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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

100°C
40°C
60°C
0°C

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Steam Boilers, Engines, Nozzles and Turbines
The bituminous coal is no caking if its carbon content is

85-90%
81-85%
90-95%
78-81%

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Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Raising of steam temperature
Fouling of heat transfer surfaces
Higher effectiveness of boiler
High calorific value coal being burnt

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Steam Boilers, Engines, Nozzles and Turbines
In reaction turbines, the axial thrust is due to

Pressure drop across the rotor
Change in axial velocity
None of these
Both (A) and (B)

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Blading efficiency
Gross or stage efficiency
Nozzle efficiency
Mechanical efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The expansion of steam, as it flows over the blades in reaction turbine, represents

Isentropic process
Throttling process
Free expansion process
Isothermal process

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