Mechanical Aptitude Ultimate 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 Ultimate flashcards as text
A fixed pulley attached to the ceiling is used to lift a 200 lb load. How much force must be applied to the rope?
Answer: 200 lbs
A single fixed pulley only changes the direction of force, not the magnitude, so you still need 200 lbs of pull.
What causes a steel bridge to have expansion joints?
Answer: Steel expands and contracts with temperature changes
Steel expands when heated and contracts when cooled; expansion joints accommodate this dimensional change and prevent buckling or cracking.
In a V-belt drive system, what is the main advantage of a V-belt over a flat belt?
Answer: Wedging action in the groove increases friction and reduces slipping
The V-shape wedges into the pulley groove, creating greater contact friction and allowing more torque transmission with less slipping.
A screw with a pitch of 0.05 inches is turned 10 full rotations. How far does it advance linearly?
Answer: 0.5 inches
Linear advance = pitch × number of rotations = 0.05 × 10 = 0.5 inches.
Which valve type is best suited for fully open or fully closed service (not for throttling)?
Answer: Gate valve
Gate valves are designed for isolation service (fully open or closed) because throttling causes erosion of the gate and seat.
Two gears mesh together. Gear A has 15 teeth and Gear B has 45 teeth. If Gear A drives Gear B, what is the torque multiplication factor?
Answer: 3×
Torque ratio = driven teeth / driver teeth = 45/15 = 3, so the output torque is tripled at the cost of reduced speed.
A steel rod is heated until it glows red and then quickly plunged into cold water. This process is called:
Answer: Quenching
Quenching is the rapid cooling of heated metal in water, oil, or air to harden it by locking in a martensitic structure.