Welcome to your Simple Machines (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. In a mechanical system, if the bodies move in a way such that the trajectories of points in the system lie on concentric sphere, then the mechanism is called flexure mechanism spatial mechanism planar mechanism spherical mechanism 2. Hooke’s universal joint is an example of spatial mechanism. False True 3. A rope, a wheel with a groove in it and a weight make up this simple machine. You can pull down on the rope to lift the weight. Pulley Wheel and Axle Incline plane Screw 4. The bottom of a light bulb is what type of simple machine? Screw Complex machine Wedge Pulley 5. For drilling operation, the drill rotates with_____ pressure if job is held on earth none of the mentioned upward 45 degree inclined to both planes downward 6. What simple machine combines with itself to make a wedge? Inclined plane Wheel and axle Gear Lever 7. A right angled bell-crank is designed to raise a load of 5kN at short arm whose length is 100mm. Also longer arm is of length 500mm. If permissible bearing pressure on pin is 10N/mm² and diameter of the 20mm, find the length of the pin. 35.5mm 20mm 25.5mm 30mm 8. Floating holder is included in______ method of tool holding devices. by directly fitting in the spindle none of the mentioned by a socket by special attachments 9. The distance between fulcrum and dead weights is 100mm. Dead weights are of 2945.2N. An effort of 294.52N acts on the other hand. Find the distance between the fulcrum and other end of the lever. 10000mm 100mm 1000m 10mm 10. How many classes of levers are there? 3 4 5 2 11. What is the definition of a screw? A flat sloped surface. A screw is not a simple machine. An inclined plane wrapped around a cylinder. Something that holds wood together. 12. A bottle opener belongs to which class of the levers. Effort in the middle Resistance in the middle None of the mentioned Fulcrum in the middle 13. Which of the following are not included under planar mechanisms? Hooke’s universal joint Plate cam and follower Slide crank mechanism Plane four bar linkage 14. These two simple machines make a screw: Inclined plane and wedge Wheel and axle and inclined plane Lever and wedge Pulley and lever 15. Pliers is an example of what class of lever fifth class lever second class lever first class lever fourth class lever 16. If the link next to the shortest link is fixed, what type of mechanism is obtained? Crank rocker mechanism Double crank mechanism Double rocker mechanism Linkage is not planar 17. A heavy object could be rolled up this simple machine, instead of lifting it straight up. Using this simple machine can save effort, although the object must usually cover more distance if this simple machine is used. Incline plane Screw Simple Machine Wedge 18. A baseball bat is an example of this class of lever: Fourth-class Third-class First-class Second-class 19. Planar mechanisms are ___________ dimensional whereas spatial mechanisms are ___________ dimensional. 3, 2 1, 2 2, 1 2, 3 20. Mechanical advantage is the ratio of effort to load. False True 1 out of 20 Time is Up! Time's up