5.2. A liquid-level system, such as the one shown in Fig. 5–1, has a cross-sectional area of 3.0 ftº. The
valve characteristics are
9 =
8 vh
where q = flow rate, cfm, and h = level above the
valve, ft. Calculate the time constant for this system
if the average operating level above the valve is
(a) 3 l
(b) 9 fu

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false