A smooth vertical steel tube carries water at a pressure of 10 bars. Saturated liquid water is pumped into the D=0.05 diameter tube at its bottom end (x=0) with a mean velocity of um=0.005 m/s. The tube is exposed to combusting pulverized coal, providing a uniform heat flux of q''=2000 W/m^2 . Determine the tube wall temperature and the quality of the flowing water at x=15 m. Assume Gs, f=1.

Saturated water, liquid (10 bars): Tsat = 452.8 K, \rho = 887.3 kg/m3 , hfg =2014 kJ/kg, \mu L =149.4 × 10- 6 N⋅s/m2 , kL = 0.6766 W/m⋅K, Prl Prl= 0.979;

Water vapor: \rho v = 5.094 kg/m3 , µv = 14.95 × 10-6 N⋅s/m2 , kv = 0.03353 W/m⋅K, Prv = 1.149.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

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.