Correct Answer - Option 3 : Lancashire
According to the method of circulation of the water, boilers are classified
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Natural circulation: If the circulation of water takes place due to the difference in density caused by the temperature of the water, then it is called a natural circulation boiler.
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Forced circulation: If the circulation water takes place with the help of an external pump, then it is called a forced circulation boiler.
Boiler with the natural circulation of water
- Lancashire boiler
- Babcock-Wilcox boiler
- Cochran boiler
Boiler with forced circulation of water