# Mechanical Engineering

Basics of Mechanical Engineering

## LATEST ➤ Calculate the maximum allowable pressure difference allowed between the inside and outside of a sphere 50 mm mean diameter with a wall 0.6 mm thick if the maximum allowable stress is 1.5 MPa. (see solution)
➤ A cylinder is 300 mm mean diameter with a wall 2 mm thick. Calculate the maximum pressure difference allowed between the inside and outside if the stress in the wall must not exceed 150 MPa. (see solution)
➤ Find the maximum torsional shear stress in a solid circular shaft of diameter 10 mm, when the applied torque is 30 N.m. (see solution)
➤ A solid steel shaft in a rolling mill transmits 20 KW at 2 Hz. Determine the diameter of the shaft if the shearing stress in not to exceed 40 MPa. (see solution)
➤ A shaft of diameter 8 cm is subjected to a bending moment of 30,000 N-cm and a twisting moment of 40,000 N-cm. The maximum normal stress induced in the shaft is equal to? (see solution)
➤ The ratio of bulk modulus to Young modulus for a Poisson’s ratio of 0.25 will be? (see solution)
➤ The ratio of shear modulus to the modulus of elasticity for a Poisson’s ratio of 0.4 will be? (see solution)
➤ A circular shaft can transmit a torque of 5 KN-m. If the torque is reduced to 4 KN-m, then the maximum value of bending moment that can be applied to the shaft is? (see solution)