ASTB Mechanical Comprehension Exam
Questions and Answers 100% Pass
Which pulleys provide mechanical advantage? - ✔✔movable
Formula for gear revolutions - ✔✔r(revolutions) x d (number of teeth) = R x D
Pulley mechanical advantage - ✔✔number of parts of the rope that act on the load
Note about mechanical advantage: - ✔✔mechanical advantage is gained by combining a
fixed pulley with a moveable pulley or another fixed pulley of a different diameter
What are hydrometers? - ✔✔They use floats to measure specific gravity
What is specific gravity? - ✔✔the weight of a liquid compared with the weight of water.
the liquid with the highest specific gravity will cause the float to rise higher in the glass
tube
The lower the density of the substance... - ✔✔...the farther the hydrometer will sink.
first class lever - ✔✔fulcrum in the middle (scissors, pliers)
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, second class lever - ✔✔fulcrum is at one end, load is in between (nutcracker,
wheelbarrow)
third class lever - ✔✔fulcrum is at one end, effort is in between (tongs, tweezers)
Which turns faster? small or big pulley? - ✔✔smaller pulley will turn faster than those
larger than it. it has to "keep up" and therefore turns faster.
mechanical advantage in pistons - ✔✔a2 x d2 = a1 x d1
(smaller D)/(bigger D) = mechanical advantage
axe is a... - ✔✔wedge, which is an inclined plane
Fulcrum Resistance Arm Info? - ✔✔the farther away the fulcrum is from the resistance
arm, the greater the amount of force that is required to lift the weight and the higher the
resistance arm will travel
Voltimeter? - ✔✔Measures total voltage in a circuit
Does electricity flow through burnt out bulbs? - ✔✔No, but a voltimeter can bypass it if
connected on both sides.
Series: current and voltage - ✔✔current is constant in series, voltage is not
Parallel: current and voltage - ✔✔voltage is constant, current is not
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Questions and Answers 100% Pass
Which pulleys provide mechanical advantage? - ✔✔movable
Formula for gear revolutions - ✔✔r(revolutions) x d (number of teeth) = R x D
Pulley mechanical advantage - ✔✔number of parts of the rope that act on the load
Note about mechanical advantage: - ✔✔mechanical advantage is gained by combining a
fixed pulley with a moveable pulley or another fixed pulley of a different diameter
What are hydrometers? - ✔✔They use floats to measure specific gravity
What is specific gravity? - ✔✔the weight of a liquid compared with the weight of water.
the liquid with the highest specific gravity will cause the float to rise higher in the glass
tube
The lower the density of the substance... - ✔✔...the farther the hydrometer will sink.
first class lever - ✔✔fulcrum in the middle (scissors, pliers)
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, second class lever - ✔✔fulcrum is at one end, load is in between (nutcracker,
wheelbarrow)
third class lever - ✔✔fulcrum is at one end, effort is in between (tongs, tweezers)
Which turns faster? small or big pulley? - ✔✔smaller pulley will turn faster than those
larger than it. it has to "keep up" and therefore turns faster.
mechanical advantage in pistons - ✔✔a2 x d2 = a1 x d1
(smaller D)/(bigger D) = mechanical advantage
axe is a... - ✔✔wedge, which is an inclined plane
Fulcrum Resistance Arm Info? - ✔✔the farther away the fulcrum is from the resistance
arm, the greater the amount of force that is required to lift the weight and the higher the
resistance arm will travel
Voltimeter? - ✔✔Measures total voltage in a circuit
Does electricity flow through burnt out bulbs? - ✔✔No, but a voltimeter can bypass it if
connected on both sides.
Series: current and voltage - ✔✔current is constant in series, voltage is not
Parallel: current and voltage - ✔✔voltage is constant, current is not
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