Economiser is used to heat
A. air
B. feed water
C. flue gases
D. all above
Answer: Option B
Solution (By Examveda Team)
An economiser is used to heat feed water.Feed water: This is the water supplied to the boiler to generate steam. The economiser increases the temperature of the feed water by utilizing the heat from the flue gases exiting the boiler.
Purpose: By heating the feed water, the economiser improves the overall efficiency of the boiler by recovering waste heat, thus reducing fuel consumption.
Not used for: Heating air or flue gases, although it works with the heat from flue gases to perform its function.
This Question Belongs to Electrical Engineering >> Power Plant Engineering In EE
Rankine efficiency of a steam power plant
A. improves in summer as compared to that in winter
B. improves in winter as compared to that in summer
C. is unaffected by climatic conditions
D. none of the above
The artificial draught normally is designed to produce
A. less smoke
B. more draught
C. less chimney gas temperature
D. all of the above
In a boiler installation the natural draught is produced
A. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
B. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
C. due to the fact that at the chimney top the pressure is more than its environmental pressure
D. all of the above
In a regenerative feed heating cycle, the greatest economy is affected
A. when steam is extracted from only one suitable point of steam turbine
B. when steam is extracted from several places in different stages of steam turbine
C. when steam is extracted only from the last stage of steam turbine
D. when steam is extracted only from the first stage of steam turbine
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