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 The figure above represents a pipe through which water is flowing in the direction of the arrow. There is a constriction in the pipe at the point indicated by the number 2. Water is being pumped into the pipe at a constant rate of 350 gallons per minute. Of the following, the most accurate statement is that a. the velocity of the water at point 2 is the same as the velocity of the water at point 3. b. a greater volume of water is flowing past point 1 in a minute than is flowing past point 2. c. the volume of water flowing past point 2 in a minute is the same as the volume of water flowing past point 1 in a minute. |
answer is C. The volume of water flowing at points 1, 2, and 3 must be the same because of the conservation of mass: mass in = mass out. Also, since no water is added or removed after point 1, there cannot be any change of volume.
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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 move nut
a. C toward the right. b. C toward the left. c. B up. |
answer is A. 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
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The reading of the voltmeter should be
a. 600 b. 120 c. 0 |
answer is A. No electricity flows through a burned-out bulb. However, the voltmeter acts as a bypass around the burned-out bulb and is therefore connected in series. It measures all of the voltage in the circuit. The voltage is 600 volts.
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In the figure shown above, one complete revolution of the sprocket wheel will bring weight W2 higher than weight W1 by
a. 24 inches. b. 36 inches. c. 48 inches. |
answer is C. The circumference of the wheel is 24 inches. One complete revolution will raise W2 24 inches and lower W1 24 inches, a difference of 48 inches.
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At which point was the basketball moving slowest?
a. A b. B c. C |
answer is C. The vertical component of the momentum of the ball is zero only at position C.
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If pulley D is the driver in the arrangement of pulleys shown above, the pulley that turns slowest is
a. A b. B c. C |
answer is A. Pulley A has the largest circumference. In the arrangement shown, pulley A turns slowest.
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A 150-pound person jumps off a 600-pound raft to a point in the water 10 feet away. Theoretically, the raft would move in the opposite direction a distance of
a.  feet.b. 3 feet. c.  feet. |
answer is A. Let x = theoretical distance moved in the opposite direction.
10 * 150= x * 600 600x= 1500 x= 1500/600 x= 2.5 |
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If cam A makes 120 complete turns per minute, the setscrew will hit the contact point
a. once each second. b. twice each second. c. four times each second. |
answer is B. Note that with each complete turn of the cam, the setscrew will hit the contact point once
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As shown in the figure above, four air reservoirs have been filled with air by the air compressor. If the main gauge reads 150 pounds, then the tank air gauge will read
a. 50 pounds. b. 75 pounds. c. 150 pounds |
answer is C. The pressure is uniform in the system given. If the main line air gauge reads 150 pounds, the tank air gauge will also read 150 pounds.
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Which of the angles is braced most securely?
a. A b. B c. C |
answer is C. As brace C has the greatest area support, it is the most secure.
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The amount of gas in the balloons is equal. The atmospheric pressure outside the balloons is lowest on which balloon?
a. A b. B c. C |
answer is C. The greater the pressure outside the balloon, the less expansion within the balloon; the less pressure, the greater the expansion.
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In the figure shown above, X is the driver gear and Y is the driven gear. If the idler gear is rotating clockwise,
a. gear X and gear Y are rotating clockwise. b. gear X and gear Y are rotating counterclockwise. c. gear X is rotating clockwise, while gear Y is rotating counterclockwise. |
answer is B. When two external gears mesh, they rotate in opposite directions. To avoid this, an idler gear is put between the driver gear and the driven gear.
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The figure shown above represents a water tank containing water. The number 1 indicates an intake pipe and 2 indicates a discharge pipe. Which of the following statements is correct?
a. The tank will eventually overflow if water flows through the intake pipe at a slower rate than it flows out through the discharge pipe. b. The tank will empty completely if the intake pipe is closed and the discharge pipe is allowed to remain open. c. The water in the tank will remain at a constant level if the rate of intake is equal to the rate of discharge. |
answer is C. The tank would overflow only if water flows through the intake pipe at a faster, not slower, rate. The water in the tank would remain at a constant level if rate of intake is equal to rate of discharge. The tank cannot empty completely, as the discharge pipe is not located at the tank's bottom.
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If the float in the tank develops a bad leak, then the
a. flow of fuel will stop. b. float will stay in the position shown. c. needle value will remain in the open position. |
answer is C. If the float in the tank develops a bad leak, it will fill with water and submerge. This will elevate the needle valve causing it to remain in an open position.
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The maximum weight, W, that can be lifted as shown with a pull of 100 pounds is
a. 100 pounds. b. 200 pounds. c. 300 pounds. |
answer is B. The number of parts of the rope going to and from the movable block indicates a mechanical advantage of 2. Accordingly, a 100-lb. pull can lift, theoretically, a 200-lb. weight.
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