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 planar mechanism flexure mechanism spherical mechanism spatial mechanism 2. These two simple machines make a screw: Inclined plane and wedge Lever and wedge Wheel and axle and inclined plane Pulley and lever 3. If the link next to the shortest link is fixed, what type of mechanism is obtained? Double rocker mechanism Linkage is not planar Crank rocker mechanism Double crank mechanism 4. Which mechanism is shown in the given diagram? flexure planar spherical spatial 5. The bottom of a light bulb is what type of simple machine? Pulley Wedge Complex machine Screw 6. Mechanical advantage is the ratio of effort to load. False True 7. In drilling operation, work should be held by hand. True False 8. Nut crackers are examples of what class of lever fifth class lever second class lever fourth class lever first class lever 9. Which of the following operations can’t be performed on a drilling machine? lapping tapping reaming none of the mentioned 10. How does a ramp make work easier? It helps hold a door open so I don't have to. You can ride your skateboard up it, rather than walking up the stairs It spreads the work out over a longer distance. None of these 11. Hooke’s universal joint is an example of spatial mechanism. False True 12. A linkage containing a screw pair is an example of Flexure mechanism Spatial mechanism Spherical mechanism Planar mechanism 13. A mechanism where there are no restrictions on the relative motion between the particles, the mechanism is called spatial mechanism flexure mechanism spherical mechanism planar mechanism 14. The pivot point of a lever is called a ____________________. 15. We can’t perform grinding operation in a drilling machine. True False 16. 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 25.5mm 20mm 30mm 17. When the load is between the fulcrum and the effort it is fifth class lever first class lever second class lever fourth class lever 18. A _________________is used to hold things together. This is described as an incline plane wrapped around a cylinder. 19. The critical value at which crack extension occurs is called Stress Intensity Factor Fracture Toughness None of the mentioned Toughness 20. A bottle opener belongs to which class of the levers. Effort in the middle Fulcrum in the middle None of the mentioned Resistance in the middle 1 out of 20 Time is Up! Time's up