Related Questions

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
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
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
An economiser in a boiler
A Increases steam pressure
B Increases steam flow
C Decreases fuel consumption
D Decreases steam pressure
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
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these

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