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
Answer: Option B
Solution (By Examveda Team)
Rankine efficiency is a measure of how well a steam power plant converts heat into electricity.The efficiency is affected by the temperature of the steam and the temperature of the cooling water that condenses the steam back into water.
In winter, the cooling water (often from a river or lake) is colder.
A colder cooling water temperature leads to a lower condenser pressure.
A lower condenser pressure increases the net work output of the cycle.
This ultimately increases the Rankine efficiency.
In summer, the cooling water is warmer, so the efficiency is lower.
Therefore, the Rankine efficiency is better in winter than in summer.
This Question Belongs to Electrical Engineering >> Power Plant Engineering In EE
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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
During winter, the air is dryer so the boiler does lesser work compared to summer