Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat rankine cycle at 1000 psia and 900°f and leaves as saturated vapor. steam is then reheated to 800°f before it expands to a pressure of 1 psia. heat is transferred to the steam in the boiler at a rate of 6 × 10^4 btu/s. steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45°f. use steam tables. determine the following: (a) the pressure at which reheating takes place. psia (b) the net power output and thermal efficiency. % (c) the minimum mass flow rate of the cooling water required. lbm/s

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa