Determine the mean diameter of the wheel if the turbine were of single impulse stage,

Question

Steam expands in a steam turbine isentropically from inlet to exhaust having an enthalpy drop = 1200 kJ/kg. Assuming ideal conditions, determine the mean diameter of the wheel if the turbine were of:

1. single impulse stage,
2. single 50% reaction stage,
3. one two-row Curtis stage and
4. ten 50% reaction stages.

Take the nozzle angle as 18⁰ and blade speed as 4000 rpm.                                               30