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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Reduces back pressure of steam
All of these
Reduces temperature of exhaust steam
Increases expansion ratio of steam

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Steam Boilers, Engines, Nozzles and Turbines
Calorific value of coal is of the order of

800-1200 kcal/ kg
2000-4000 kcal/ kg
200-400 kcal/ kg
5000-8000 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The length of Cornish boiler is of the order of

24 m
79 m
35 m
57.5 m

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Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

176.5H/T1
88.25H/T1
T1 /88.25H
T1 /176.5H

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Steam Boilers, Engines, Nozzles and Turbines
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

Economiser
Steam condenser
Steam boiler
Steam preheater

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

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

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