uses

The application of hydraulics in everyday life has become so normal to people that nobody ever thinks about it anymore but still, we can say that we will see it here.

  • Today as we know virtually in every industry we see the use of hydraulics to move machinery and equipment to accomplish various tasks including tractors in agriculture. Some more examples are cranes in building & construction and forklift in manufacturing and production warehouses braking in transportation and many more.

  • The hydraulic machines utilize hydraulic fluid pressure to primarily power movement or we can say that as a basic source of energy.

  • The Hydraulic machines also include dumps trucks and the aluminum extruders or the plastic extruders and cranes along with the jackhammers and hose crimpers.

Here we have discussed how hydraulics help in accomplishing various day-to-day tasks across industries and sectors.


Hydraulics in Everyday Life

In the field of jobs performed by hydraulic machines, we may also include metal stamping and hose crimping, injection molding, and many more.


Entertainment - we can say here that spinning motors are a great source of entertainment in amusement parks. They apply hydraulics technology which is to power rides and then later provides motion, for instance, a Ferris wheel.


Vehicle Braking - Virtually all vehicles on the road are powered by hydraulics. Specifically, if we look at the brake fluid which is an important component of a vehicle’s braking system. The Pressing of the foot on the brake pedal forces a rod and piston which is within the master cylinder to move and achieve the desired effect which ideally involves slowing down or we can also say stopping the vehicle.


Lifting and Repair & Maintenance - As we know, without a hydraulic system it would be very difficult to lift a very heavy motor vehicle to facilitate repair and maintenance. The system generally uses hydraulic fluid to help lift any heavy load to the desired height.


Construction - The construction industry has greatly benefited from technological advancements due to hydraulics. 


Benefits of Solving important Questions

As students must be aware that Class 11 is the basis for Class 12 as well as for the entrance exams. Practice is one way to ensure that students secure good marks in their exams. Important questions are available to students online as well as in reference books. These important questions are curated by experts who are the finest in their field of the subject. These important questions are availed to students after thorough research on the latest ex patterns and previous year’s question paper. When students will attempt these questions and solve them, it will ensure students are preparing effectively for their exams. By solving these questions students will get conceptual clarity by chapters and will clear their doubts.  The set of important questions covers all crucial and necessary topics within a chapter. Going through important questions boosts up students’ confidence and there is a high stake that some of these questions might be asked in the examinations. Students can also refer to the CBSE Class 11 important questions to get a fair idea about the structure of the paper.


Students will enjoy the following benefits as they will solve more and more important questions:

  • As students will solve they will observe and understand the topics from which the questions are mostly asked. It will help students to frame more questions from those topics.

  • Solving important questions will give students a reality check about their speed while answering the questions and develop impressive time management skills for final exams.

  • Attempting these important questions is a good semi mock test to get acquainted with the difficulty level of questions and improve their problem-solving skills.

  • Increases students’ capability to understand and solve any type of question during the examinations.

FAQs on Hydraulic Machines

1. What is the principle of hydraulic machines?

A hydraulic press generally works on the principle of Pascal's law which states that when pressure is directly applied to a confined fluid. Then after that, the pressure change occurs throughout the entire fluid. Within the hydraulic press, we can say that there is a piston that works as a pump that provides a modest mechanical force to a small area of the sample.

2. What are the disadvantages of hydraulic systems?

There are several disadvantages of the hydraulic systems, one of which is that they can leak which makes them a mess, and the fluids which are present inside them are often caustic to paint and some seals. Another drawback that is compared here to machines using gears and shafts is any transmission of power which later results in some losses due to resistance of fluid flow through the piping process.

3. What are the two types of hydraulic systems?

Providing the force constant which is regardless of the speed is an advantage of the hydraulic system. Open-loop hydraulic systems and closed-loop hydraulic systems are the two types of hydraulic systems.

4. Explain the advantages of hydraulic systems.

The advantages that we can list of a hydraulic system include the ease and accuracy by which they can be controlled.  and we can then say that the large amounts of power that they can generate. In general, we can conclude that hydraulic systems use fewer moving parts than some mechanical and electrical systems.

5. What do you understand about Pascal's Law?

Pascal’s law can be explained as the external static pressure applied on a confined liquid being distributed or transmitted evenly throughout the liquid in all directions. The static pressure is what acts at right angles to any surface in contact with the fluid. It was also found by Pascal that the pressure at a point for a static fluid would be the same through that point in that fluid. Pascal’s law is also widely known as the principle of transmission of fluid pressure or Pascal’s principle. French mathematician Blaise Pascal stated Pascal’s law in the year 1653.

The formula of Pascal law: F=PA, where P is used to denote the pressure transmitted and F, denotes the applied force, here is the cross-sectional area.