Engineering Answers

An axial pull of 40000 N is acting on a bar consisting of three sections of length 30 cm, 25 cm, and 20 cm and of diameters 2 cm, 4 cm and 5 cm respectively. If the young’s modulus = 2×105 N/mm2, determine: (i) stress in each section and (ii) total extension of bar.

16. Find the dew point temperature of air whose humidity ratio is 0.0150 kg water/kg dry air. (I NEED THE SOLUTION FOR THE ANSWER PLEASE)

ANSWER: 22.50 oC

In a porter governor the mass of the central load is 18 kg and the mass of each ball is 2kg. the top arms (250+X) mm while the bottom arms are (300+X) mm long. The friction of the sleeve is 20 N. If the top arms make 45 degree with the axis of rotation in the equilibrium position, find the range of the speed of the governor in that position

Air refrigeration works between 1 bar and 5 bar pressure limits. The temperature of the air entering the compressor and expansion cylinder is 8+A0C and 20+B0C respectively. The expansion and compression follow the law pv1.3=Constant. Find the following: • The theoretical C.O.P of the refrigerating cycle. • If the load on the refrigerating machine is 10 tons, then find the amount of air circulated per minute through the system. Assuming the actual C.O.P is 50% of the theoretical C.O.P. • Length and diameter of the single-acting compressor run at 300 r.p.m and the volumetric efficiency are 85%.

The thin-walled single cell beam shown in Figure has been idealized into a combination of

direct stress carrying booms and shear stress only carrying walls. If the section supports a vertical

shear load of 10 kN acting in a vertical plane through booms 3 and 6, calculate the distribution of

direct stress around the section.

Steam at a temperature of 623 K is flowing through a pipe with an outer diameter of 100 mm. The pipe is insulated with 20-mm thick mineral wool, the average thermal conductivity of which is 0.055 W/m.K. Determine the outside surface temperature of mineral wool if the ambient air temperature is 300 K. Assume the hot-surface temperature of the mineral wool is the same as that of the flowing steam and the value of the surface coefficient of the insulating material is 30 W/m².K.

combustion of methane with air . the volumetric analysis of the products oon a dry basis revela sthe following