BSEP ASVAB/ AFCT Mechanics Final Exam Study Questions.

BSEP ASVAB/ AFCT Mechanics Final Exam Study Questions. When a load is hoisted by means of the tackle shown above, the part that remains stationary is the - CORRECT ANSWER Because the upper block is connected to an immovable hook, it must remain stationary The figure above shows a cam and a valve. For each cam revolution, the vertical valve rise equals distance - CORRECT ANSWER The distortion of the cam causes the valve to rise when contact is made. The amount of this distortion is the length Y. If all valves are closed at the start, in order to have air pressure from the tank move the pistons to the right, the valves to be opened are - CORRECT ANSWER To move the pistons to the right, valves 1, 3, and 4 must be open. Valve 4 permits the air to enter the system; valve 3 allows the air to hit the left side of the piston; and valve 1 is an exhaust channel for the air. Automatic operation of a sump pump is controlled by the - CORRECT ANSWER When the water level rises past the safe area, the float turns on the sump pump. When the level of water in the sump goes down, the float also goes down and will shut off the sump pump. The figure above shows a governor on a rotating shaft. As the shaft speeds up, the governor balls will move - CORRECT ANSWER The centrifugal force acts to pull the balls outward. Since the two balls are connected to a yolk around the center bar, this outward motion pulls the balls upward The figure above shows a crank and piston. The piston moves from mid-position to the extreme right if the crank makes - CORRECT ANSWER The piston is now in part of the compression stroke; 14 turn will move it to full compression; 12 more turn will move it to the end of the power stroke. Adding 14+12=34 turn. Referring to the figure above, which one of the following statements is true? - CORRECT ANSWER To tighten the bolt, turn it counterclockwise. To tighten the nut on the bolt the reverse is true—turn it clockwise.