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Mechanical Engineering - Steam Nozzles and Turbines

Exercise : Steam Nozzles and Turbines - Section 3
36.
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)
Vb = 0.5 V cos α
Vb = V cos α
Vb = 0.5 V2 cos α
Vb = V2 cosα
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The velocity of whirl at outlet for an axial discharge turbine is
minimum
maximum
zero
Answer: Option
Explanation:
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38.
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.
equal to
less than
greater than
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
The friction present between the steam and the nozzle surfaces reduces the heat drop by
10 to 15 percent
15 to 25 percent
25 to 40 percent
40 to 60 percent
Answer: Option
Explanation:
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40.
An impulse turbine as compared to a reaction turbine, for a given power has __________ row of blades.
equal
less
more
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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