Welcome to your Simple Machines (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. 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. Screw Incline plane Wedge Simple Machine 2. Hooke’s universal joint is an example of spatial mechanism. False True 3. A linkage containing a screw pair is an example of Planar mechanism Spatial mechanism Spherical mechanism Flexure mechanism 4. The drilling machine was primarily designed to originate a _____ taper surface cylindrical surface none of the mentioned flat surface 5. A right angled bell-crank is designed to raise a load of 5kN at short arm whose length is 100mm. Longer arm is of length 500mm. Calculate the reaction or force acting on the fulcrum. 6.1 5.1 6.8 5.8 6. Nut crackers are examples of what class of lever second class lever first class lever fifth class lever fourth class lever 7. In drilling operation, work should be held by hand. False True 8. When the load is between the fulcrum and the effort it is fifth class lever second class lever fourth class lever first class lever 9. 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. Screw Wheel and Axle Pulley Incline plane 10. The formula for the mechanical advantage of an inclined plane is: Distance divided by height Input arm divided by the output arm Height divided by distance Output arm divided by input arm 11. If the relative motions of the rigid bodies are in one plane or in parallel planes, then the mechanism is called flexure mechanism spatial mechanism spherical mechanism planar mechanism 12. What simple machine combines with itself to make a wedge? Inclined plane Wheel and axle Gear Lever 13. Which mechanism is shown in the given diagram? spherical planar flexure spatial 14. 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 planar mechanism spatial mechanism spherical mechanism flexure mechanism 15. Ball bearing is used to reduce adhension tension viscosity friction 16. Which of the following device is not used for holding the work in a drilling machine? none of the mentioned both step block and drill jigs step block drill jigs 17. The pivot point of a lever is called a ____________________. 18. How many classes of levers are there? 2 3 5 4 19. All of these are examples of inclined planes except: Hatchet Ramp Staircase Wheel 20. The critical value at which crack extension occurs is called Fracture Toughness Toughness Stress Intensity Factor None of the mentioned 1 out of 20 Time is Up! Time's up