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

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 161:

  An induction clutch works by ___________.

  A. magnetism
  B. pneumatics
  C. hydraulics
  D. friction
  A. magnetism

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  An induction clutch is a magnetic clutch.

• Question 162:

  The mechanical advantage of two meshing gears is calculated by dividing __________.

  A. the number of teeth on the driving gear by the number of teeth on the driven gear.
  B. the number of teeth on the driven gear by the number of teeth on the driving gear.
  C. the number of teeth on the driving gear by the rotational speed.
  D. the diameter of the driven gear by the number of teeth on the driving gear.
  B. the number of teeth on the driven gear by the number of teeth on the driving gear.

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  The mechanical advantage of two meshing gears is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.

• Question 163:

  

  When the block-and-tackle arrangement shown in the figure above is used to lift a load, all the following parts remain stationary EXCEPT __________.

  A. the upper hook
  B. the upper block
  C. the lower block
  D. none; all the parts move
  C. the lower block

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  All the listed parts remain stationary except the lower block.

• Question 164:

  Forces existing in pairs are sometimes called __________.

  A. action and interaction
  B. reaction and interaction
  C. action and reaction
  D. friction and gravity
  C. action and reaction

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  A force cannot be exerted unless there is something there to push back. Forces exist in pairs. For every action there is a reaction.

• Question 165:

  The ratio between work output and work input is called __________.

  A. efficiency
  B. work
  C. leverage
  D. mass
  A. efficiency

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  In order to find out how well work was performed and how much effort was expended in getting the job done, the term efficiency is used to describe the ratio of work input to work output.

• Question 166:

  

  When Cam A completes one revolution, the lever will touch the contact point __________.

  A. once
  B. never
  C. four times
  D. twice
  D. twice

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  When the high point of the cam connects with the lever arm, the lever arm will touch the contact point. Two high points on the cam mean the lever arm will touch the contact point twice with each revolution of the cam.

• Question 167:

  

  If Gear A is turned to the left __________.

  A. Gear B turns to the right and Gear C turns to the left.
  B. Gear B turns to the left and Gear C turns to the left.
  C. Gear B turns to the right and Gear C turns to the right.
  D. Gear B turns to the left and Gear C turns to the right.
  A. Gear B turns to the right and Gear C turns to the left.

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  Gears with their teeth together in mesh turn in opposite directions. Gear A turns Gear B in the opposite direction (right), and Gear B turns Gear C in the opposite direction (left).

• Question 168:

  

  The amount of force (F) needed to balance the lever in the figure above is most nearly ___________.

  A. 15 pounds
  B. 13 pounds
  C. 7.5 pounds
  D. 20 pounds
  B. 13 pounds

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  To determine the amount of force exerted by the cats, first multiply the length of the resistance arm (as it applies to the cat) by the weight of each cat and add the products together. The 10-pound cat is supported by the entire weight of the

  resistance arm, so 5 × 10 = 50. The 5-pound cat is being supported by 3 feet of the resistance arm, so 3 × 5 = 15.

  Add them up: 50 + 15 = 65.

  This number is equal to the length of the resistance arm times effort (force) or 65 = 5F. To isolate F, divide both sides by 5: 65 ÷ 5 = 5F ÷ 5 or 13 = F.

• Question 169:

  If you drop something, the force acting on it is ____________.

  A. gravity
  B. friction
  C. elastic recoil
  D. equilibrium
  A. gravity

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  Gravity is the force that pulls things down whenever they are dropped. It is said that Isaac Newton "discovered" the concept of gravity as an identifiable force while sitting under an apple tree and the obvious happened. Gravity is created by the mass of the earth. The pull of gravity is much less (about one-sixth) on the moon than on earth.

• Question 170:

  A compound machine is one in which __________.

  A. a battery provides the force
  B. one simple machine rotates around the second one
  C. two or more simple machines work together
  D. the mechanical advantages can be made to balance each other out
  C. two or more simple machines work together

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  A compound machine is one in which two or more simple machines work together.