Steam Boilers, Engines, Nozzles and Turbines
Locomotive type' boiler is

Vertical tubular fire tube type
Horizontal multi-tubular water tube boiler
Water wall enclosed furnace type
Horizontal multi-tubular fire tube type

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

The flames and hot gases pass through the tubes which are surrounded by water
None of these
Water passes through the tubes which are surrounded by flames and hot gases
Forced circulation takes place

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

Pressure drops and fluid flows through the nozzle
There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle
There is a pressure drop in the nozzle

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