16/12/2019Simple Machines (STUDY BY TOPICS JUNIOR CLASS) 0Comments by Gate Academy Welcome to your Simple Machines (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. A baseball bat is an example of this class of lever: Third-class Second-class Fourth-class First-class2. What 2 simple machines make up a pair of scissors? None of the above Wedge and lever Screw and incline plane Pulley and wheel and axle3. Coplanar motion is the motion transformation of any planar mechanism. False True4. What is used to make holes in hard objects wheel axle screw tonge5. The critical value at which crack extension occurs is called None of the mentioned Fracture Toughness Stress Intensity Factor Toughness6. The pivot point of a lever is called a ____________________.7. What simple machine combines with itself to make a wedge? Gear Inclined plane Lever Wheel and axle8. How many classes of levers are there? 4 5 2 39. 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 5.8 6.810. A mechanism where there are no restrictions on the relative motion between the particles, the mechanism is called planar mechanism spherical mechanism spatial mechanism flexure mechanism11. If the link next to the shortest link is fixed, what type of mechanism is obtained? Linkage is not planar Double crank mechanism Crank rocker mechanism Double rocker mechanism12. 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 10mm 100mm 1000m13. How does a ramp make work easier? You can ride your skateboard up it, rather than walking up the stairs It helps hold a door open so I don't have to. It spreads the work out over a longer distance. None of these14. Ball bearing is used to reduce viscosity friction adhension tension15. 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 Incline plane Pulley16. We can’t perform grinding operation in a drilling machine. False True17. Leverage is the ratio of load arm to effort arm. False True18. There are how many classes of levers 2 4 3 119. The formula for the mechanical advantage of an inclined plane is: Height divided by distance Distance divided by height Input arm divided by the output arm Output arm divided by input arm20. These two simple machines make a screw: Inclined plane and wedge Pulley and lever Wheel and axle and inclined plane Lever and wedge21 out of 20Time is Up!