Related Questions

The function of an economiser in a boiler is to preheat the
A Feedwater
B Combustion air
C Pulverised coal
D Furnace oil
Economiser is used to heat
A air
B feed water
C flue gases
D all above
An economiser _________ the steam raising capacity of a boiler.
A Increases
B Decreases
C Has no effect on
D None of these
An economiser is installed in a boiler primarily to
A Superheat the steam
B Reduce fuel consumption
C Increase steam pressure
D All of these
An economiser in a boiler
A Increases steam pressure
B Increases steam flow
C Decreases fuel consumption
D Decreases steam pressure
The economiser is used in boilers to
A Increase thermal efficiency of boiler
B Economize on fuel
C Extract heat from the exhaust flue gases
D Increase flue gas temperature
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?
A It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
B Economiser tube life increases due to handling of low temperature water
C Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
D Scale formation rate on economiser tubes increases
Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
A 1
B 10
C 30
D 45
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
A Beryllia
B Carborundum
C Corundum
D Thoria
Generally the purlins are placed at the panel points so as to avoid
A Axial force in rafter
B Shear force in rafter
C Deflection of rafter
D Bending moment in rafter

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