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Assignment 5, Continued - 14081_589
Assignment 5, Continued - 14081_591

Equipment Operator Basic - Beginning construction equipment operators manual
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5-64. Overuse of brakes can cause too much heat to be generated, and this condition can result in brake failure. 1. True 2. False 5-65. When you are operating a tractor– trailer,    the power springs on the spring brakes are held back by what force? 1. Gravity 2. Mechanical  linkage 3. Hydraulic  fluid 4. Air  pressure 5–66. Tractor  and  straight  truck  spring brakes  engage  when  the  air  pressure drops to what pressure range? 1. 20 to 45 psi 2. 45 to 60 psi 3. 60 to 80 psi 4. 80 to 90 psi 5-67. A  diamond  shaped,  yellow  push–pull control knob is used to engage or disengage what component on a tractor? 1. The  fifth-wheel  lock 2. The front axle PTO shaft 3. The  parking  brakes 4. The  differential  lock 5-68. What term is used to describe applying the brakes as hard as possible  without  locking  the wheels? 1. Severe  braking 2. Controlled  braking 3. Panic  braking 4. Stab  braking 5–69. You should NOT use the trailer hand valve because of the danger of making the trailer skid. 1. True 2. False 5-70. What condition(s) result when the tractor protection valve closes? 1. Air is kept from escaping from the tractor only 2. The  air  compressor  is  shut down only 3. Air from the tractor emergency line is shut off and the air compressor  is  activated 4. Air  from  the  trailer  emergency line is shut off and air is kept  from  escaping  from  the tractor 5-71. What is the name of the line that carries air to the trailer and is controlled by the foot valve or trailer  hand  brake? 1. Service 2. Emergency 3. Drive 4. Electrical 5–72. As  pressure  increases  in  the service line,   what  valve  opens and sends air pressure from the trailer air tanks to the trailer brake  chambers? 1. The  release 2. The  protector 3. The relay 4. The jet 5–73. What is the function of the emergency  line? 1. Sends air to the relay valve only 2. Supplies air to the trailer air tanks only 3. Sends air to the relay valve and  controls  the  emergency brakes  on  combination  vehicles 4. Supplies air to the trailer air tanks and controls the emergency  brakes  on  combination vehicles 5-74. What is the name of the rubber seals that are on the glad hand? 1. Rubber  washer 2. Rubber  grommet 3. Rubber  gasket 4. Rubber  mate 38







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