Mechanical Aptitude Mechanical Aptitude Ultimate 3

Question 1

A fixed pulley attached to the ceiling is used to lift a 200 lb load. How much force must be applied to the rope?

Accepted Answer

200 lbs

Answer

A single fixed pulley only changes the direction of force, not the magnitude, so you still need 200 lbs of pull.

Question 2

What causes a steel bridge to have expansion joints?

Accepted Answer

Steel expands and contracts with temperature changes

Answer

Steel expands when heated and contracts when cooled; expansion joints accommodate this dimensional change and prevent buckling or cracking.

Question 3

In a V-belt drive system, what is the main advantage of a V-belt over a flat belt?

Accepted Answer

Wedging action in the groove increases friction and reduces slipping

Answer

The V-shape wedges into the pulley groove, creating greater contact friction and allowing more torque transmission with less slipping.

Question 4

A screw with a pitch of 0.05 inches is turned 10 full rotations. How far does it advance linearly?

Accepted Answer

0.5 inches

Answer

Linear advance = pitch × number of rotations = 0.05 × 10 = 0.5 inches.

Question 5

Which valve type is best suited for fully open or fully closed service (not for throttling)?

Accepted Answer

Gate valve

Answer

Gate valves are designed for isolation service (fully open or closed) because throttling causes erosion of the gate and seat.

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