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
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
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
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
Economiser is used to heat
A air
B feed water
C flue gases
D all above
An economiser is generally placed between
A Last superheater or reheater and air preheater
B Induced draft fan and forced draft fan
C Air preheater and chimney
D None of the above
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
Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?
A Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
B Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler
C Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes
D Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

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