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

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [(n + 1)/2] n - (1/n)

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Steam Boilers, Engines, Nozzles and Turbines
The friction present between the steam and the nozzle surfaces reduces the heat drop by

25 to 40%
10 to 15%
40 to 60%
15 to 25%

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Steam Boilers, Engines, Nozzles and Turbines
Clearance ratio is the ratio of

Clearance volume to the swept volume
Clearance volume to the volume at cut-off
Swept volume to the clearance volume
Volume at cut-off to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

None of these
Gross efficiency
Diagram efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The three "Ts" for good combustion are

Temperature, time, and turbulence
Thorough mixing, total air and temperature
Total air, true fuel, and turbulence
Total air, time, and temperature

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