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WorksheetsBoilers
Total questions: 15
Worksheet time: 15mins
What is the difference between the superheated, cooled and saturated steam?
Humidity rate
The energy which could be converts into the heat in at the same pressure
Pressure at the same enthalpy.
Temperature difference
Name the main feature of the heat dynamic equilibrium in boiler operation.
Constant fuel consumption per hour.
Constant parameters of generated steam
Constant feed water consumption.
Constant number of turbine revolutions
Name the main feature of the material balance in boiler operation.
Constant fuel consumption per hour.
Constant steam consumption per hour.
Constant feed water consumption per hour.
Constant water level in the boiler.
On which heating surface of the boiler does heat transfer take place at the highest gas temperature?
In the superheater.
On steam generating surface.
In the economizer.
In the airheater
On which heating surface of the boiler does heat transfer take place at the highest metal temperature?
On steam generating surface.
In the economizer.
In the airheater.
In the superheater.
In what places of the boiler do we see damaging effect of the vanadium in the fuel oil?
In superheaters at high metal temperature
In airheaters at low metal temperature.
At presence of water due to tube leakages.
At presence of water from atmosphere when boiler doesn`t operate.
For what purpose should you know the specific gravity of fuel?
To determine the grade of fuel oil.
To recalculate the tank volumes into weight units.
To determine the temperature of heating for pumping.
To determine the temperature of heating before atomization.
What feature determines the grade of fuel oil?
Heating value.
Sulphur content.
Viscosity.
Ash content.
What is the function of separators in the system?
To remove sulphur.
To remove mechanical impurities
To remove water and mechanical impurities.
To decrease heavy fuel oil viscosity
For what purpose is the fuel atomized before the furnace?
For increasing activity surface
For complete, thorough mixture with air.
For increasing fuel heating.
For what purpose is the fuel heated before the burner?
to increase kinetic energy of fuel particles.
to decrease viscosity and increase atomization dispersity
To increase temperature determining rate of combustion.
To remove extra humidity from fuel oil.
For what purpose the air supplied to the furnace is given a whirling motion.
For proper direction of air flow along the furnace axis.
For cleaning from dust and moisture by centrifugal forces.
For increase of oxygen supply rate and better mixture.
For what purpose the air supplied to the furnace heated?
For removal humidity from air.
For increase of temperature and rate of combustion
For increase of specific volume and air rate.
For increase of fuel energy.
What is the function of the diffuser?
To supply limited quantity of air to the flame.
To control the air supply to the furnace.
To change the direction of air flow in the furnace
To control the length of flame in the furnace.
How is the change in air supply made?
By turning vanes.
By controlling damper on the register.
By controlling damper on air line before the boiler.
By chagining fan number of revolution
