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Mechanical Engineering - Steam Nozzles and Turbines

Exercise : Steam Nozzles and Turbines - Section 3
31.
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.
10 to 15%
15 to 20%
20 to 30%
30 to 40%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
The effect of bleeding is that
it increases the thermodynamic efficiency of the turbine
boiler is supplied with hot water
it decreases the power developed by the turbine
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The expansion of steam, as it flows over the blades in reaction turbine, represents
isothermal process
isentropic process
throttling process
free-expansion process
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
more
less
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
For a Parson's reaction turbine, if α1 and α2 are fixed blade angles at inlet and exit respectively and β1 and β2 are the moving blade angles at entrance and exit respectively, then
α1 = α2 and β1 = β2
α1 = β1 and α2 = β2
α1 < β1 and α2 > β2
α1 = β2 and β1 = α2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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