7.8 Exercises for Unit 7

1. In a lead-acid battery, current is produced by what type of reaction?

A. Photochemical
B. Chemical
C. Electrochemical
D. Electronic

2. A 12-volt lead-acid automotive battery consists of how many elements connected in series?

A. Six
B. Four
C. Three
D. Two

3. Why are the cell elements of a storage battery elevated inside the case?

A. To allow the electrolyte to circulate under the elements.
B. To prevent the elements from shorting against the case.
C. To reduce the amount of lead required for connecting the elements and terminal posts.
D. To prevent shorting of the elements when material from the plates settles to the bottom of the case.

4. When the temperature is 80°F, a fully charged lead-acid battery will produce what specific gravity reading?

A. 1.28
B. 1.82
C. 2.18
D. 2.81

5. When taking a hydrometer reading of a battery whose temperature is 100°F, you must make what modification to the reading to determine the actual specific gravity of the electrolyte?

A. Add 0.006
B. Add 0.008
C. Add 0.003
D. Add 0.004

6. What are the two methods for rating lead-acid storage batteries?

A. Reserve capacity and discharge
B. Reserve capacity and ampere-hour
C. Cold-cranking and reserve capacity
D. Cold-cranking and discharge

7. When charging batteries, you should take which action?

A. Add electrolyte to any cell in which the fluid level is below the top of the plates before charging.
B. Remove the vent plugs to prevent an accumulation of gases.
C. Take frequent hydrometer readings to determine if the battery is functioning properly during charging.
D. Remove each battery for a 10-minute break when half charged.

8. What procedure is considered the only safe way to mix electrolyte for a lead-acid battery?

A. Pour water into acid slowly and stir gently.
B. Pour water into acid slowly and stir vigorously.
C. Pour acid into water slowly and stir gently.
D. Pour acid into water slowly and stir vigorously.

9. When cleaning the top of a lead-acid battery, which combination should you use?

A. Soft bristle brush and a mixture of water and baking soda
B. Soft bristle brush and a mixture of water and muratic acid
C. Stiff bristle brush and a mixture of water and baking soda
D. Stiff bristle brush and a mixture of water and muratic acid

10. What test allows you to determine the general condition of a maintenance free battery?

A. Cell voltage
B. Battery leakage
C. Battery drain
D. Battery voltage

11. When load testing a battery with a cold-cranking rating of 350 amps, you should load the battery to what total number of amps?

A. 150
B. 175
C. 200
D. 225

12. The current generated by an alternator is converted to direct current by means of what component?

A. Armature coil
B. Condenser
C. Rectifier
D. Station field coil

13. What component of an alternator is mounted on the rotor shaft and provides current to the rotor windings?

A. Slip rings
B. Claw poles
C. Stator core
D. Coils

14. In what manner are stator windings connected in an alternator?

A. One end is connected to the positive diodes and the other end to the negative diodes.
B. One end is connected to the stator assembly and the other end to the rectifier assembly.
C. One end is connected to the negative diodes and the other end to the field windings.
D. One end is connected to the electrical terminals and the other end to the rotor shaft.

15. What type of stator will provide good current output at low engine speeds?

A. Delta-type
B. Omega-type
C. K-type
D. Y-type

16. A total of how many diodes are grounded in an alternator?

A. Four
B. Three
C. Two
D. One

17. Grounding the field terminal of the alternator will result in damage to the _____.

A. regulator
B. diodes
C. rotor windings
D. alternator

18. By what means can the proper operation of a charging system containing an alternator be checked?

A. Ammeter
B. Voltmeter
C. Screwdriver
D. Jumper wire

19. To determine if an alternator rotor is internally shorted, you can test the rotor windings with what device?

A. Armature growler
B. Galvanometer
C. Test lamp
D. Ohmmeter

20. When performing a regulator bypass test, which method should you use to bypass the voltage regulator?

A. Place a jumper wire from the field terminals of the alternator to the engine block.
B. Place a jumper wire from the test tab to the field terminals of the alternator.
C. Place a jumper wire across the battery and field terminals of the alternator.
D. Unplug the wire from the regulator.

21. What mechanism relies on the principle of inertial force to make the drive pinion mesh with the flywheel?

A. Bendix drive
B. Overruning clutch
C. Dyer drive
D. Reduction drive

22. In a starting circuit containing a solenoid, when is battery current supplied to the starter motor?

A. When the remote control switch is closed.
B. At the time the ignition switch is turned to the start position.
C. After the starter pinion is engaged with the flywheel.
D. When the plunger closes the contacts in the solenoid.

23. Field windings vary according to application. What is the most popular configuration used to provide a large amount of low-speed torque?

A. Six windings, series-parallel
B. Two windings, parallel
C. Three windings, series-parallel
D. Four windings, series

24. Which starting circuit component is common to all vehicles and equipment having automatic transmissions?

A. Starter solenoid
B. Relay
C. Neutral safety switch
D. Double reduction starter

25. When it is necessary to adjust a neutral safety switch, which test equipment is required?

A. Voltmeter
B. Ohmmeter
C. Inductive ammeter
D. Test light

26. The battery-ignition circuit consists of a total of how many circuits?

A. Four
B. Three
C. Two
D. One

27. In an ignition circuit, high voltage is directed to the spark plugs in the correct firing order by what component?

A. Ballast resistor
B. Ignition coil
C. Distributor rotor
D. Spark plug wires

28. When troubleshooting an ignition circuit, you should change the manufacturer's specified heat range of the spark plugs when what condition exists?

A. Increased resistance is required by the circuit.
B. Abnormal operating conditions are encountered.
C. Ignition timing is changed from the manufacturer’s setting.
D. High voltage surges in the primary circuit are reduced.

29. What component opens and closes the primary circuit of an electronic ignition system?

A. Electronic module control (EMC)
B. Electronic primary control (EPC)
C. Electronic circuit control (ECC)
D. Electronic control unit (ECU)

30. In a computerized timing advance mechanism, what sensor reports piston position to the computer?

A. Crankshaft
B. Camshaft
C. Throttle
D. Height

31. A grayish tan deposit on the insulator of a spark plug indicates what condition?

A. Normal operation
B. Carbon-fouled
C. Ash-fouled
D. Preignition damage

32. How often should spark plugs be regapped?

A. Each time the vehicle is serviced
B. At 6,000 mile intervals
C. Any time they are removed for inspection
D. During a "B" PM only

33. You have performed a spark plug wire resistance test. The test should not show the resistance to be over 5,000 ohms per inch, or what total number of ohms?

A. 25,000
B. 50,000
C. 100,000
D. 125,000

34. On a distributor cap, which condition will short coil voltage to ground?

A. Faulty distributor lead
B. Broken coil wire
C. Carbon trace
D. Broken rotor

35. After installing contact points, you notice that the faces do not make full contact. What corrective action should you take?

A. File the faces straight across the edge that is riding high.
B. Bend the movable breaker arm.
C. Bend the stationary contact bracket.
D. Remove the points and realign the faces.

36. (True or False) To advance timing, you should turn the distributor housing in the same direction as the shaft rotation.

A. True
B. False

37. Most automotive and construction equipment lighting systems operate on what voltages?

A. 6 or 12 volts
B. 12 or 18 volts
C. 12 or 24 volts
D. 18 or 24 volts

38. You are operating a vehicle with a 12-volt electrical system. The voltmeter in the vehicle should indicate a reading that falls within what voltage range?

A. 11.5 to 12.2
B. 13.2 to 14.5
C. 15.5 to 16.2
D. 17.5 to 18.3