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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

Water level indicator
Pressure gauge
Safety valve
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are those in which

Change in enthalpy
Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Work is done during adiabatic expansion

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Steam Boilers, Engines, Nozzles and Turbines
The Locomotive boiler has

147 fire tubes and 34 superheated tubes
137 fire tubes and 44 superheated tubes
157 fire tubes and 24 superheated tubes
167 fire tubes and 14 superheated tubes

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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

0.78
0.63
0.56
0.74

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Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small steam plants is to

Create vacuum at turbine exhaust
Create vacuum in furnace
Dose chemicals in feed water
Pump feed water

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Steam Boilers, Engines, Nozzles and Turbines
At very low temperature, the melting and boiling temperatures become equal. This temperature is

303°K
0°K
373°K
273.16°K

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