22. The values of enthalpies at the stator inlet and rotor outlet of a hydraulic turbomachine stage are h and h3 respectively. The enthalpy at the stator outlet (or, rotor inlet) is h. The condition (h2 - h) (h3 - h2) indicates that the degree of reaction of this stage is (A) 100% (B) zero (C) 75% (D) 50% 23. A circular disk of radius r is confined to roll without slipping at P and Q as shown in the figure. P Qum 2v If the plates have velocities as shown, the magnitude of the angular velocity of the disk is (A) 3v 2r (B) (C) 2r 2v (D) 3r 24. A beam of negligible mass is hinged at support P and has a roller support Q as shown in the figure. P 1200 N 4m 5m 5m R A point load of 1200 N is applied at point R. The magnitude of the reaction force at support Q is N. 25. If a reversed Carnot cycle operates between the temperature limits of 27C and -3C, then the ratio of the COP of a refrigerator to that of a heat pump (COP of refrigerator/COP of heat pump) based on the cycle is (round off to 2 decimal places).