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So go through the below sections and prepare well for the examination. Diesel cycle and Reciprocating internal combustion engine. Direct injection Diesel engines inject fuel directly into the cylinder. This is because the Diesel must operate at lower engine speeds. According to Diesel, this ignited the idea of creating a machine that could work on the Carnot cycle.
The petrol from tank to the automotive ergine is fed by a gravity b pump run by engine c suction pressure created by, suctio stroke d capillary action e fuel pump. The adiabatic expansion is in a higher pressure range than that of the compression because the gas in the cylinder is hotter during expansion than during compression. Diesel's idea was to compress the air so tightly that the temperature of the air would exceed that of combustion.
This means, that increasing either torque or time will result in an increase in power. Grundlagen Fahrzeug- und Motorentechnik.
Thermodynamik der Verbrennungskraftmaschine. If petrol is used in a diesel engine, then a higher knocking will occur b efficiency will be low c low power will be produced d black smoke will be produced e lot of fuel will remain unburnt.
Chemical energy is released and this constitutes an injection of thermal energy heat into the compressed gas. The thermal efficiency of a two cycle engine as compared to four cycle engine is a more b less c same d more upto some load and then less e it may be less or more depending on several other factors.
For military use and medium-size boats, medium-speed four-stroke Diesel engines are most suitable. In loop scavenging, the top of the piston is a flat b contoured c slanted d depressed e convex shaped. Adding an intercooler to a turbocharged engine further increases engine performance by cooling down the air-mass and thus allowing more air-mass per volume.
At the recent Frankfurt motor show, Siemens, Bosch and Delphi all launched piezoelectric fuel injection systems. Funktionsweise, Simulation, Messtechnik.
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The average Diesel engine has a poorer power-to-mass ratio than the Otto engine. In World War I, especially submarine Diesel engine development advanced quickly. Over the years many different injection methods have been used. Crain Communications, Inc.
An engine indicator is used to determine the following a speed b temperature c volume of cylinder d m. Large ships use extremely efficient, low-speed two-stroke Diesel engines. Theory and Construction of a Rational Heat Motor.
They were originally used as a more efficient replacement for stationary steam engines. Combustion in compression ignition engines is a homogeneous b heterogeneous c both a and b d laminar e turbulent. Critics have claimed that Diesel never invented a new motor and that the invention of the Diesel engine is fraud. This is because it will help you to complete those sections as fast as possible. Combustion occurs at a substantially constant pressure during the initial part of the power stroke.
Diesel sought out firms and factories that would build his engine. Gaseous-fuel guarantees are based on a calorific value of oil b low heat value of oil c high heat value of oil d mean heat value of oil e all of the above.
After the opening of the exhaust valve, the exhaust stroke follows, but this and the following induction stroke are not shown on the diagram. For gasoline engines, the actuators may include an intake throttle actuator, a loading device for the engine such as an induction motor. And, one more thing is you no need to search here and there for the syllabus.
As a result of detonation in an I. An electric motor powers the propeller. The timing is measured in degrees of crank angle of the piston before top dead centre.
It causes lung cancer and is associated with an increased risk for bladder cancer. Diesel engines have long been popular in bigger cars and have been used in smaller cars such as superminis in Europe since the s. In the Diesel engine, only air is initially introduced into the combustion chamber. This is called an air-blast injection.
Where is answers and can u update aptitude queations on mechanics and dynamics. Compact executive Executive Personal. Most high speed compression engines operate on a Diesel cycle b Otto cycle c Dual combustion cycle d Special type of air cycle e Carnot cycle. In addition to that, a single ship can use two smaller engines instead of one big engine, which increases the ship's safety.
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In general, Diesel engines do not require any starting aid. This high compression causes the temperature of the air to rise.
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The magneto in an automobile is basically c transformer b d. At about the top of the compression stroke, fuel is injected directly into the compressed air in the combustion chamber. The fuel then ignites due to compression heat. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio.
Common-Rail direct injection, combine all pdf to one pdf file turbocharging and four valves per cylinder are standard. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is a same b less c more d more or less depending on power rating e unpredictable. Several German manufacturers produced engines according to this standard. Diesel-electric transmission was not suitable for such small engines. Supercharging is essential in a diesel engines b gas turbines c petrol engines d aircraft engines e marine engines.
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