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4 stroke engine lab manual

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4 stroke engine lab manualIt is probably the first branch of engineering which has vast applications in all fields. Mechanical engineers were responsible for Industrial Revolution and innovations like the steam engine, internal combustion engines, turbines, compressors, pneumatic machines, machine tools, refrigeration and air conditioning systems, etc done by mechanical engineers. Therefore every student should know the basic of mechanical engineering. This lab manual is written with a purpose to bring in understanding of the basic concepts of mechanical engineering and develop as core professional. Download full-text PDF The most common application are s team rollers, pile drivers, steam shovels, portable hoisting rigs and certain other mobile applications. The boiler can also work as an oil fired unit by fitting an oil burner at fire door. The grate is then dispensed with and a linin g of fire bricks are provide d beneath the furnace. The furnace has no riveted seams exposed to flame and is pressed h ydraulically from one plate to finished shape. This makes the furnace suitable to resist the intense heat produced by the combustion of fuel. The coal, on burnin g, produces hot flue gases and these hot products of combustion from the fire box enter through the small flue pipe into the combustion chamber which is lined with fire bricks on the outer wall of the boiler. The dome shaped furnace and the combustion chamber prevent the loss which could otherwise occur because of combustion being retarded and much unburnt and combustible matter leaving the furnace. The unburnt fuel is deflected back to the grate and complete combustion is achieved in combustion chamber where high temperatures are maintained. The hot gases passing through the horizontal smoke tubes give their heat to the water and in doing so convert water into steam which gets accumul ated in the upper portion of the shell from where it can be supplied to the user. The flue tubes are generally of 62.5 mm. external dia.http://www.imagemarte.com.br/arquivos/bosch-maxx-7-sensitive-dryer-manual-filetype-pdf.xml

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And are 165 in number. The crown of the shell is made hemispherical in shape which gives the maximum space and strength for a certain weight of material in the form of plates. Finally the flue gases are discharged to the atmosphere through the smoke box and the chimney. It consists of a drum connected to a series of front end and rear end header by short riser tubes. To these headers are connected a series of inclined water tubes of solid drawn mild steel. The inclination of tubes to the horizontal is about 15 degree or more. A feed valve is provided to fill the drum and level of water indicates by water level indicator. Fire is bu rnt on the grate. The hot gases are forced to move upwards between the tubes by baffle plates provided. The steam then enters through the anti -priming pipe and flows in the super heater tubes where it is further heated and is finally taken out through the main stop valve and supplied t o the engine when needed. In the cross drum there is no limitation of the number of connecting tubes. In case of cross drum: Pressure --------------------------100 bar First categories include the fitti ngs which are primarily indicated for the safety of the boiler and for complete control of the process of steam generation. These units are called mountings. The mounting from an int egral part of the boiler and are mounted on the body of the boiler itself. The following mountings are usually installed on the boiler. 1. Two safety va lve 2. Two water level indicators 3. Pressure gauge 4. Fusible plug 5. Steam stop valve 6. Feed check valve 7. Blow- of cock 8. Man and mud hole Second categories include the components which are installed to increase the efficiency of the steam power plants and help in the proper working of the boiler unit. These fitting are called boiler accessories. The following accessories are given below. 1. Air pre-heater 2. Economiser 3. Super heater 4. Feed pump and 5.http://e-cluny.cz/UserFiles/bosch-maxx-7-tumble-dryer-manual.xml Injector FUNCTION, LOCATION AND WORKING OF MOUNTINGS AND ACCESSORIES:- A) SAFETY VALVE:- The func tion of the safety valve is to permit th e steam in the boiler to escape to atmosphere when pressure in the steam space in the boiler. The safety valve operates in the principle that a valve is pressed against its seat through some agency such as sturt, screw or spring by external weight or force.The commonly used safety valves are given below:- i) Dead weight safety valve ii) Lever safety valve iii) Spring loaded safety valve iv) High steam- low water safety valve B) WATER LEVEL INDICATOR:- The function of the wa ter level indicator is to ascertain constantly and ex actly the level of water in the boiler shell. It is fitted in the front of the boiler from where it is easily visible to the operator. The flanges are bolted to front end plate of the boiler, the upper flange being fitted to the steam space and the lower to water space in the boiler. There are two cocks namel y steam cock and water cock which communicate the boiler shell spaces to the gauge glass tube. When the handle of the cocks are vertical, they are in operation and the water level in the tube corresponds to water level in the shell. A red mark on the glass tube indicates the safe water level. C) FUSIBLE PLUG:- The function of the fusible plug is to extinguish the fire in the event of the boiler shell falling below a certain specified limit. We known that when the water on heating transforms into steam, the level of water in the boiler falls down. If the water is not replenished and the steam generation continues then the parts, which have been uncovered b y water uncovered b y water may get overheated and subsequently are melted. To safeguard against this eventuality we use fusible plug. The fusible plug is inserted at the box crown or over the combust ion chamber at the lowest permissible water level.http://www.drupalitalia.org/node/75993 D) PRESSURE GAUGE:- Each boiler has to be provided with a pressure gauge, whi ch record the pressure at which the steam is being generated in the boiler. The gauge is usually mounted at the front top of the boiler shell or drum. The gauge has to be clearly visible to the attendant so that he can easily record the pressure reading. E) BLOW OFF COCK:- The blow of cock serves to drain out the water from the boiler periodically for any one of the following reasons:- 1) To discharge mud, sc ale and other impurities which settle down at the bottom of the boiler? 2) To empty the boiler for internal cleaning and inspection. 3) To lower the water level rapidly if the level becomes too hig h. The unit is fitted at the lowest portion of the boiler. It ma y be mounted directly to the boiler shell or through an boiler elbow pipe, which is fitted to the boiler shell. F) FEED CHECK VALVE:- The feed check valve has the following two functions to perform:- 1. To allow the feed water to pass into the boiler. 2. To prevent the back flow of water from the boiler in the events of the failure of the feed pump. G) STOP VALVE:- The function of the steam stop valve is to shut off or regulate the flow of steam from the boiler to the steam pipe or from the steam pipe to the engine. When used for the former purpose, it is called junction valve. Usually the junction valve means a regulating valve of lar ger size and a stop valve refers to a regulating valve of smaller size. The junction valve is mounted on the highest part of the steam space of the boiler and is connected to the steam pipe, which carries the steam to the engine. H) MAN HOLES:- These are door to allow men to enter inside the boiler for the inspection and repair. I) AIR HEATER:- Air heater or air pre-heater are waste heat recovery device in which the air on its way to the furnace is raised in temperature by utiliz ing the heat of the exhaust gases. Air pr e-heater are classified into the following two categories. ?https://absagencies.com/images/4-stroke-engine-service-repair-manual.pdf Recuperative Air heater. Regenerative Air heater The heat thus recovered is utilized in raised temperature in feed water being supplied to the boiler. If the water at raised and thus there is a saving in the consumption of fuel. The economiser unit is installed in the path of the flue gasses between the boiler and the chimney. K) STEAM SUPER HEATER:- The steam generated by a simple boiler in generally wet or at the most dry saturated. S team super heater is a surface heat ex changer in which the w et steam is first dried at the same temperature and pressure and then raised to temperature above the saturation temperature at constant pressure. Heat of flue gasses utilized in super heating the steam and as t he super heater is placed in the path of the flue gasses. Since superheating result in the increased efficiency and economy of the steam plant. L) FEED WATE R EQUIPMENT: - Th e pressure inside a steaming boiler is high and so th e feed water has to be raised in pressure before its entry can be affected in the boiler. Feed pump is a device which raised the pressure of water and forces it into the boiler.Both the inlet and exhaust valves remain closed during the stroke. C. EXPANSION ST ROKE: - When the fuel is ignited by the spark plu g t he hot gases are produced which drive or through the piston from T.D.C to B.D.C and thus the work is obtained in thi s stroke. Both the valves remain closed during the start of this stroke but when the piston just reaches the B.D.C the exhaust valve opens. D. EXHAUST STROKE:- This is the last stroke of the cycle. Here the gases from which the work has been collected become useless after the completion of the expansion stroke and are made to escape through exhaust valve to the atmosphere. This removed of gas is accomplished durin g this stroke. The piston moves from B.D.C to T.D.C and the ex haust gases are driven out of the engine cylinder. This is also called scavenging. This is represented by the line (1 -5). WORKING PROCESS OF TWO STROKE DIESEL ENGINE: In two stroke engine, the working cycle is com pleted into two stroke of the piston or one revolution of crankshaft. In figure shows a two s troke diesel engine the cylinder L is connected to a closed crank chamber.It may be noted that the incoming air helps the removal of gases from the engine cylinder. The piston then again starts moving from B.D.C to T.D.C and the charge gets compressed when E.P and T.P are covered by the piston, thus the cycle is repeated. VIVA-QUESTIONS:- ? What is scavenging? ? Why the piston of a two stroke engine is made deflector type? ? What is the ratio between speed of crankshaft to the speed of a camshaft? ? How is an I.C. engine started? ? What is supercharging.Both the inlet and exhaust valves remain closed during the stroke. C. EXPANSION ST ROKE: - When the mixture is ignited by the spark plug the hot gases are produced which drive or through the piston from T.D.C to B.D.C and thus the work is obtained in this stroke. Both the valves remain closed during the start of this stroke but when the piston just reaches the B.D.C the exhaust valve opens. D. EXHAUST STROKE:- This is the last stroke of the cycle. Here the gases from which the work has been collected become useless after the completion of the expansion stroke and are made to escape through ex haust valve to the atmosphere. This removed of gas is accomplished durin g this stroke. The piston moves from B.D.C to T.D.C and the ex haust gases are driven out of the engine cylinder. This is also called scavenging. This is represented by the line (1 -5). WORKING PROCESS OF TWO STROKE PETROL ENGINE: In two stroke engine, the working cycle is completed into two stroke of the piston or one revolution of crankshaft. In figure shows a two stroke petrol engine the cy linder L is connected to a closed crank chamber.It may be noted that the incoming air petrol mixture helps the removal of gases from the engine cylinder, if in case these exhaust gases do not leave the cy linder the fresh charge gets diluted and efficiency of the engine will decreases. The piston then again starts moving from B.D.C to T.D.C and the charge g ets compressed when E.P and T.P are covered b y the piston, thus the cycle is repeated. VIVA-QUESTIONS:- (i) What is scavenging? (ii) Why the piston of a two stroke engine is made deflector type? (iii) What is the ratio between speed of crankshaft to the speed of a camshaft? (iv) How is an I.C. engine started? (v) What is supercharging.APPARATUS USED:- Worm and Worm wheel, rope and weight. CONSTRUCTION AND THE ORY:- It consists of a square threaded scre w, S (known as worm) and a toothed wheel(known as worm wheel )geared with each other, as shown in the figure A. Wheel A is attached to the worm, over which passes a rope. Some times a handle is also fixed to the worm (instead of the wheel). A load drum is securely mounted on the worm wheel.APPARATUS:- Single and double purchase winch crab, measuring instruments, weights, string and hanger. These are classified as: 1. Single purchase Winch crab. 2. Double purchase Winch Crab Single Purchase Winch Crab:- It consists of two parallel spindles, upper one called effort spindle and lower one is called as load spindle. One effort spindle a small touched wheel pinion is mounted in such a way that pinion and a leve r is attached to appl y the effort. On load spindle, a large toothed wheel known as spur wheel is mounted in such a way that pinion meshes with it. Both the spindles are suitably mounted on a rigid frame. Other arrangements are similar to that of single purchase winch crab.Count the number of teeth of the pinion A and spur gear B. ? Measure the circumference of pulley and of load drum with a string and meter rod or measure the dia.APPARATUS USED:- Apparatus of simply supported beam. THEORY:- BEAM:- It is a structural member on which the load act pe rpendicular to axis. It is that whenever a horizontal beam is loaded with vertical loads, sometimes it bends due to the action of the loads. The amounts by which a beam bends, depends upon the amount and types of loads, length of beam, elasticity of th e beam and the type of beam. In general beams are classified as under: 1. Cantilever beam:- It is a beam whose one end is fixed to a rigid support and the other end is free to move. 2. Simply supported beam:- A beam supported or resting freely on the walls or columns at its both ends is known as simply supported be am. 3. Rigidly fixed or built-in beam:- A beam whose both the ends are rigidly fixed or built in walls is called a fixed beam. 4. Continuous beam:- A beam support on more than two supports is known as a continuous beam. It may be noted that a continuous beam may not be overhanging beam. TYPES OF LOADING: 1. Concentrated or point load:- A load acting at a point on a beam is know n as concentrated or a point load. 2. Uniformly distributed load:- A load, which is spread over a beam in such a manner that each unit length is loaded to a same extent. 3. Uniformly varying load:- A load, which is spread over a beam, in such a manner that its extent varies uniformly on each unit leng th. SHEAR FORCE:- The shear force at the cross-section of a beam may be defined as the unbalanced vertical forces to the right or left of the section. IMPORTANT POINTS:- 1. If loading is uniformly distributed load then shear force diagram will be a curve of first degree and B.M. diagram will be a curve of second degree. 2. If the loading is point load then its corresponding S.F. diagram would be a curve of zero degree and the B.M. diagram would be a curve of first degree. 3. If the loading is uniformly varying load its S.F. diagram would be curve of second degree and BMD will be of third degree. 4. Bending moment is maximum where shear force is zero. 5. In case of simply supported beam the first step is to calculate the reactions at the support, then we proceed in usual manner. 6. In case of cantilever beam there is no need of finding reaction and start from the free end of the beam. 7. Point of flexural is the where BM changes its si gn. 8. B.M. at the support is zero for simply supported beam. Example:- A simply supported beam 4m.The loads are usually centrally loaded upon it. Screw jacks of three types: 1. Simple screw jack 2. Compound Screw jack 3. Differential Screw jack A simple screw jack consists of a nut, a screw square threaded and a handl e fitted to the head of the screw. The nut also forms the body of the jack. The load to be lifted is placed on the head of the screw. Here the axial distance between corresponding points on two consecutive threads is known as pitch. OBSERVATION:- For single Screw Jack: S.No. Load (W) in Nt. Effort (P) in Nt. Length of lever Pitch of screw V.R. M.A. Efficiency COMPOUND SCREW JACK:- It is a further improved from of differential screw jack, in which the velocity ratio is further intensified with the help of a geared screw jack, i n which the screw is lifted with the help of worm and worm wheel, inst ead of effort at the end of a lever. Now consider a worm geared screw jack. APPARATUS USED: - Models of dynamometer. THEORY:- The dynamometer is a device used to measure the torque being exerted along a rotating shaft so as to determine the shaft power. Dynamometers are generally classified into: 1) Absorption dynamometers (i.e. Prony brakes, h ydraulic or fluid friction brakes, fan brake and eddy current dynamometers) 2) Transmission d ynamometers (i.e. Torsion and belt dynamometers, and strain gauge dynamometer) 3) Driving dynamometers (i.e. Electric cradled dynamometer) PRONY BRAKE: - The prony and the rope brakes are the two types of mechanical brakes chiefly employed for power measurement. The prony brake has two common arrangements in the block type and the band type. Blo ck type is employed to high speed shaft and band type measures the power of low speed sh aft. BLOCK TYPE PRONY BRAKE DYNAMOMETER: - The block type prony brake consists of two blocks of wood of which embraces rather less than one half of the pulley rim. One block carries a lever arm to the end of which a pull can be applied by means of a dead weight or spring balance. A second arm projects from the block in the opposite direction and carries a counter weight to balance the brake when unloaded. When operating, friction between the blocks and the pulley tends to rotate the blocks in the direction of the rotation of the shaft. This tendency is prevented by adding weights at the extremity of the lever arm so that it remains horizontal in a position of equilibrium.The frictional grip b etween the band the brake drum can be adjusted by tightening or loosening the clamp. The torque is transmitted to the knife edge through the torque arm. The knife edge rests on a platform or communicates with a spring balance. The ropes are spaced evenly across the width of the rim by flywheel. The upward ends of the rope are connected together and attached to a spring balance, and the downwar d ends are kept in place by a dead weight. The rot ation of flywheel produces frictional force and the rope tightens. Consequently a force is induced in the spring balance. The unit consists essentially of two elements namely a rotating disk and a stationary casing. The rotating disk is keyed to the driving shaft of the prime-mover and it revolves inside the stationary casing. When the brake is operating, the water follows a helical path in the chamber. Vortices and eddy- This tendency is resisted by the brake arm and balance system that measure the torque.VIVA-QUESTIONS:- (vi) How many types of method of shaft power measurement ? (vii) How many types of mechanical brakes ? (viii) Which ty pe mechanical brake use for high speed and low speed shaft ? (ix) What is mean by effective radius of the brake d rum? (x) Which types of bearing is same as the friction torque transmitted by a disc or plate clutch? THEORY:- A hydraulic turbine uses the potential and kinetic energy of w ater and conv erts it into usable mechanical energy. The fluid energy is available in the nature or artificial high level water reservoirs which are created by cons tructing dams at appropriate places in the flow path of rivers. W hen water from the reservoir is taken to the turbine, transfer of energy takes place in the blade passages of the unit.Smooth running and good performance are other common features of this unit. Component Parts: i) Penstock ii) Spear and nozzle iii) Runner with buckets iv) Casing Governing mechanism FRANCIS TURBINE:- Francis turbine is an inward flow reaction turbine which was designed and developed by the American engineer James B. Francis (1815-1892). In the earlier stages of its development, Francis turbine had a purely radial flow runner; the flow passing through the runn er had velocity component only in a plane normal to the axis of the runner. The modern Francis turbine is, however, a mixed flow unit in which the water enters the runner radially at its outer periphery and leaves axially at its centre. Component Parts: i) Penstock ii) Scroll casing iii) Guide vanes or wicket gates The unit is like the propeller of a ship operating in r everse. The ship propeller rotates, thrusts the water away behind it and thus causes the ship to move forward. In a p ropeller turbine, the water flows through the propeller and sets it in motion. Water enter the turbine laterally, gets deflected b y the guide vanes and the flows through the propeller. For this reason, these machines are referred to as axial flow units. Component Parts: i) Scroll casing ii) Stay ring iii) Guide mechanism iv) Draft tube APPLICATIONS:- i) In thermal power plans.VIVA-QUESTIONS:- (xi) What are different types of steam nozzles used in impulse turbine.Tensile test can be conducted on UTM. A material when subjected to a tensile load resists the applied load by developing internal resisting force. These resistances come due to atomic bonding between atoms of the material. The resisting force for unit normal cross-section area is known as stress. The value of stress in material goes on increasing with an increase in applied tensile load, but it has a certain maximum (finite) limit too. The minimum stress, at which a material fails, is called ultimate tensile strength. The end of elastic li mit is indicated by the yield point (load). This can be sen during experiment as explained later in procedure with increase in loading bey ond elastic limit original cross-section area (Ao) goes on decreasing and finall y reduces to it s minimum value when the specimen breaks. It is hydraulically operates a pump, oil in oil sump, load dial indicator and central buttons. The left has upper, middle and lower cross heads i. e; specimen grips (or jaws). Idle cross head can be moved up and down fo r adjustment. The pipes connecting the lift a nd right parts are oil pipes through which the pumped oil under pressure flows on left parts to more the cross-heads. How much is its elongation ? ResearchGate has not been able to resolve any references for this publication. Read more Article Pneumatic Loom for Leno Weaves with Rotary Mechanism Forming the Shed and Beating-up the Weft January 2006 Kazimierz Kopias Zbigniew Kossowski We present herein a genuinely new concept for a rotary mechanism for pneumatic looms, which forms the shed and beating-up the weft, together with an electromagnetic device to drive the guide needle bar. The mechanism and device which we designed and constructed were tested using a model loom. Scaling is discussed and equipment and procedures are described. A study is made of the process mechanisms and the influence of steam rate and initial oil saturation, and compared performance of single and multiple patterns. If the steam rate is high enough, no gravity override occurs, and much for the formation is swept layer by layer, resulting in high recovery of oil. Acoustic emission, torque, and temperature were measured during experiments. Optical microstructure was observed for the wear processing after every 10 minute sliding at rotation speed of 1750 rpm and scanning electron microscopy was also observed. Except for the initial part of every experiment, the variation of acoustic emission was well coincided with torque variation during the experiments. This study concludes that acoustic emission and torque are proper monitoring parameters for the failure of mechanical seals. The intensity of acoustic emission signals is measured in root mean square voltage. Temperature of sealing face will be used as a parallel parameter for increasing the reliability of monitoring system. Read more Conference Paper Full-text available FRACTURE TOUGHNESS OF HDPE EVALUATED BY FATIGUE AND NOTCH PRECRACKING July 2015 Luis Fernando Iglesias Thais Sequeira Marysilvia Ferreira da Costa Celio Albano da Costa Neto The present study compares the fracture toughness properties of high density polyethylene (HDPE) when the precrack was opened by razor blade and by fatigue. Razor blades were prepared with two different radius of curvature, while the fatigue precracking had the radius of curvature close to zero, as demanded by fracture mechanics concept. This discrepancy confirms that fatigue precracking showed a much lower value for fracture toughness than the razor blade notch opening. It is also proposed that fatigue precracking in polymers should be further investigated as a regular procedure to be included in standards. Fractography investigation was realized and micro mechanisms of precrack opening methods were discussed. View full-text Discover more Download citation What type of file do you want. RIS BibTeX Plain Text What do you want to download. Citation only Citation and abstract Download ResearchGate iOS App Get it from the App Store now. Install Keep up with your stats and more Access scientific knowledge from anywhere or Discover by subject area Recruit researchers Join for free Login Email Tip: Most researchers use their institutional email address as their ResearchGate login Password Forgot password. Keep me logged in Log in or Continue with LinkedIn Continue with Google Welcome back. Keep me logged in Log in or Continue with LinkedIn Continue with Google No account. All rights reserved. Terms Privacy Copyright Imprint. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with I C Engine Lab Manual. To get started finding I C Engine Lab Manual, you are right to find our website which has a comprehensive collection of manuals listed. Our library is the biggest of these that have literally hundreds of thousands of different products represented. I get my most wanted eBook Many thanks If there is a survey it only takes 5 minutes, try any survey which works for you. Since ignition in these engines is due to a spark, therefore they are also called spark ignition engines. Thus the piston moves from top dead centre (T.D.C.) to bottom dead centre (B.D.C.). The exhaust valve remains closed through out the stroke. The piston moves towards (T.D.C.) and compresses the enclosed fuel-air mixture drawn. Just before the end of this stroke the operating plug initiates a spark which ignites the mixture and combustion takes place at constant pressure. When the mixture is ignited by the spark plug the hot gases are produced which drive or throw the piston from T.D.C. to B.D.C. and thus the work is obtained in this stroke. Here the gases from which the work has been collected become useless after the completion of the expansion stroke and are made to escape through exhaust valve to the atmosphere. This removal of gas is accomplished during this stroke. The piston moves from B.D.C. to T.D.C. and the exhaust gases are driven out of the engine cylinder; this is also called SCAVENGING. This operation is represented by the line 5-1 This operation is represented by 1-2 The fuel is injected at the end of compression stroke but in actual practice the ignition of the fuel starts before the end of the compression stroke. The hot gases of the cylinder expand adiabatically to point 4. Thus doing work on the piston. When the piston reaches the T.D.C. the exhaust valve closes and the cycle is completed. This stroke is represented by the line 1-5. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. You can download the paper by clicking the button above. Your browser either doesn't support Javascript or you have disabled it. To see this website correctly, please use a browser with Javascript enabled.Some of the experiments which are performed by under-graduate students are performance studies of both C.I. and S.I. engines, etc. Moreover studeis on the glorific values, exhaust gas characteristics, extensive studies of bio-diesel with both engines are done by post-graduate students in their respective project works. And besides the laboratory classes, the determination of calorific value for different fuels are done by some consultancy in this laboratory.Airbox with orificemeter and manometer Fuel tank: 20 lit capacity with metering column, Rotameter for water flow measurement Temperature indicator: PT-100 type temperature sensors. (3 points) Overall size 2m L x 2.5m W x 1.5m H. Weight 300kg approx.These signals are interfaced with computer through engine indicator for p?,The setup enables study of diesel engine for indicated power, brake power,These signals are interfaced with computer through engine indicator for p?,The setup enables study of diesel engine for indicated power, brake power.