86) A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress the

87) The longitudinal stress is __________ of the circumferential stress.

88) The expression 0.175 - 0.841/T is the Lewis form factor for

89) A screw will be self locking, if

90) The maximum shear stress theory is used for