The modern steam turbines are
A. impulse turbines
B. reaction turbines
C. impulse-reaction turbines
D. none of the above
Answer: Option C
Solution(By Examveda Team)
Modern steam turbines can be classified as impulse-reaction turbines. These turbines combine elements of both impulse and reaction turbine designs to optimize their performance.Impulse turbines work on the principle of the high-velocity impact of steam or gas jets on the blades. They are primarily used for high-pressure and low-flow applications.
Reaction turbines, on the other hand, work on the principle of the gradual expansion of steam or gas as it flows over the blades. They are more suitable for high-flow and low-pressure applications.
Impulse-reaction turbines, as the name suggests, incorporate features of both these principles. They efficiently utilize the energy of both the high-velocity impact and the gradual expansion of steam, making them versatile and suitable for a wide range of operating conditions.
So, the correct answer is Option C: impulse-reaction turbines.
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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
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
Artificial draught is produced by