Agas contained within a piston-cylinder assembly undergoes three processes in series:

process 1-2: constant volume from p1 = 1 bar, v1 = 4 m3 to state 2, where p2 = 2 bar.

process 2-3: compression to v3 = 2 m3, during which the pressure-volume relationship is pv = constant.

process 3-4: constant pressure to state 4, where v4 = 1 m3.

sketch the processes in series on p-v coordinates and evaluate the work for each process, in kj.

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

The higher the astm grain size number, the finer the gran is. a)-true b)-false