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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

Blow off cock
Fusible plug
Safety valve
Stop valve

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 hd K
V = 44.72 K hd
V = 44.72 K hd
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are

None of these
Internally fired
Externally fired
Internally as well as externally fired

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

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

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Steam Boilers, Engines, Nozzles and Turbines
An economiser is generally placed between

Air preheater and chimney
None of these
Induced draft fan and forced draft fan
Last superheater or reheater and air preheater

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Steam Boilers, Engines, Nozzles and Turbines
Clearance ratio is the ratio of

Swept volume to the clearance volume
Clearance volume to the volume at cut-off
Clearance volume to the swept volume
Volume at cut-off to the swept volume

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