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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
An economiser _________ the steam raising capacity of a boiler.

None of these
Has no effect on
Decreases
Increases

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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 right to left
Diverge from left to right
Are equally spaced throughout

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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

Choked
None of these
Under-damping
Over-damping

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

Tubes are laid vertically
Flue gases pass through tubes and water around it
Forced circulation takes place
Water passes through the tubes and flue gases around it

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Steam Boilers, Engines, Nozzles and Turbines
Reheating of steam in a turbine

Increases the efficiency of the turbine
All of these
Reduces wear on the blades
Increases the work-done through the turbine

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Steam Boilers, Engines, Nozzles and Turbines
In a uniflow engine

None of these
Steam enters at one end and exhausts at the centre
Steam enters at the centre and exhausts at the other end
Steam enters and exhausts through the same port

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