ASVAB ASVAB-SECTION-3 Online Practice Questions and Exam Preparation

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 31:

  

  In the figure, the angle b is important, since when it is __________.

  A. 0 degrees the entire force is dragging the box
  B. 90 degrees the entire force is lifting the box
  C. both lifting and dragging between 10 degrees and 90 degrees
  D. all of the above
  D. all of the above

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  The angle of the rope determines if the box is being pulled along the floor or being lifted from the floor.

  That means it can be both lifted and pulled along at any angle that is more than 0 degrees and less than 90 degrees.

• Question 32:

  The wheels below are connected by a belt as shown.

  If the larger wheel makes two revolutions, how many revolutions will the smaller wheel make?

  

  A. Less than one
  B. One
  C. Two
  D. More than two
  D. More than two

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  We are not told the sizes of the two wheels, but we can see that one is larger than the other.

  If the two wheels are connected by a belt, the small wheel will be forced to turn fester and complete more turns than the larger wheel.

• Question 33:

  If you want to hammer in a heavy nail, it might be a good idea to use a hammer with a __________.

  A. lighter head
  B. heavy head
  C. longer handle
  D. shorter handle
  C. longer handle

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  A longer handle – a longer lever – allows the hammerhead to reach a higher speed, thereby producing more striking force.

• Question 34:

  

  If Gear A is revolving in a clockwise manner, as seen in the figure above, Gear B ___________.

  A. remains stationary
  B. revolves in a clockwise manner
  C. revolves in a counterclockwise manner
  D. turns more slowly than Gear A
  C. revolves in a counterclockwise manner

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  Meshed gears always turn in opposite directions.

• Question 35:

  The amount that a machine (simple or complex) multiplies your force or effort is called __________.

  A. load distance
  B. mechanical advantage
  C. resistance effect
  D. acceleration
  B. mechanical advantage

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  The amount that a machine (simple or complex) multiplies your force or effort is called mechanical advantage.

  Load distance is how far the load moves when force is applied, and acceleration is the change in velocity or speed in a certain direction.

• Question 36:

  

  In the figure above, if Gear 1 has 25 teeth and Gear 2 has 15 teeth, how many revolutions does Gear 2 make for every 10 revolutions Gear 1 makes?

  A. about 16 2/3
  B. 12
  C. about 1/3 more
  D. about 20
  A. about 16 2/3

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  To determine the answer, multiply the number of teeth Gear 1 has D and the number of revolutions it makes (R). Divide that number by the number of teeth Gear 2 has D to determine the number of revolutions Gear 2 makes (r). Because the gears are proportional, this formula will show you the ratio of teeth to revolutions. r = DR/d r = (25 × 10)/15 r = 250⁄15, or 1610⁄15, or 162/3

• Question 37:

  Which of the following will happen when a mass of air contracts?

  A. The air remains at the same temperature
  B. The air gets colder
  C. The air gets warmer
  D. The air moves faster
  B. The air gets colder

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  Air is a gas. According to the gas laws, gasses will get colder when they contract.

• Question 38:

  

  The try-cock in the schematic above measures ___________.

  A. temperature of water
  B. pressure of water
  C. pressure of steam buildup
  D. level of water
  D. level of water

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  Try-cocks measure water level. Water seeks a level throughout a system, so in the schematic, the try-cock correctly indicates the water level.

• Question 39:

  How can a gear system derive the greatest amount of mechanical advantage when a seven-tooth gear drives a ___________?

  A. 29-tooth gear
  B. 5-toothgear
  C. 24-tooth gear
  D. 17-tooth gear
  A. 29-tooth gear

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  The greater the difference between the number of teeth of the two meshed gears, the greater the torque or mechanical advantage.

• Question 40:

  Which of the following would feel hottest at one end if the other end were placed over a fire?

  A. A metal skewer
  B. A wooden stick
  C. A plastic rod
  D. A rubber stick
  A. A metal skewer

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  Of the four materials, metal is the best conductor of heat, so a metal skewer would feel the hottest.