ASVAB Automotive Information Practice Test 769440 Results

Your Results Global Average
Questions 5 5
Correct 0 3.37
Score 0% 67%

Review

1

Which of the following is not an advantage that disc brakes have over drum brakes?

50% Answer Correctly

are more easily cooled

use less brake fluid

provide a larger contact area

provide more braking force


Solution

Brakes utlize friction to slow vehicle tires. Drum brakes employ a cast iron drum that roates with the vehicle axle. When hydraulic pressure is applied to the brake assemblies at the wheels, internal pistons expand and push brake shoes outward into contact with the brake drum slowing the rotation of the axle. More powerful disc brakes operate by pinching a rotating disc betweeen two brake pads and allow for a larger surface area to contact the disc, provide more force, and are more easily cooled.


2

Ignition timing is measured in number of degrees:

59% Answer Correctly

after bottom dead center

after top dead center

before top dead center

before bottom dead center


Solution

Ignition timing defines the point in time at the end of the compression stroke that the spark plug fires. Measured in number of degrees before top dead center (BTDC), the exact point that the spark plugs initiate combustion varies depending on the speed of the engine. The timing is advanced (the spark plugs fire a few more degrees BTDC) when the engine is running faster and retarded when it's running slower.


3

The right front wheel of your front-wheel drive car drops into a pothole and the left front wheel doesn't lose contact with the road. Which of the following is true?

75% Answer Correctly

your car has a rigid axle rear suspension

your car has an independent front suspension

your car has a rigid axle front suspension

your car has an independent rear suspension


Solution

An independent suspension allows the wheels on either side of an axle to move independently from each other. The fact that the left front wheel didn't move up in response to the right front wheel moving down is evidence of this.


4

Modern car engines are cooled by:

81% Answer Correctly

ice

air conditioner

air

liquid


Solution

Modern car engines are cooled by liquid which circulates through the engine block and cylinder heads absorbing excess heat. This liquid is made up of half water and half antifreeze (commonly, ethylene glycol) which both keeps the water from freezing at low temperatures and raises its boiling point making heat transfer more efficient.


5

The distributor is responsible for:

71% Answer Correctly

distributing power to the correct drive wheels

recharging the battery

timing the spark and distributing it to the correct cylinder

utlizing battery power to start the engine


Solution

The distributor is driven by the engine's camshaft and is responsible for timing the spark and distributing it to the correct cylinder. The distributor cap contains a rotor that connects the ignition coil (and its high voltage) to the proper cylinder at the proper point in the stroke cycle.