Engineering Answers

The viscosity of a fluid is to be measured by a viscometer constructed of two 3m long concentric cylinders. the inner diameter of the outer cylinder is 35cm, and the gab between the two cylinders is 0.14m.the outer cylinder is rotated at 250rpm and the torque is measured to be 1.8N determine the viscosity of fluid

Polyester has a Young's, Modulus of 3.5 GPa and PLGA 1.2 GPa. A polymer blend is prepared with 45:55 mixture (PET:PlGA) . What is the Young's, Modulus of this blend (use mixture rule)

A 20degC water flows to 50cmx60cm flat plate with velocity of 6.5m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?

Fluid A with specific enthalphy 2260 kj/kg flows steadily into a mixing tank at a rate of 0.75kg/s.A second fluid B with a specific enthalphy of 160 kj/kgalsoo flows into the tank at steady rate. during mixing heat is lost to the surrounding s at 1260JK/min.If specific enthalphy of the fluid mixture flowing from the tank is 1040KJ/kj. Calculate the rate of flow of fluid B.

air enters a centrifugal compressor at 1 bar and leaves at 2.1 bar.During the passage of the air through the compressor, the compressor, the specific internal energy of the air increases by 56kj/kg and the specific volume decreases from 0.825 m^3/kh to 0.5m^3/kg.Assuming that the flow iss adiabatic and that the changes in kinetic energy are negligible, calculate the power required to drive the compressor when air flow rate is 135kg/min

8. Find the standard distance between sprocket having 4 in and 16 in diameters.

7. A chain with speed 800 fpm has driving sprocket turns at 900 rpm. If the pitch of chain is ¾ in, find the number of teeth of driving sprocket.

23. Find the sensible heat factor of an air-conditioning unit having a sensible heat load of 60 kw and latent heat

load of 20 kw.

A. 70% B. 80% C. 75% D. 85%

22. A coil has an inlet temperature of 50 oF and outlet of 85 oF. If the mean temperature of coil is 100 oF, find

the bypass factor of the coil. (SHOW THE SOLUTION)

A. 0.4 B. 2 C. 1.667 D. 0.3

21. Bypass factor of coil is 0.8 for one row. What is the bypass factor if there are 8 coils in a row? (SHOW THE SOLUTION NOT EXPLAINATION)

A. 0.029 B. 0.70 C. 0.80 D. 0.49