An axial turbine of high hub-tip ratio runs with zero degree reaction and peak efficiency at design flow and speed. the nozzle exit angle is 70 degrees from the axial direction. Estimate (a) the percentage chain in toque accompanying a 20 percent drop in speed (from the axial direction) while operating with design mass flow. (b) the corresponding degree of reaction. Changes in density in the rotor may be considered negible under design and off-design conditions. The rotor exit relative flow angle may be assumed not to vary with shaft speed.