He efficiency of a steam power plant can be increased by bleeding off some of the steam that would normally enter the turbine and usingit to preheat the water entering the boiler. in this process, liquid water at 50oc and 1000 kpa is mixed with superheated steam at 200oc and 1000 kpa. if the plant operators want to produce a saturated liquid at 1000 kpa, what ratio of mass flow rates of water and superheated steam are required? [20]

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented