Applied Technology Flashcards

A drive gear with 20 teeth meshes with a driven gear with 40 teeth. If the drive gear rotates at 60 RPM, what is the speed of the driven gear?

Answer: 30 RPM

The driven gear speed equals the drive gear speed multiplied by the inverse gear ratio: 60 × (20/40) = 30 RPM.

In an electrical circuit, which configuration allows current to flow through multiple separate paths simultaneously?

Answer: Parallel circuit

A parallel circuit provides multiple independent paths for current, so electricity can flow through each branch simultaneously.

A hydraulic piston has an area of 3 square inches and the system pressure is 400 PSI. What force does the piston exert?

Answer: 1,200 lbs

Force equals pressure multiplied by area: F = 400 PSI × 3 in² = 1,200 lbs.

A lever has a 12-foot effort arm and a 3-foot resistance arm. What is its mechanical advantage?

Answer: 4

Mechanical advantage of a lever equals the effort arm length divided by the resistance arm length: 12 ÷ 3 = 4.

Which material is the best conductor of electricity among the following options?

Answer: Copper

Copper has very low electrical resistance and free electrons that move easily, making it an excellent conductor used widely in wiring.

A single fixed pulley attached to a ceiling is used to lift a load. What does the pulley provide?

Answer: Changes direction of force only

A single fixed pulley only redirects force (downward pull becomes upward lift) without providing any mechanical advantage.

When a pipe gradually narrows, what happens to the velocity of the fluid flowing through it?

Answer: Velocity increases

According to the continuity principle, fluid must speed up as it passes through a narrower cross-section to maintain the same flow rate.