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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
On Millier chart, the constant pressure lines

Diverge from right to left
Diverge from left to right
Are equally spaced throughout
First rise up and then fall

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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

Wet steam
None of these
Dry saturated steam
Superheated steam

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Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Provide support for boiler
Prevent flat surfaces under pressure from tearing apart
Take care of failure in compression
Take care of failure in shear

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Steam Boilers, Engines, Nozzles and Turbines
Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

I.P. = a × m + b
m = a + b × I.P.
m = (b/I.P.) - a
I.P. = b × m + a

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Steam Boilers, Engines, Nozzles and Turbines
In a throttling process

Steam entropy remains constant
Steam pressure remains constant
Steam temperature remains constant
Steam enthalpy remains constant

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler usually have _________ diameter.

72.5 mm
6.25 mm
62.5 mm
92.5 mm

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