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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The basic job of feed water treatment in boilers is to overcome the problem of

Corrosion
Carryover
Scale
All of these

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Steam Boilers, Engines, Nozzles and Turbines
A wet vapor can be completely specified by

Pressure only
Temperature only
Pressure and dryness fraction
Dryness fraction only

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is

Stationary fire tube boiler
Internally fired boiler
All of these
Horizontal boiler

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Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Over-damping
Choked
None of these
Under-damping

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of well maintained boiler will be of the order

0.4
0.5
0.9
0.75

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of internal flue tubes of a Lancashire boiler is about ___ that of its shell.

One-fourth
Two-fifth
One-third
One-half

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