ASVAB Auto and Shop Information Practice Test 3: Diagnosing Problems and Shop Techniques
- Diagnosing Vehicle Problems and Shop Techniques
- 10 questions
- 15 minutes
Half of these questions ask what a symptom tells a mechanic; the other half cover shop techniques. Think about what each part or tool actually touches or moves.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
When a driver presses the brake pedal, it feels soft and spongy and sinks farther than normal. What is the most likely cause?
Correct answer: C
Air compresses while brake fluid does not, so air in the lines makes the pedal feel soft. Tires, the battery and the air filter are not part of the hydraulic brake system.
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Question 2
Thick black smoke comes from the exhaust of a gasoline engine. What does this usually mean?
Correct answer: A
Black smoke means a rich mixture: more fuel than the air can burn completely. Burning oil gives blue-gray smoke, and a lean mixture has too little fuel, not too much.
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Question 3
What is the main job of engine oil?
Correct answer: D
Oil forms a film between parts such as pistons, bearings and the crankshaft so they do not grind against each other. It also carries away some heat, but it has nothing to do with intake air or exhaust.
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Question 4
In a modern gasoline engine, which part sprays a measured amount of fuel into the intake air or the cylinder?
Correct answer: B
The injector opens for a precise moment to spray fuel as a fine mist. The fuel pump only moves fuel from the tank, and the filter only cleans it.
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Question 5
A tire is worn much more in the center of the tread than on both edges. What is the most likely cause?
Correct answer: C
Too much air makes the center of the tread bulge and carry most of the load. Underinflation does the opposite and wears both edges.
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Question 6
A carpenter saws a long board along the direction of its grain to make it narrower. What is this cut called?
Correct answer: A
Rip cuts run with the grain, while crosscuts go across it. A miter cut is an angled cut, such as for the corner of a picture frame.
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Question 7
A mechanic needs to cut off the head of a rusted rivet. Which tool, struck with a hammer, is made for this job?
Correct answer: D
A cold chisel is hardened steel made to cut metal without heating it. A wood chisel would be dulled or chipped, and a nail set only drives nail heads below a surface.
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Question 8
A woodworker wants a flat-head screw to sit flush with the surface of a board. Which bit should be used to prepare the hole?
Correct answer: B
A countersink bit cuts a cone-shaped recess that matches the angled underside of a flat-head screw. A spade bit makes a flat-bottomed hole, which does not fit the screw head.
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Question 9
Before drilling a hole in a steel plate, a machinist strikes a center punch at the marked spot. Why?
Correct answer: C
The dent gives the drill tip a starting point, so it does not slide across the smooth surface. A punch does not harden metal or measure it.
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Question 10
A worker must join two steel plates permanently with a strong, solid joint by melting the metal of both pieces together. Which process should be used?
Correct answer: D
Welding melts the base metals so they fuse into one piece. Soldering melts only a filler metal at a lower temperature and does not melt the plates, so it is much weaker on steel.
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