A steel rotating-beam test specimen has an ultimate strength, Sut, of 1600 MPa (232 kpsi). Estimate the life of the specimen if it is tested at a completely reversed stress amplitude, σrev, of 925 MPa. Take the value of the fatigue strength fraction, f to be 0.77.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0