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What is Engine? What are the Main Types of it ?

What is Engine? What are Main Types of Engine?

    Any device which can convert heat energy of fuel into mechanical energy is known as engine or heat engine. Engine is widely used in automobile industries or we can say that engine is the heart of an automobile. Basically engine may be classified into two types.
    1. External combustion (E.C.) Engine
    2. Internal Combustion (I.C.) Engine


    Types of Engine:
     
    1. External combustion (E.C.) Engine
     
    It is an engine in which combustion of fuel take place outside of the engine. In this type of engine heat, which is generated by burning of fuel is use to convert the water or other low boiling temperature fluid into steam. This high pressure steam used to rotate a turbine. In this engine we can use all solid, liquid and gases fuel. These engines are generally used in driving locomotive, ships, generation of electric power etc.
     
    Advantages of E.C. engine-
     
    • In these engines starting torque is generally high.
    • Because of external combustion we can use cheaper fuels as well as solid fuel.
    • They are more flexible compare to internal combustion engines.

     
    2. Internal Combustion (I.C.) Engine
     
    It is an engine in which combustion of fuel take place inside the engine. When the fuel burns inside the engine cylinder, it generates a high temperature and pressure. This high pressure force is exerted on the piston (A device which free to moves inside the cylinder and transmit the pressure force to crank by use of connecting rod), which used to rotate the wheels of vehicle. In these engines we can use only gases and high volatile fuel like petrol, diesel. These engines are generally used in automobile industries, generation of electric power etc.
     
    Advantages of I.C. engine-
     
    • It has overall high efficiency over E.C. engine.
    • These engines are compact and required less space.
    • Initial cost of I.C. engine is lower than E.C. engine.
    • This engine easily starts in cold because of it uses high volatile fuel.

    Types of I.C. Engine:


    I.C. engine is widely used in automobile industries so it is also known as automobile engine. An automobile engine may be classified in many manners. Today I am going to tell you some important classification of an automobile engine.
     
    According to number of stroke:
     
    1. Two Stroke Engine
     
    In a two stroke engine a piston moves one time up and down inside the cylinder and complete one crankshaft revolution during single time of fuel burn. This type of engine has high torque compare to four stroke engine. These are generally used in scooters, pumping sets etc.
     
    2 Four Stroke Engine .
     
    In a four stroke engine piston moves two times up and down inside the cylinder and complete two crankshaft revolutions during single time of fuel burn. This type of engines has high average compare to two stroke engine. These are generally used in bikes, cars, truck etc.
     
    According to design of engine:
     
    1. Reciprocating engine (piston engine)
     
    In reciprocating engine the pressure force generate by combustion of fuel exerted on the piston (A device which free to move in reciprocation inside the cylinder). So the piston starts reciprocating motion (too and fro motion).  This reciprocating motion converts into rotary motion by use of crank shaft. So the crank shaft starts to rotate and rotate the wheels of vehicle. These are generally used in all automobile.
     
    2. Rotary engine (Wankel engine)
     
    In rotary engine there is a rotor which frees to rotate. The pressure force generate by burning of fuel is exerted on this rotor so the rotor rotate and starts to rotate the wheels of vehicle. This engine is developed by Wankel in 1957. This engine is not used in automobile in present days.
     
    According to fuel used:
     
    1. Diesel engine
     
    These engines use diesel as the fuel. These are used in trucks, buses, cars etc.
     
    2. Petrol engine
     
    These engines use petrol as the fuel. These are used in bikes, sport cars, luxury cars etc.
     
    3. Gas engine
     
    These engines use CNG and LPG as the fuel. These are used in some light motor vehicles.
     
    4. Electric engine
     
    It is eco-friendly engine. It doesn’t use any fuel to burn. It uses electric energy to rotate wheel.
     
    According to method of ignition:
     
    1. Compression ignition engine
     
    In these types of engines, there is no extra equipment to burn the fuel. In these engines burning of fuel starts due to temperature rise during compression of air. So it is known as compression ignition engine.
     
    2. Spark ignition engine
     
    In these types of engines, ignition of fuel start by the spark, generate inside the cylinder by some extra equipment. So it is known as spark ignition engine.
     
    According to number of cylinder:
     
    1. Single cylinder engine
     
    In this type of engines have only one cylinder and one piston connected to the crank shaft.
     
    2. Multi-cylinder engine
     
    In this type of engines have more than one cylinder and piston connected to the crank shaft.

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    A. hobbing .
    B. shaping with pinion cutter .
    C. shaping with rack cutter .
    D. Milling .

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    What is the most suitable bearing for carrying very heacy loads with slow speeds ?

    What is the most suitable bearing for carrying very heacy loads with slow speeds ?


    - (A) Hydrodynamic bearing.
    - (B) Ball bearing.
    - (C) Roller bearing.
    - (D) Hydrostatic bearing.


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