2-51. On rock service treads, what is the primary  purpose  of  the  narrow  voids between  the  lugs? 1. Provides  traction  on  slippery surfaces 2. Provides  flexibility  on  rocky surfaces 3. Prevents loose rocks from being caught in the lugs 4. Prevents  the  lugs  from  filling with mud when working in muddy conditions Learning  Objective: Recognize the  principles  and  procedures of tire removal and repair. 2-52. When you raise a vehicle with a jack, always block the wheels on the axle that is being raised with the jack. 1. True 2. False 2-53. When breaking down a tire, you should perform which of the following  steps  first? 1. Force the tire bead away from  the  removable  side  ring 2. Inflate the tire to find the hole 3. Plug the hole in the tire 4. Remove the valve core and deflate  the  tire  completely 2-54. When  assembling  tires  equipped  with a removable side ring, you should install the valve stem so that it points  towards  the  removable  side ring. 1. True 2. False 2–55. When  assembling  a  tire  equipped with a lock ring that does NOT seat properly,  you  should  inflate  the tire with how many pounds of air pressure  before  tapping  the  lock ring with a mallet? 1. 5 to 10 pounds 2. 15 to 20 pounds 3. 25 to 30 pounds 4. 35 to 40 pounds 2-56. When  physically  inspecting  the inside of a tubeless tire, you should use a rag to protect your hand from injury. 1. True 2. False 2-57. When  plugging  a  tire,  you  should cut the plug at approximately what distance from the surface? 1. 3/4   inch 2. 1/2   inch 3. 1/4   inch 4. 1/16 inch 2-58. On a tube to be patched, you should buff or roughen the surface at least how many inches around the hole to be patched? 1. 1/2 inch 2. 1 inch 3. 1 1/2 inch 4. 2 inch 2-59. Tire  rotation  is  performed according  to  the  manufacturer’s specifications. 1. True 2. False 2-60. Which  of  the  following  personnel supervise  the  tire  shop? 1. Transportation   supervisor 2. Maintenance   supervisor 3. Projects  supervisor 4. Heavy  shop  supervisor 14