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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

165
115
75
225

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are those in which

Flue gases pass through tubes and water around it
Work is done during adiabatic expansion
Water passes through the tubes and flue gases around it
Change in enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
The flow of steam is supersonic

In the convergent portion of the nozzle
At the entrance to the nozzle
At the throat of the nozzle
In the divergent portion of the nozzle

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine, steam expands

None of these
Partly in the nozzle and partly in blades
Wholly in nozzle
Wholly in blades

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse reaction turbine, the pressure drops gradually and continuously over

Fixed blades
Moving blades
None of these
Both fixed and moving blades

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Steam Boilers, Engines, Nozzles and Turbines
If the critical pressure ratio for steam is 0.546, then the steam is initially

Superheated steam
Wet steam
None of these
Dry saturated steam

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