ASVAB Automotive Information Practice Test 452990

Questions 5
Topics Air-Fuel Mixture, Battery, Connecting Rod, Exhaust Stroke, Fluid Reservoir

Study Guide

Air-Fuel Mixture

The stoichiometric ratio defines the proper ratio of air to fuel necessary so that an engine burns all fuel with no excess air. For gasoline fuel, the stoichiometric ratio is about 14.7:1 or for every one gram of fuel, 14.7 grams of air are required. Too much air results in a lean air-fuel mixture that burns more slowly and hotter while too much fuel results in a rich mixture that burns quicker and cooler.

Battery

The battery supplies the power necessary to start the engine when the ignition switch is is turned on.

Connecting Rod

A connecting rod employs a wrist pin to link each piston to the engine's crankshaft.

Exhaust Stroke

During the exhaust stroke, just before the piston reaches bottom dead center the exhaust valve opens. The resulting gases from combustion are then pushed out through the exhaust valve as the piston travels up the cylinder to top dead center, completing stroke four of the four-stroke piston cycle.

Fluid Reservoir

The fluid reservoir stores the brake fluid that the master cylinder uses to maintain hydraulic pressure.