# The relative velocity of air leaving a straight radial impeller of a centrifugal compressor is $100 \mathrm{~m} / \mathrm{s}$. If the impeller tip speed is $200 \mathrm{~m} / \mathrm{s}$, for a slip free operation, the absolute velocity (in m/s) at the impeller exit is______________(accurate to one decimal place)

## Question ID - 155548 :- The relative velocity of air leaving a straight radial impeller of a centrifugal compressor is $100 \mathrm{~m} / \mathrm{s}$. If the impeller tip speed is $200 \mathrm{~m} / \mathrm{s}$, for a slip free operation, the absolute velocity (in m/s) at the impeller exit is______________(accurate to one decimal place)

3537

Answer Key : (222.0 to 225.0) -

222.0 to 225.0

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An aircraft wind tunnel model, having a pitch axis mass moment of inertia $\left(I_{y y}\right)$ of $0.014 \mathrm{~kg}-\mathrm{m}^{2},$ is mounted in such a manner that it has pure pitching motion about its centre of gravity, where it is supported through a frictionless hinge. If the pitching moment (M) derivative with respect to angle of attack $(\alpha)$, denoted by ' $\mathrm{M}_{a}$, is $-0.504 \mathrm{~N}-\mathrm{m} / \mathrm{rad}$ and the pitching moment (M) derivative with respect to pitch rate (q), denoted by 'M $_{\mathrm{q}}$, is $-0.0336 \mathrm{~N}-\mathrm{m} /(\mathrm{rad} / \mathrm{s}),$ the damping ratio of the resulting motion due to an initial disturbance in pitch angle is approximately_______________ (accurate to three decimal places).