dc motor has poles, which are excited by dc current to produce magnetic fields.
-In the neutral zone, in the middle between the poles, commutating poles are placed to reduce
sparking of the commutator. The commutating poles are supplied by dc current.
-Compensating windings are mounted on the main poles. These short-circuited windings damp rotor
oscillations
-The poles are mounted on an iron core that provides a closed magnetic circuit.
-The motor housing supports the iron core, the brushes and the bearings.
-The rotor has a ring-shaped laminated iron core with slots.
-Coils with s..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 01:24:39 PM
Last Edited Or Replied at :Saturday 08th of January 2011 11:37:30 PM
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ion cycle, at which the valves are set to open and close. Since the valves require a finite period
of time in which to open or close without abruptness, a slight lead-time is always necessary for
proper operation. The design of the valve-operating cam provides for the smooth transition from one
position to the other, while the cam setting determines the timing of the valve.
In a typical four-stroke engine, the inlet valve is set to open before TDC (top dead centre),
towards the end of the exhaust stroke and close after BDC (bottom dead centre), at the start of the
compression stroke. While ..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 01:19:37 PM
Last Edited Or Replied at :Friday 22nd of April 2011 03:55:23 PM
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evice for both collecting and storing solar energy. Among the many type of solar ponds, the salt
gradient non convecting solar pond is becoming popular.
The paper reviews the basic principle of solar ponds, its construction, working and the problems
encountered in its operation. Some aspects of heat extraction from solar pond and its application
have also been discussed. Solar pond technology has made considerable progress in the last fifteen
years. The salinity gradient solar ponds are found to be more popular for collecting and storing
solar energy. This device is found to be cost effect..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 01:04:34 PM
Last Edited Or Replied at :Monday 28th of September 2009 09:21:35 AM
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will need to be fitted in diesel vehicles to comply with the PM standard...................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 01:03:10 PM
Last Edited Or Replied at :Sunday 25th of December 2011 11:32:58 PM
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ch are rated at 85% efficiency, but often attaining efficiencies of over 90%. A Diesel-powered
vehicle with a filter installed will emit no visible smoke from its exhaust pipe.
In addition to collecting the particulate, a method must be designed to get rid of it. Some filters
are single use (disposable), while others are designed to burn off the accumulated particulate,
either through the use of a catalyst (passive), or through an active technology, such as a fuel
burner which heats the filter to soot combustion temperatures, or through engine modifications (the
engine is set to run a certa..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:58:04 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:58:04 PM
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larger valves and higher pressure applications.
Another type of bonnet construction in a gate valve is..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:57:34 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:57:34 PM
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you 'see' the valve's position.
Ball valves are durable and usually work to achieve perfect shutoff even after years of disuse. They
are therefore an excellent choice for shutoff applications (and are often preferred to globe valves
and gate valves for this purpose). They do not offer the fine control that may be necessary in
throttling applications but are sometimes used for this purpose.
The body of ball valves may be made of metal, ceramic, or plastic. The ball may be chrome plated to
make it more durable.
There are three general types of ball valves: full port, standard port, and..................[:=> Show Contents <=:]
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Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:55:43 PM
Last Edited Or Replied at :Saturday 26th of June 2010 09:03:19 AM
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is a variant of fuel injection employed in modern four stroke petrol engines. The gasoline or
biobutanol is injected right into the combustion chamber of each cylinder, as opposed to
conventional multi point fuel injection that happens in the intake manifold.
GDI enables stratified charge (ultra lean burn) combustion for improved fuel efficiency and emission
levels at low load. Further improving efficiency and high-load output-power, the engine power is
governed by modulating fuel injection, like a diesel engine; as opposed to restricting intake
airflow, like a conventional gas internal com..................[:=> Show Contents <=:]
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