In a screw jcak, the effort required to lower the load is

Related MCQs

• In a screw jack, the effort required to lift the load is given by. Where W = Load lifted, ? = Helix angle, and ? = Angle of friction
• In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
• The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is
• A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.
• A screw jack used for lifting the loads is
• A machine which is capable of doing work in the reversed direction, after the effort is re-moved, is called a non-reversible machine.
• A machine which is capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
• A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
• The velocity ratio in case of an inclined plane inclined at angle ? to the horizontal and weight being pulled up the inclined plane by vertical effort is
• The minimum force required to slide a body of weight W on a rough horizontal plane is