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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The Parsons' reaction turbine has

Only moving blades
Identical fixed and moving blades
Fixed and moving blades of different shape
Only fixed blades

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

V = 2g/H'
V = 2gH'
V = H'/2g
V = 2g H'

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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
The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

Boiler efficiency
Equivalent evaporation
Power of a boiler
Factor of evaporation

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

Pressure and dryness fraction
Temperature only
Pressure only
Dryness fraction only

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Steam Boilers, Engines, Nozzles and Turbines
At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is

Depends on temperature also
Zero
Minimum
Maximum

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