Related Questions

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
The function of an economiser in a boiler is to preheat the
A Feedwater
B Combustion air
C Pulverised coal
D Furnace oil
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
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as
A Blow off cock
B Fusible plug
C Superheater
D Stop valve
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase
A Increases
B Decreases
C Remains unchanged
D Increases/decreases depending on steam temperature requirements
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.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
A 10 atmospheres
B 20 atmospheres
C 30 atmospheres
D 40 atmospheres
Steam in water tube boiler as compared to fire tube boiler
A Can be raised rapidly
B Is raised at slower rate
C Is raised at same rate
D Could be raised at fast/slow rate depending on design

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