ASVAB Automotive Information Practice Test 634209 Results

Your Results Global Average
Questions 5 5
Correct 0 2.82
Score 0% 56%

Review

1

Another name for a reciprocating engine is a(n):

41% Answer Correctly

piston engine

cylinder engine

internal combustion engine

external combustion engine
Solution

A reciprocating engine is an engine whose crankshaft is turned by pistons moving up and down in a cylinder.

2

Just before the piston reaches top dead center, the spark plug fires and ignites the compressed air-fuel mixture. This describes which engine stroke?

61% Answer Correctly

exhaust

power

compression

intake
Solution

During the power stroke, just before the piston reaches top dead center, the spark plug fires and ignites the compressed air-fuel mixture. The resulting expansion due to combustion pushes the piston back down the cylinder toward bottom dead center.

3

The spark plugs fire a few extra degrees before top dead center when the engine is running faster. In this case the engine's timing is:

62% Answer Correctly

synchronous

advanced

retarded

asynchronous
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.

4

Which of the following is not a component in the engine lubrication system?

70% Answer Correctly

pressure relief valve

differential

oil filter

pickup tube
Solution

In engine lubrication, oil remains in the oil pan until the engine is turned on. It then gets sucked up the pickup tube by the oil pump and pressurized. This pressure is moderated by the pressure relief valve and the oil is fed through the oil filter into the engine to lubricate it.

5

For inline cylinder arrangements in an engine, how are the cylinders numbered?

50% Answer Correctly

alternating from the front of the engine to the back

sequentially from the front of the engine to the back

alternating from the back of the engine to the front

sequentially from the back of the engine to the front
Solution

Inline cylinder arrangements number cylinders sequentially (1, 2, 3, ...) front to rear.