ASVAB ASVAB Certifications ASVAB-SECTION-4 Questions & Answers

• Question 121:

  When all other lights show normal illumination but one headlight is dim, it is a good sign that the __________.

  A. battery is weak.

  B. headlight switch is defective.

  C. headlight unit needs adjustment.

  D. headlight has a poor ground connection.

  Correct Answer: D

  A loose or corroded headlight ground connection will cause a dim light. If the headlight switch is faulty, all lights will be affected, not just the headlight.

• Question 122:

  The brushes in an alternator ride on __________.

  A. the commutator

  B. the stator

  C. slip rings

  D. the heat sink

  Correct Answer: C

  Two slip rings are mounted on the rotor shaft. Two brushes ride on the slip rings and deliver electrical energy to the rotor windings.

• Question 123:

  Battery electrolyte is a mixture of distilled water and __________.

  A. baking soda

  B. sulfuric acid

  C. lead peroxide

  D. carbon particles

  Correct Answer: B

  Battery electrolyte is a mixture of approximately 60% distilled water and 40% sulfuric acid.

• Question 124:

  The terminals exposed on the ignition induction coil are __________.

  A. two secondary and one primary

  B. one secondary and one primary

  C. one secondary and two primary

  D. two secondary and two primary

  Correct Answer: C

  On a conventional ignition coil, the center tower is the secondary or high-voltage terminal. The two small studs at the top of the coil are primary or low-voltage terminals.

• Question 125:

  The order in which an engine's spark plugs fire is established by the order in which the __________.

  A. plugs are mounted in the engine.

  B. plug leads are connected to the distributor cap.

  C. condenser is connected.

  D. contact points are opened.

  Correct Answer: B

  Spark plug leads must be installed in the correct tower of the cap to ensure the proper firing order. The firing order is the order that the spark plugs ignite the air/fuel mixture in the combustion chamber. A typical firing order for a six-cylinder engine is 1-5-3-6-2-4.

• Question 126:

  The purpose of the drive shaft is to connect the __________.

  A. piston to the transmission

  B. differential to the transmission

  C. flywheel to the crankshaft

  D. camshaft to the crankshaft

  Correct Answer: B

  On a rear-wheel-drive vehicle, the driveshaft transmits power from the transmission to the differential. The flywheel is bolted directly to the crankshaft.

• Question 127:

  The general procedure to follow when adjusting a band on an automatic transmission is to __________.

  A. loosen, tighten to a specified torque, loosen a specified number of turns, and lock.

  B. tighten to a specified torque with a torque wrench and lock.

  C. tighten to a specified torque, loosen five turns, and lock.

  D. loosen, tighten to a specified torque, and lock.

  Correct Answer: A

  To properly adjust an automatic transmission band, loosen the adjusting screw locknut.

  Then tighten the adjusting screw to the specified torque with a torque wrench.

  Next, loosen the adjusting screw the specified number of turns.

  Complete the job by holding the adjusting screw and tightening the locknut.

• Question 128:

  A clutch release bearing __________.

  A. rotates whenever the engine is turning.

  B. rotates when only the clutch is engaged.

  C. rotates whenever the clutch pedal is depressed.

  D. holds the clutch shaft in alignment.

  Correct Answer: C

  When a clutch pedal is depressed, the release bearing comes in contact with the fingers of the clutch pressure plate and rotates.

• Question 129:

  In a three-speed transmission, the cluster gear is supported by the __________.

  A. pinion shaft

  B. countershaft

  C. main shaft

  D. output shaft

  Correct Answer: B

  The countershaft is pressed into the transmission case and supports the cluster gear. The main shaft or output shaft is splined with the driveshaft.

• Question 130:

  A car with worn-out shock absorbers __________.

  A. cannot carry a heavy load.

  B. will bounce a lot on a rough road.

  C. sags very low to the ground.

  D. will have no traction on a wet road.

  Correct Answer: B

  Shock absorbers control spring oscillation. Original equipment shocks that do not use air or spring assists are not designed to control vehicle height.