Gear & Ratio understanding

Gears are essential to the operation of any vehicle. Where are gears primarily found on a vehicle?

• In the wheels

• In the engine, transmission, and drive axle

• In the seats

• In the exhaust system

What is the basic function of a gear?

• To transfer torque and motion from a rotational input to a rotational output.

• To convert electrical energy into mechanical energy.

• To store energy for later use.

• To measure the speed of rotation.

Gears can be used to gain mechanical advantage to either increase output power, increase output speed, or simply to transfer torque and motion unchanged.

• True

• False

In wooden peg gears, how are the pegs installed on one wheel of wood?

• Parallel to its axis

• Perpendicular to its axis

• At an angle to its axis

• Randomly

The intermeshed pegs of the driving wheel caused the driven wheel to turn. Motion could be transferred in this way.

• True

• False

In medium- and heavy-duty vehicles, gears are typically made from ______ or cast ductile iron.

• steel

• aluminum

• plastic

• copper

What is the term for the distance from the base of one gear tooth to the base of the opposite tooth?

• Whole Depth

• Pitch Circle

• Addendum

• Dedendum

The upper portion of the tooth contact area is called the ________ and the lower portion of the contact area is called the dedendum.

• addendum

• pendulum

• modulus

• spectrum

The root diameter of a gear is the smallest circle of the gear measured at the ________ radius, or root, of the teeth.

• fillet

• pitch

• addendum

• dedendum

The pitch circle is the theoretical point where the sliding motion coming into mesh stops and only ________ motion exists.

• rolling

• vibrating

• oscillating

• translating