What do you guys feel???

hi everyone,
I welcome you all
it's been a long time since had posted anything here.
today m not giving any insights about mechanical or engineering rather I feel like talking to you.
so what do you guys feel about the economy of India and USA due to the events that happened in recent past.
- demonetization in India
- Mr. Trump becoming president of USA
please leave your comments below stating your points of view.

Engine components

Reciprocating IC Engine look quiet simple but they are highly complex machines. There are two types of engines, viz., spark-ignition (SI) and compression ignition (CI) engine.

A cross section of single cylinder spark ignition engine with overhead valves is shown in figure.

EC & IC Engines

External combustion engines are those in which combustion takes place outside the engine whereas in internal combustion engines, combustion takes place within the engine.

For example:

In a steam engine or steam turbine, the heat generated due to the combustion of fuel is employed to generate high pressure steam which is used s a working fluid in a reciprocating engine or a turbine.

In case of gasoline or diesel engines, the product of combustion generated by combustion of fuel and air within the cylinder form the working fluid.

Classification of heat engine

Engines whether IC or EC are of two types, viz.,

• Rotary engine
• Reciprocating engine

A detailed classification is given in figure

Of the various types of heat engines, the most widely used ones are the reciprocating IC Engine, the gas turbine and the steam turbine.

ENGINE

An engine is a device which transforms one form of energy into another form. However, the efficiency of conversion plys an important role. Normally most of the engines covert thermal energy into mechanical work and therefore they are called 'heat engines'.

Heat engine is a device which transforms the chemical energy of a fuel into thermal energy and utilizes this energy to perform useful work.

Heat engines can be broadly classified into two categories:

• Internal combustion engines (IC Engines)
• External combustion engines (EC Engines)

FIRE EXTINGUISHER

Dry Powder Extinguishers

These extinguishers filled with dry powder may be of the gas pressure or stored air pressure type. They are suitable for use on both Type 2 and Type 3 kind of fires.

Foam Extinguishers

These are of two main types commonly called mechanical foam and chemical foam type of fire extinguishers. They are effective against Type 2 kind of fires.

Carbon Dioxide Type Fire Extinguishers

These are filled with the carbon dioxide. It is operated by means of a plunger, lever trigger or by opening a valve. It is fitted with a distinctively shaped discharge horn. This type of fire extinguisher has only limited effectiveness against Type 1 kind of fires but is suitable for extinguishing type 2 and 3 kinds of fires.

Water Filled Fire Extinguishers

The soda acid kind is the most common kind of water extinguishers. They are most suitable for extinguishing  fire for type 1.

Vaporizing Liquid Type Fire Extinguishers

They may be filled with either carbon tetrachloride (CTC.) or chlorobromethane (CBM). Where CTC kinds of extinguishers may be of the pump, gas cartridge or stored pressure type and CBM may be either gas cartridge or stored pressure. These extinguishers are most effective against electrical kind of fire (Type 3).

Stored Air Pressure Type Extinguishers

In stored air pressure type extinguishers, the container is pressurized with air when the extinguisher is filled. The extinguisher is trigger operated and operation can be stopped at any time by releasing the trigger grip. It is suitable for type 1 kind of fire only.

Gas Pressure Type Extinguishers

In gas pressure type extinguishers the water is expelled under pressure provided by carbon dioxide gas released from cartridge filled inside the container. It is suitable for Type 1 kind of fire.

TYPES OF FIRE

Type 1

 Fires occurring due burning of ordinary combustible materials such as wood, cloth and paper.  Pouring water is the most effective way for extinguishing this kind of fire.

Type 2 

Fires occurring due burning of flammable liquids such as oils, petrol, grease and fat. For extinguishing this kind of fire water must never be used, as it excludes oxygen.

Type 3 

Fires in this category involve live electrical equipment. The extinguishing agent must be non-conducting of electricity and water must never be used for extinguishing this kind of fire.