A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg

Related MCQs

• Efficiency of a screw jack in maximum when its 31 helix angle, ? is
• The maximum efficiency of a scres jack having square threads and friction angle of 30 degree will be
• A single purchase crab has a handle 45 cm long and a drum of 25 cm diameter. The pinion has 30 teeth and spur has 150 teeth. The efficiency of the machine is 75%. If the maximum force that can be applied is 500 newtons, the maximum load that can be lifted will be
• The moment of inertia of a semi-circle of radius r with respect to a centroidal axis parallel to the diameter is
• The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be
• The moment of inertia of a hollow circular section whose external diameter is 8 cm and interial diameter is 6 cm about the axis passing through its centre is
• A flywheel weighs 400 kg and has a radius of gyration of 30 cm about its axis of rotation. It is mounted on a shaft subjected to a moment of 40 kgm. If the flywheel starts from restits speed after 3 seconds wil be
• The satellite moves in a circle around the earth. The radius of this circle is equal to one-half the radius of the moons orbit. The satellite will complete one revolution in
• The radius of gyration of a solid sphere of radius r is equal to
• A sphere of radius r is cut from larger sphere of radius R. The distance between their centre is a. The centroid of the remaining valoume lies on the line of centres and the sistanc from the centre of the larger sphere is