84) The following part of Lathe serves as housing for the driving pulleys and back gears

85) Which of the following is the correct type of threads used in lead screw having half nut in lathe which is free to rotate in both directions?

86) If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to

87) Euler's formula holds well only for

88) The simply supported beam 'A' of length l carries a central point load W. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is