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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The value of diagram factor depends upon

Back pressure
Initial conditions of steam
Initial pressure of steam
All of these

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Steam Boilers, Engines, Nozzles and Turbines
When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

Slow speed engine
Medium speed steam engine
None of the listed here
High speed steam engine

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.56
0.78
0.63
0.74

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Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Prevent flat surfaces under pressure from tearing apart
Take care of failure in shear
Provide support for boiler
Take care of failure in compression

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure at which latent heat of vaporisation is zero is

1 kgf/ cm²
273 kgf/ cm²
225.65 kgf/ cm²
100 kgf/ cm²

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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.

Stop valve
Safety valve
Fusible plug
Blow off cock

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