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PART IV: PRACTICE EXAMINATIONS
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83 A 600-pound weight is placed on the end of a plank 2 feet from a fulcrum To obtain equilibrium, how much effort (force) would a re ghter have to exert on the opposite end of the plank which is 10 feet from the fulcrum (A) 100 pounds (B) 120 pounds (C) 150 pounds (D) 200 pounds
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84 A lever system as shown above has a mechanical advantage of 4 If an effort (force) is applied at a distance 1 foot from the fulcrum what is the resistance force (load) distance (A) 4 feet (B) 1 foot (C) 4 inches (D) 3 inches
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85 The transfer of energy through motion is called (A) mass (B) weight (C) work (D) length
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86 A hose reel has a handle attached to a 1-inch radius axle The turning circumference of the handle is 12 inches How much force is required to lift three lengths of hose weighing 100 pounds (A) 43 pounds (B) 52 pounds (C) 68 pounds (D) 74 pounds
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87 A pulley system is used to lift a 1,500-pound load The system applies an effort (force) of 500 pounds The mechanical advantage of the pulley system is (A) 3 (B) 2 (C) 1 (D) 0
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88 If the resistance force (load) of an object is 2,400 pounds, what would be the effort (force) required by a wedge with a mechanical advantage of 6 to lift it (A) 1,400 pounds (B) 1,200 pounds (C) 800 pounds (D) 400 pounds
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89 The circumference of a screw multiplied by the number of times it is turned is equal to its effort (force) A screw with a circumference of 7 mm is turned six times, causing it to move through a piece of gypsum board a distance of 3 mm What is the mechanical advantage of the screw (A) 14 (B) 7 (C) 6 (D) 3
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PRACTICE EXAM IV
16T 12T
32T 16T 32T
D C E
90 In the gear drive system shown in the gure above, how does gear E compare to driver gear A (A) (B) (C) (D) It rotates faster in the opposite direction It rotates faster in the same direction It rotates more slowly in the opposite direction It rotates more slowly in the same direction
14 feet
2 feet 4 inches
91 The inclined plane in the gure above has a mechanical advantage of (A) 8 to 1 (B) 7 to 1
Block
(C) 6 to 1 (D) 5 to 1
Line #1
30 lbs
Tackle Load
92 In the block and tackle pulley system in the gure above, a pull equal to 30 pounds applied to line #1 will be able to lift how much weight (A) 90 pounds (B) 180 pounds (C) 270 pounds (D) 360 pounds
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PART IV: PRACTICE EXAMINATIONS
93 The mechanical advantage of a xed pulley system is (A) 4 (B) 3 (C) 2 (D) 1
94 In a xed pulley system, if the effort (force) is applied in a downward direction, the load being lifted will travel (A) (B) (C) (D) in the same direction in the opposite direction in either the same or opposite direction perpendicular to the effort (force) being applied
95 A wheelbarrow holds a load weighing 40 pounds The load is 18 inches from the wheels How much effort (force) is required to lift the load if the handles of the wheelbarrow are 36 inches from the load (A) 40 pounds (B) 30 pounds (C) 20 pounds (D) 10 pounds
96 In question 95 above, what is the mechanical advantage of the wheelbarrow (A) 4 to 1 (B) 3 to 1 (C) 2 to 1 (D) 1 to 1
97 An example of a third class lever is a (A) broom (B) bottle opener (C) bellows (D) nutcracker
98 A pulley system lifts 160 pounds with an effort (force) of 40 pounds The pulley rope where the effort (force) is being applied moves 4 inches How many inches does the load move (A) 1 inch (B) 4 inches (C) 8 inches (D) 16 inches
99 A pulley system has a mechanical advantage of 4:1 What is the ef ciency of the system if the rope end where effort (force) is being applied moves 10 inches while the load is lifted 2 inches (A) 50% (B) 65% (C) 75% (D) 80%
100 How much force is required to roll a 250 N barrel up an inclined plane that is 5 meters in length to a platform 2 meters in height (A) 125 N (B) 100 N (C) 80 N (D) 75 N
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