Question:medium

A single stage impulse turbine with a diameter of 1.2 m runs at 3000 rpm. If the blade speed ratio is 0.42, the inlet velocity of steam will be (in $\text{ms}^{-1}$)

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To perform the calculation quickly without a calculator, approximate $\pi \approx \frac{22}{7}$ or $3.14$. - $u = 60 \times 3.14 = 188.4 \text{ m/s}$. - Then, $V_1 = \frac{188.4}{0.42} \approx \frac{188.4}{0.4} = 471 \text{ m/s}$. Since $0.42$ is slightly larger than $0.4$, the true value must be slightly less than $471$, pointing directly to $450 \text{ m/s}$ (Option A).

Updated On: Jul 9, 2026

\(450 \)
\(900 \)
\(200 \)
\(600 \)

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The Correct Option is A

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