Helical Gears Are Being Discussed

question 42

Multiple Choice

Helical gears are being discussed. Technician A says helical gears are used in modern transmissions because they don't produce axial thrust. Technician B says in a helical gearset two or more teeth mesh at the same time, which distributes tooth load and produces a very strong gear. Who is correct?

• A)A only
• B)B only
• C)both A and B
• D)neither A nor B

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Definitions:

Free Radical Bromination

A chemical reaction where bromine radicals substitute hydrogen atoms in hydrocarbons.

Hammond Postulate

The Hammond postulate suggests that the transition state of a reaction resembles the structure of the closest stable species on the reaction path, either the products or the reactants.

Transition State

The highest-energy state during a chemical reaction where the reactants are transformed into products, representing the point of highest energy on a reaction coordinate.

Endothermic Reaction

A chemical reaction that absorbs heat from its surroundings.