ASVAB Auto and Shop: Vehicle Braking, Cooling, and Electrical Systems

Question 1

Which principle explains how pressing the brake pedal transmits force through brake fluid to the wheel cylinders or calipers?

Accepted Answer

Pascal's law

Answer

Pascal's law states that pressure applied to a confined fluid is transmitted equally in all directions. Hydraulic braking systems use this principle: foot pressure on the pedal pressurizes brake fluid, which multiplies the force at each wheel.

Question 2

What is the primary function of the thermostat in a vehicle's cooling system?

Accepted Answer

To regulate coolant flow based on engine temperature

Answer

The thermostat is a temperature-sensitive valve that stays closed when the engine is cold (keeping coolant in the engine to warm up quickly) and opens when the engine reaches operating temperature to allow coolant to flow to the radiator.

Question 3

Which vehicle component converts mechanical energy from the engine into electrical energy to recharge the battery while the vehicle is running?

Accepted Answer

Alternator

Answer

The alternator is a generator driven by the engine's serpentine belt. It produces AC electricity, which is converted to DC to charge the battery and power the vehicle's electrical systems while running.

Question 4

Disc brakes use which component to squeeze against the rotor and create stopping friction?

Accepted Answer

Brake caliper and pad

Answer

In a disc brake system, the caliper clamps brake pads against both sides of the spinning rotor (disc). This friction slows wheel rotation. Drums and shoes are found in drum brake systems, not disc systems.

Question 5

What is the purpose of a vehicle's radiator?

Accepted Answer

To transfer heat from the coolant to the surrounding air

Answer

The radiator is a heat exchanger. Hot coolant flows through its tubes while air passes over fins surrounding those tubes, removing heat from the coolant before it recirculates back into the engine.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Auto and Shop: Vehicle Braking, Cooling, and Electrical Systems