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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The diameter of fire tubes in Cochran boiler is of the order of

12 cm
8 cm
2 cm
6 cm

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of fire tube of Cornish boiler compared to its shell is

One fifth
One half
One third
One fourth

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

Blading efficiency
Nozzle efficiency
Mechanical efficiency
Stage efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = 0.5 V² cosα
Vb = 0.5 V cosα
Vb = V cos α
Vb = V² cos α

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Steam Boilers, Engines, Nozzles and Turbines
The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

Chimney draught
Forced steam jet draught
None of these
Induced steam jet draught

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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 boiler
Steam condenser
Steam preheater

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