ASVAB Automotive Information Practice Test 522412 Results

Your Results Global Average
Questions 5 5
Correct 0 3.51
Score 0% 70%

Review

1

Which of the following is the result of the air-fuel mixture exploding instead of burning?

64% Answer Correctly

pre-detonation

pre-ignition

post-ignition

detonation


Solution

Normal combustion in an engine is initiated by a spark plug and results in the complete burning of the air-fuel mixture. If combustion is initiated by a source other than the spark plug, by a hot spot in the cylinder or combustion chamber for example, pre-ignition results. Detonation results if the air-fuel mixture explodes instead of burning. Detonation can cause extremes in pressure in the combustion chamber leading to engine damage.


2

A constant velocity (CV) joint is closely related to which of the following?

63% Answer Correctly

sprint joint

master cylinder

universal joint

ball joint


Solution

Like CV joints, universal joints (U-joints) are located at each end of a drive shaft and allow the shaft to operate at a variable angle with the item it is driving. Universal joints perform the same basic function as CV joints but CV joints have a wider range of operation.


3

The fuel injectors are fed fuel by the:

65% Answer Correctly

electric fuel pump

fuel pressure regulator

powertrain control module

fuel return line


Solution

The electric fuel pump feeds pressurized fuel through a fuel filter to the fuel injectors via the fuel rail manifold. The fuel rail contains the fuel pressure regulator which ensures that the fuel injectors receive fuel at a consistent and known rate. Excess fuel bled off by the pressure regulator returns to the fuel tank through the fuel return line.


4

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 front suspension

your car has an independent rear suspension

your car has an independent front suspension

your car has a rigid axle 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.


5

When a car engine is running, what provides electrical current to recharge the battery and power the electrical system?

84% Answer Correctly

battery

alternator

camshaft

solenoid


Solution

Once the engine is running, the alternator provides electrical current to recharge the battery and power the electrical system. The alternator is driven by the engine's crankshaft and produces alternating current (AC) which is then fed through a rectifier bridge to convert it to the direct current (DC) required by the electrical system. A voltage regulator controls the output of the alternator to maintain a consistent voltage (approx. 14.5 volts) in the electrical system regardless of load.