Mechanical Engineering :: Steam Nozzles and Turbines
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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)
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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.
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The friction present between the steam and the nozzle surfaces reduces the heat drop by
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Degree of reaction is defined as the ratio of
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A.
heat drop in fixed blades to the heat drop in moving blades |
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B.
heat drop in moving blades to the heat drop in fixed blades |
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C.
heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades |
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D.
heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades |