Mechanical Aptitude Principles Flashcards
7 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical Aptitude Principles flashcards as text
A hydraulic jack uses a small piston with area 2 in² and a large piston with area 20 in². If you apply 50 lbs on the small piston, what force does the large piston exert?
Answer: 500 lbs
Pascal's Law states force is multiplied by the ratio of piston areas: 50 × (20/2) = 500 lbs.
Which type of gear changes rotational motion into linear motion?
Answer: Rack and pinion
A rack and pinion converts the rotary motion of the pinion into the linear motion of the rack.
A 10-foot board is balanced on a fulcrum. A 200 lb person sits 2 feet from the fulcrum. How far from the fulcrum must a 100 lb person sit to balance?
Answer: 4 feet
Torque balance: 200 × 2 = 100 × d, so d = 4 feet.
What happens to the pressure in a fluid when its velocity increases through a constriction?
Answer: Pressure decreases
Bernoulli's principle states that as fluid velocity increases, its pressure decreases.
A wedge is used to split a log. The wedge has a narrow angle. Compared to a wide-angle wedge, the narrow wedge requires:
Answer: Less force but travels farther
A narrower wedge angle provides greater mechanical advantage, requiring less force over a longer stroke.
Two gears are meshed together. Gear A has 12 teeth and Gear B has 36 teeth. If Gear A spins at 300 RPM, how fast does Gear B spin?
Answer: 100 RPM
Speed ratio is inverse of tooth ratio: 300 × (12/36) = 100 RPM.
Which property of a material describes its ability to return to its original shape after a force is removed?
Answer: Elasticity
Elasticity is the property that allows a material to recover its original shape after deformation.