Mechanical Aptitude FREE Mechanical Aptitude Ultimate Question and Answers 3

Question 1

A wheelbarrow is an example of which class of lever?

Accepted Answer

Second-class lever

Answer

A wheelbarrow places the load between the fulcrum (wheel) and the effort (handles), which defines a second-class lever.

Question 2

Two meshing gears have 15 and 45 teeth respectively. If the smaller gear rotates at 900 RPM, how fast does the larger gear rotate?

Accepted Answer

300 RPM

Answer

Gear speed is inversely proportional to the number of teeth, so the larger gear turns at 900 × (15/45) = 300 RPM.

Question 3

A pipe with a 1-inch diameter narrows to a 0.5-inch diameter. According to the continuity principle, what happens to the fluid velocity in the narrower section?

Accepted Answer

It increases by a factor of 4

Answer

Flow rate is constant, and since area is proportional to the square of diameter, halving the diameter reduces area by a factor of 4, so velocity increases by a factor of 4.

Question 4

Which of the following materials would be the best conductor of heat?

Accepted Answer

Copper

Answer

Copper has one of the highest thermal conductivities of common materials, making it an excellent heat conductor.

Question 5

A screw has 8 threads per inch. What is the mechanical advantage if the screwdriver handle has a circumference of 4 inches?

Accepted Answer

32

Answer

The mechanical advantage of a screw equals the handle circumference divided by the pitch; with 8 threads per inch the pitch is 1/8 inch, so MA = 4 ÷ (1/8) = 32.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude FREE Mechanical Aptitude Ultimate Question and Answers 3