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MECHANICAL REASONING
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A)Post A The weight is distributed more on the side of post A, Therefore, it is holding up the greatest part of the load. Which post holds up the greater part of the load? A- Post A B- Post B C- Both equal D- Not clear C)Neither of the other gears Because of the way the gears are meshed, both gear 1 and gear 3 will move in the opposite direction of gear 2. Which of the other gears is moving in the same direction as gear 2? A) Gear 1 B) Gear 3 C) Neither of the other gears D) Both of the other gears
A)A
Pulley A is the smallest gear. Therefore, it must turn faster (make more revolutions per minute). In this arrangement of pulleys, which pulley turns fastest? A) A B) B C) C D) D A)Once The single lobe on cam A will cause the setscrew to hit the contact point once during the cam's revolution. As cam A makes one complete turn in the figure above, the setscrew will hit the contact point A) Once B) Twice C) Three Times D) Not At All A) Since gear A has 15 teeth and gear B has 10 teeth, gear A is 1.5 the size of gear B. Therefore, 14 x 1.5 =
When gear A makes 14 revolutions, how many revolutions will gear B make? A) 21 B) 17 C) 14 D) 9
B)32 gallons per minute The volume is dependent on the area of the outlet. Since A = πr² and r = d/2 , then A= π(d²/4) where A is the area and d is the diameter. The volume is proportional to the diameter squared ( d² ). When the volumes of the 1-inch and 2-inch outlets are compared, we see that the latter will produce 4 times as great a volume. If the 1-inch outlet has an 8-gallon flow, then the 2-inch outlet will have a 32-gallon flow. Eight gallons of water per minute are flowing at a given time from the 1-inch outlet in the tank shown above. What is the amount of water flowing at that time from the 2-inch outlet? A) 64 gallons per minute B) 32 gallons per minute C) 16 gallons per minute D) 2 gallons per minute A) C toward the right If nut A were removed, it would be necessary to move nut C to the right to counterbalance the loss of the weight of nut A.
- The arm in the figure above is exactly balanced as shown. If nut A is removed entirely, then, in order to rebalance the arm, it will be necessary to turn nut A) C toward the right B) C toward the left C) B up D) B down
B) Relieve the air from steam radiators. An air valve on a radiator removes air from the steam pipes. If air is trapped in the pipes, it prevents the steam from going to the radiator. This would prevent the radiator from producing heat. The purpose of an air valve in a heating system is to A) Prevent pressure from building up in a room due to the heated air. B) Relieve the air from steam radiators. C) Allow excessive steam pressure in the boiler to escape to the atmosphere. D) Control the temperature in the room. A) 1/4 turn Each time the rotating arm makes a complete revolution, it moves the slotted disc 1/4th of a turn.
- The figure above shows a slotted disc turned by a pin on a rotating arm. One revolution of the arm turns the disc A) 1/4 turn B) 1/2 turn C) 3/4 turn D) 1 complete turn B) Bend the strips The figure shown is a bimetallic strip that works like the wire in a thermostat. High temperatures will cause the metals to heat unevenly. The rivets will keep the strips together, so the only thing that they can do is bend.
- The figure above shows a brass and an iron strip continuously riveted together. High temperatures would probably A) Have no effect at all B) Bend the strips C) Separate the strips D) Shorten the strips
When the 100-pound weight is being slowly hoisted up by the pulley, as shown in the figure above, the downward pull on the ceiling to which the pulley is attached is A) 50 pounds B) 100 pounds C) 150 pounds D) 200 pounds B) Turn Slower Imagine the driven wheel as a record. For one rotation of the record, point Y travels much farther than point X. It takes more more turns of the driver wheel to turn point Y one complete revolution. When the driver wheel in the figure above is moved location X to location Y, the driven wheel will A) Reverse its direction of rotation B) Turn Slower C) Not change its speed of rotation D) Turn faster B) 175 pounds The diameter of 3½ times (28/8) the diameter of the axel. When 50lbs of force is applied to the handle, it is multiplied by 3½ times, or 28/8x50=175lbs In the diagram above, the axle 8 inches in diameter has attached a handle of 28 inches in diameter. If the force of 50 pounds is applied to the handle, the axle will lift a weight of A) 224 pounds B) 175 pounds C) 200 pounds D) 88 pounds
A) Provide for changes in length of heated pipe When steam flows through pipes, it expands. The pipes would burst if extra space were not provided for the expansion and contraction. The main purpose of expansion joints in steam lines is A) Provide for changes in length of heated pipe B) Allow for connection of additional radiators C) Provide locations for valves D) Reduce breakage of pipe due to minor movement of the building frame B) 36 pounds Let Y= effort that must be exerted Step1 60x3=Yx Step2 180=5Y Step3 Y=180/ Step4 Y= What effort must be exerted to lift a 60 pound weight in the figure of the first class lever shown above(disregard the weight of the lever in your computation)? A) 30 pounds B) 36 pounds C) 45 pounds D) 60 pounds A) Rise 1 gallon per minute The water is filling up in the tank at a rate of 120 gallons per hour, or 2 gallons per minute (120/60=2). The tank is also emptying at a rate of 1 gallon per minute. The net flow is increasing at 1 gallon per minute, because 2gal minus 1gal= 1 gallon per minute increase. If water is flowing into the tank shown above at the rate of 120 gallons per hour and flowing out of the tank at a constant rate of 1 gallon per minute, the water level in the tank will A) Rise 1 gallon per minute
B) B
C) C
D) All 3 require the same force A) Study the diagram and not that the follower is at its highest position between points Q and R. In the figure above, the follower is at its highest position between points A) Q and R B) R and S C) S and T D) T and Q B) If the head of the bolt is held stationary and the nut is turned clockwise the nut will move down. Clockwise is right to left, so if the nut moves, it follows the threads of the bolt downward. Which of the following statements is true about the figure above? A) If the nut is held stationary and the head turned clockwise the bolt will move up. B) If the head of the bolt is held stationary and the nut is turned clockwise the nut will move down. C) If the head of the bolt is stationary and the nut is turned clockwise the nut will move up. D) If the nut is held stationary and the bolt it turned counterclockwise the nut will move up D) Swing away from the tuning fork When the tuning fork vibrates it moves currents of air. This vibrating air would cause the ping pong ball to be pushed away.
When the tuning fork shown above is struck the ping pong ball will A) Remain Stationary B) Bounce up and down C) Hit the tuning fork D) Swing away from the tuning fork C) Be enlarged The film of water inside the loop would form a lens that would enlarge the printing on the page. If you look through a water filled globe, objects will also appear larger. The print in the figure above looked at through the film of water will A) Be too blurred to read B) Look the same as surrounding print C) Be enlarged D) Appear smaller B) Rise in the air If the man moves to the back of the seesaw, his momentum (weight x distance from the center) will increase. The woman, who is lighter will rise in the air. In the illustration above, if the man backs to the end of the seesaw, the women will A) Remain stationary B) Rise in the air C) Hit the ground hard D) Slide to her end of the seesaw
The distortion of the cam causes the valve to rise when contact is made. The amount of this distortion is the length Y. The figure above shows a cam and a valve. For each cam revolution, the vertical valve rose equals distance A) Y B) X C) X plus Y D) Twice X D) 1, 3, and 4 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 air. 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 A) 2 and 4 B) 2, 3, and 4 C) 1 and 2 D) 1, 3, and 4 B) Float When the water level rises past the safe area, the float turns on the sump pump. When the lever of water in the sump pump goes down, the float also goes down and will shut off the sump pump. Extra Note: Sump pumps are devices that are placed in a basement designed to pump out excess water that would otherwise cause significant flooding. They are almost always put in the lowest point in the floor and often placed in their own specially dug pit. Automatic operation of a sump pump is controlled by the A) Pneumatic Switch B) Float
C) Foot Valve D) Centrifugal Driving Unit C) Upward 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 governor on a rotating shaft. As the shaft speeds up, the governor balls will move A) Down B) Upward and Inward C) Upward D) Inward B) 3/4 turn The piston is now in part of the compression stroke; 1/4 turn will move it to full compression; 1/2 more turn will move it to the end of the power stroke. Adding 1/4 + 1/2 = 3/4 turn. The figure above shows a crank and piston. The piston moves from midposition to the extreme right if the crank makes A) 1/2 turn B) 3/4 turn C) 1 turn D) 1 1/2 turns C) If the head of the bolt is stationary and the nut is turned clockwise, the nut will move up.
B) 45°
There are 8 holes in the circular cross-section of the flanged pipe. A;; circles have 360°. Thus each hole is separated by 360°/8 or 45° In the case of the standard flanged pipe shown above, the maximum angle through which it would be necessary to rotate the pipe in order to line up the holes is A) 22.5° B) 45° C) 30° D) 60° C) 10 The sum of the moments must be zero. Summing around the fulcrum we have: (6ft x 5lbs) + (3ft x 10lbs) = 6ft x F Combining terms, we get: 60(ft-lbs)=6ft x F Dividing both sides by 6: 10lbs=F The force F needed to balance the lever shown above is, in pounds, most nearly A) 7. B) 12. C) 10 D) 15
