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WorksheetsSTEAM BOILERS
Total questions: 50
Worksheet time: 50mins
Air preheater is used to preheat air with the help of ______
Air
Flue gases
Water
Steam
_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.
Conduction
Convection
Radation
Combustion
The following is the correct order of energy conversion in thermal power plants
Chemical energy – Mechanical energy – Electrical energy
Mechanical energy – Chemical energy – Electrical energy
Wind energy – Mechanical energy – Electrical energy
Heat energy – Electrical energy – Mechanical energy
In thermal power plant, turbine is placed
before boiler
in between boiler and generator
after generator
any of the above
In thermal power plants, the dust of flue gases is trapped by
Precipitator
Economizer
Superheater
Air preheater
The path of flue gases in Thermal power plant is
Boiler – Economizer – Superheater– Air preheater
Boiler – Superheater – Air preheater – Economizer
Boiler – Air preheater – Superheater – Economizer
Boiler – Superheater – Economizer – Air preheater
The following is not a component of Thermal power plant
Condenser
Cooling tower
Turbine
Fuel tank
For steam boilers, the fuel(s) is (are) mainly
Bituminous coal
Fuel oil
Natural gas
All of the above
The thermal efficiency of a steam power station is.......
38%
28%
40%
45%
The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.
Temperature
Potential
Density
None of the above
The major heat loss in a steam power station occurs in ........
Heat chamber
Penstock
Spillways
Condenser
The cost of fuel transportation is maximum in........
Hydro-electric power plant
Steam power plant
Nuclear power plant
Wind power plant
The boiler commonly used in a thermal plant are__________________.
Water tube type
Fire tube
Both (a) & (b)
None of these
The equipment which produces steam pressure above (a) bar is called high pressure boiler
Steam is classified as
WET STEAM
DRY STEAM
SUPER HEATED STEAM
ALL THE ABOVE
Why is high-quality steel used to make boilers
Its cheaper to produce
It's easier to bend and use in the manufacturing process
Because boilers are subjected to high stress and heat during operation
to reduce cost
What forces are a boiler subjected to during operation
compression
tension
shear
all of the above
It is defined as a component in the plant cycle that consists of a closed vessel that uses the heat produced by the combustion of fuel to efficiently vaporize and convert water into steam at the desired temperature and pressure.
Steam Drum
Boiler
Furnace
Reheater
________is the transfer of heat through a solid object, or between two objects, as a result of physical contact.
Conduction
Convection
Radiation
It is an extremely high-temperature vapor generated by heating the saturated steam obtained by boiling water.
Superheated Steam
Saturated Steam
Unsaturated Steam
Vapor
_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.
Conduction
Convection
Radation
Combustion
The three ingredients needed to start a fire are fuel, heat, and ___.
carbon dioxide
combustible material
nitrogen
oxygen
Which type of boiler should not be used for high pressure steam applications
Cast iron
Fire tube
Water tube
Straight tube
This boiler has flue gasses passing around the tubes and water flowing through the tubes
Fire tube
Cast iron
Condensing
Water tube
What is created by the boilers at the power plant?
Smoke
Steam
Pollution
Air preheater is used to preheat air with the help of ______
Air
Flue gases
Water
Steam
The following is the correct order of energy conversion in thermal power plants
Chemical energy – Mechanical energy – Electrical energy
Mechanical energy – Chemical energy – Electrical energy
Wind energy – Mechanical energy – Electrical energy
Heat energy – Electrical energy – Mechanical energy
In thermal power plants, the dust of flue gases is trapped by
Precipitator
Economizer
Superheater
Air preheater
The following is not a component of Thermal power plant
Condenser
Cooling tower
Turbine
Fuel tank
The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.
Temperature
Potential
Density
None of the above
The primary function of a combustion control system is to regulate the ___ in a boiler.
fuel supply
air supply
draft
all of the above
An operating pressure control must be connected to the ___.
main steam line
main feedwater line
highest part of the steam side of the boiler
water side of the boiler below the NOWL
The two settings found on the boiler operating pressure control are used to ___.
set the operating steam pressure range of the boiler
eliminate low water
maintain high and low fire
warn the operator of flame failure
boiler water is treated to prevent...
scale
oxygen pitting
caustic embrittlement
all of the above
hardness is a measure of scale forming __ dissolved in water
minerals
pollutants
gases
none of the above
boiler water having high alkalinity could develop ___
acidic corrosion
oxygen pitting
caustic embrittlement
warping
a direct cause of overheating of the boiler tubes is ___
soot formation
operating at high fire
insufficient air
scale formation on the tubes
A boiler that has water around the tubes and flue gasses inside the tubes?
Scotch Marine
A Tube
Copper Fin
Jessies Mom
Steam Boilers must be blown down daily due to formation of this that drops out of the water when it is turned to steam
Mud
Hydrogen
Oxygen
Tears
This is a Byproduct of incomplete combustion?
Carbon Dioxide
Excess Air
CO
O2
___ draft is created by a draft fan that pulls the gases of combustion through the furnace.
Forced
Natural
Induced
Chimney
Pressure at the discharge side of a forced draft fan is ___ atmospheric pressure.
balanced at
less than
the same as
greater than
___ compounds are classified as a pollutant because they react with water vapor to form sulfuric acid.
Carbon
Ozone
Nitrogen
Sulfur
Mechanical draft is produced by ___.
the height of the chimney
the diameter of the chimney
power-driven fans
steam jets
Mechanical draft can be classified as ___.
pressurized
natural
regenerative
forced or induced
The induced draft fan is located ___.
between the burner and the chimney
inside the air preheater
at the burner
in the first pass of the gases of combustion
Mechanical draft is used when burning ___.
fuel oil
coal
gas
all of the above
A ___ draft system is used to overcome air and gas-flow resistance
secondary
primary
forced
balanced
The oldest form of draft used in a boiler is ___ draft.
mechanical
natural
forced
combination
Boilers can be equipped with ___ to reduce the heat loss from the gases of combustion going to the chimney.
open feedwater heaters
superheaters
economizers and air heaters
baffles in uptakes
