Steam Engine provided on steam locomotives is

Steam Engine provided on steam locomotives is

Right Answer is:

Double-acting non-condensing type


The steam engine is an external combustion engine in which steam is used as the working substance to convert the heat energy of steam into mechanical work. A steam engine is a reciprocating type of engine. In a steam engine, steam at high pressure and temperature is expanded to move the piston. The reciprocating motion of the piston is converted into rotary motion by a slider-crank mechanism. 

Classification of Steam Engine

Steam engines may be classified according to different criteria, as follows:

  1. The orientation of the axis of the cylinder:
    1. Vertical
    2. Horizontal
    3. Inclined.
  2. The direction of steam inlet: 
    1. Single-acting: In single-acting endues the steam is supplied on one side of the piston only. Thus, we get one power stroke and one idle stroke in each cycle.
    2.  Double-acting:-  In double-acting engines steam is supplied on one side of the piston during forward smoke and on its other side during the return stroke. Thus, we get two power strokes in each cycle.
  3. Number of cylinders:
    1. Simple steam engine:- In a simple steam engine the steam expands in one cylinder only
    2. Compound steam engine:- In the compound cylinder, steam is allowed to expand partly in one cylinder, and partly in second or third cylinders.
  4.  The exhaust of steam:
    1. Condensing:- In condensing engines, the steam coming out of the cylinder, after expansion, is sent to an enclosed chamber called a condenser. Inside the condenser, pressure is maintained below atmospheric pressure. Here, the steam is condensed by cooling water.
    2. Non-condensing:- In non-condensing engines, the steam is exhausted directly to the atmosphere. Condensing engines are more efficient, as more work output is obtained from the steam. e.g steam locomotive and steam wagon.
  5. Application: 
    1. Stationary:-Stationary engines are used in plants for the generation of mechanical or electrical power, and to drive pumps, shafts, machines, etc.
    2. Locomotive:- Locomotive engines are used in railroad applications.
    3. Marine:- Marine engines are used in ships.
  6. Speed:
    1. Low speed below 100 rpm
    2. Medium speed—100 to 300 rpm
    3. High speed above 300 rpm

Since it is difficult to install a condenser on a locomotive, the steam engine runs non-condensing and, therefore, has a very low thermal efficiency of about 6-8 percent. it has strictly limited overload capacity.

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