A spur gearset has a pinion speed of 1120 rev/min. there are 17 teeth on the pinion and 51 teeth on the gear. the pressure angle is 20 deg and the overload factor ko=1 the diameteral pitch is 6 tetth/ in and the face width of 2 in the pinion cycle life is to be 108 rev at a reliablity of 0.99. the quality number is 5. the material is a through hardened steel, grade 1 with brinell hardness of 232 core and case of both gear. for a design factor of 3 what is the capacity in hp of the pinion cnosidering only bending Ks=1

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan