· An axial compressor consists of a row of rotor blades followed by a row of stator blades and the working fluid traverses through these without significant change in radius change in radius. · The energy level of the fluid flowing through it is increased by the action of the rotor blades, which exert a torque on…
The carburettor is a device for atomising and vaporising the fuel and mixing it with the air in the varying proportions to suit the changing operating conditions of the engine. The process of breaking up and mixing the fuel with the air is called carburetion. Components of carburettors usually include a storage chamber for liquid fuel, a…
The control and movement of the lathe machines can be done with the help of computers. The function of the lathe machine actuated by the Computer Numerical Controls (CNC) is known as CNC lathe. Have a look at the figure for a clear idea – CNC Lathe Machine Parts Vice: Vice is actually like a clamp which holds…
A turbocharger or turbo is a forced induction device used to allow more power to be produced for an engine of a given size. A turbocharged engine can be more powerful and efficient than a naturally aspirated engine because the turbine forces more intake air, proportionately more fuel, into the combustion chamber than if atmospheric…
Spark plug is a device used to produce electric spark to ignite the compressed air fuel mixture inside the cylinder. The spark plug is screwed in the top of the cylinder so that it electrode project in the combustion chamber. SPARK PLUG Construction A spark plug comprises three main parts: the housing, insulator, and electrodes….
Achieving fuel-efficiency in Internal Combustion Engines (ICE) is crucial to operation. In order to efficiently burn fuel in an ICE, you need the correct air-fuel ratio. Internal combustion engines burn fuel to create kinetic energy. The burning of fuel is basically the reaction of fuel with oxygen in the air. The amount of oxygen present…
High frequency ultrasonic (sound) waves are applied to the test piece by a Piezoelectric crystal. If the test piece is free from cracks, or flawless, then it reflects ultrasonic waves without distortion. If there are any flaws in the specimen, the time taken by the ultrasonic waves will be less as the reflection of these waves will be from flaw points and not from the bottom of the specimen. Cathode ray oscilloscope (CRO) is used to receive the sound signals, whose time base circuit is connected to it. Knowing the time interval between the transmission of the sound pulse and the reception of the echo signal, we can calculate the depth of the crack. This test is a very fast method of inspection and often used to test aerospace components and automobiles. This test is generally used to detect internal cracks like shrinkage cavities, hot tears, zones of corrosion and non-metallic inclusions.
Boilers can be classified as follows: 1. According to the flow of water and hot gases – fire tube (or smoke tube) and water tube boilers. In fire tube boilers, hot gases pass through tubes which are surrounded with water. Examples: Vertical, Cochran, Lancashire and Locomotive boilers. There may be single tube as in case…
What is Simple Harmonic Motion (SHM)? Amplitude, Frequency and Periodic Time of a body moving with SHM? A body is said to move or vibrate with simple harmonic motion (briefly written as S.H.M.), if it satisfies the following two conditions: 1. Its acceleration is always directed towards the center known as point of reference or mean position, and…
Now we know all the constituents of a fire and various kinds of fire-extinguishers. If you have to fight a fire, depending on the circumstances, you have to decide as to what method/strategy (i.e. which arm to fight) you would like to use. Accordingly, you might want to choose an appropriate extinguisher. Lets look at some…