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

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 81:

  

  For the valve shown in the figure above to open once each second, the cam must revolve at a rate of __________.

  A. 6 rpm
  B. 10 rpm
  C. 15 rpm
  D. 3 rpm
  A. 6 rpm

• Question 82:

  An aneroid barometer measures ___________.

  A. atmospheric pressure
  B. water pressure
  C. hydraulic-fluid pressure
  D. the ambient temperature
  A. atmospheric pressure

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  An aneroid barometer measures atmospheric pressure.

• Question 83:

  Presume that Pulley C is rotating clockwise.

  What direction will Pulley A rotate?

  

  A. Clockwise
  B. Counterclockwise
  C. Insufficient information to answer
  D. Pulley A will not rotate
  A. Clockwise

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  By rotating clockwise. Pulley C will cause Pulley B to rotate counterclockwise, which will in turn cause Pulley A to rotate clockwise.

• Question 84:

  The rate at which work is done is called __________.

  A. Power
  B. Effort
  C. Watts
  D. Horsepower
  A. Power

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  The English unit of power is foot pound per second. It takes 550 foot pounds to make 1 horsepower.

  The SI unit is the joule per second or watt. A horsepower is 746 watts.

  The rate at which work is done is called power. Power is work done per unit of time.

• Question 85:

  Weight is directly proportional to the acceleration due to ___________.

  A. friction
  B. elastic recoil
  C. viscous drag
  D. gravity
  D. gravity

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  Weight is not a fixed property of an object; it varies with location.

  Your weight is slightly less at the North Pole than it is at the equator. Your weight is much less on the moon than on earth.

  Everything weighs less where the acceleration due to gravity is smaller.

  Weight is directly proportional to local acceleration due to gravity.

• Question 86:

  

  In the figure above, if the fulcrum supporting the lever is moved closer to the cat, the cat will be __________.

  A. easier to lift and will move higher
  B. harder to lift but will move higher
  C. easier to lift but will not move as high
  D. harder to lift and will not move as high
  C. easier to lift but will not move as high

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  If the fulcrum is moved closer to the cat, the length of the effort arm of the lever will be increased, making the cat easier to raise, but the height to which the cat can be raised will be reduced.

• Question 87:

  A concrete beam has a maximum strength of 3,000 psi (pounds per square inch). In an experiment, a 500-pound weight is placed in the center of the beam, and the stress in the beam is measured to be 1,000 psi. If the stresses in the beam continue to increase at the same rate with added weight, how much additional weight can be added to the same location on the beam before the beam will break?

  A. 500 pounds
  B. 1,000 pounds
  C. 1,500 pounds
  D. 3,000 pounds
  B. 1,000 pounds

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  The first 500 pounds generated 1,000 psi of stress in the beam; therefore, 500 more pounds will increase the total stress to 2,000 psi.

  Another 500 pounds will increase the stress to 3,000 psi, which we are told is the maximum strength of the beam.

  Therefore, the maximum additional load that can be applied to this beam before it breaks is 1,000 pounds.

• Question 88:

  Pulley systems require the synchronized movement of all pulleys.

  How can pulleys escape this rule?

  A. To violate this rule, pulley systems may be used in conjunction with gears.
  B. This rule cannot be effectively violated.
  C. To violate this rule, pulley system belts must be reversed.
  D. Pulleys using twisted belts may move in opposing directions.
  D. Pulleys using twisted belts may move in opposing directions.

• Question 89:

  

  Pulling on the rope at point A will lift the load.

  How far will you have to pull the rope at point A to lift the load 15 feet?

  A. 15 feet
  B. 45 feet
  C. 30 feet
  D. 60 feet
  B. 45 feet

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  The mechanical advantage of the pulley is 3 since there are three ropes supporting the load. Therefore, the distance at point A needs to 3x or 3 × 15 = 45 ft.

• Question 90:

  

  Which of the following is an example of a Class 2 Lever?

  A. Fishing rod
  B. Bottle opener
  C. See-Saw
  D. Scissors
  B. Bottle opener

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  A bottle opener is a single class 2 lever.

  A see-saw and scissors are class 1 levers.

  A Fishing rod is a class 3 lever.