CBST Mechanical Reasoning Flashcards
6 cards from real CBST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CBST Mechanical Reasoning flashcards as text
A ramp 10 feet long raises a load 2 feet high. What is the mechanical advantage of this inclined plane?
Answer: 5
The mechanical advantage of an inclined plane is the length divided by the height: 10 ÷ 2 = 5.
An electric motor draws 10 amps at 120 volts. What is its power consumption?
Answer: 1,200 watts
Power (watts) = Voltage × Current = 120 × 10 = 1,200 watts.
If a spring is compressed to half its natural length, what happens to the elastic potential energy stored?
Answer: It quadruples
Elastic potential energy = ½kx², so doubling the compression (from half to full) quadruples the energy stored.
A flat-head screwdriver is being used as a pry bar. What simple machine principle does this represent?
Answer: A lever
When used as a pry bar, the screwdriver acts as a lever with the edge of the object serving as the fulcrum.
Which of the following best explains why a thermostat uses a bimetallic strip?
Answer: Different metals expand at different rates when heated
A bimetallic strip bends when heated because the two bonded metals have different coefficients of thermal expansion.
A car engine uses a flywheel. What is the primary function of a flywheel?
Answer: To store rotational energy and smooth out power delivery
A flywheel stores kinetic energy during power strokes and releases it between strokes, providing smooth, continuous rotation.
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