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Alternators Flashcards

0
Q

When an ohmmeter is connected with one lead to a slip ring and the other to the rotor shaft, a reading of 3 ohms would indicate the rotor is:

a. Open
b. Shorted
c. Grounded
d. OK

A

c. Grounded

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1
Q

When an ohmmeter is connected with one lead to each of the slip rings and the resistance reading is below specs, the rotor is:

a. Shorted
b. Open
c. Grounded
d. OK

A

a. Shorted

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2
Q

With one ohmmeter lead connected to the stator lead and the other connected to the iron laminations, an infinite reading indicates that the stator is:

a. Open
b. Grounded
c. Shorted
d. OK

A

d. OK

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3
Q

By grounding the tab in the back of the Delco integral regulator alternator, we achieve maximum output by:

a. Grounding the sensing circuit
b. Grounding the field
c. Opening the field
d. Grounding the stator

A

b. Grounding the field

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4
Q

A Delta would stator can produce more current than a Y wound stator because the Delta windings are:

a. Longer
b. Heavier
c. In series
d. In parallel

A

d. In parallel

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5
Q

A serviceable diode is indicated by [blank] analog ohmmeter readings.

a. Two low
b. Two high
c. One high and one low
d. Two zero

A

c. One high and one low

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6
Q

In many alternators, the diodes are assembled in a component called a (an):

a. Rectifier bridge
b. Regulator bridge
c. Diode housing
d. Insulator block

A

a. Rectifier bridge

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7
Q

To bypass the voltage regulator in a “B” type charging system, the mechanic must:

a. Ground the field
b. Isolate the field relay
c. Supply 12 volts to the R terminal
d. Supply 12 volts to the F terminal

A

d. Supply 12 volts to the F terminal

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8
Q

In an “A” circuit charging system, the voltage regulator is located between the:

a. Ignition switch and the field coil
b. Battery and the field coil
c. The field coil and the sensing circuit
d. The field coil and ground

A

d. The field coil and ground

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9
Q

In an alternator, output regulation is achieved by varying:

a. Field current
b. Speed
c. Stator current
d. Magnetic polarity

A

a. Field current

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10
Q

Some transistorized voltage regulators incorporate a [blank] to vary voltage according to temperature.

a. Thyristor
b. Potentiometer
c. Capacitor
d. Thermistor

A

d. Thermistor

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11
Q

If a battery were connected with the positive terminal to the “P” material and the negative terminal to the “N” material, the diode is said to be:

a. Forward biased
b. Reverse biased
c. A zener diode
d. Open circuited

A

a. Forward biased

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12
Q

In order for current to flow through the emitter collector circuit of a PNP transistor, we must provide the base with:

a. A ground
b. “+” voltage
c. A specified resistance
d. All of the above

A

a. A ground

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13
Q

Circuit application of NPN transistors require the base to be connected to:

a. A ground
b. “+” voltage
c. A specified voltage
d. All of the above

A

b. “+” voltage

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14
Q

A “B” circuit alternator most often will have:

a. Two field terminals
b. Two insulated terminals
c. One internally grounded brush
d. An “R” terminal

A

c. One internally grounded brush

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15
Q

When an ammeter is placed in series with the slip rings and an attached 12 volt battery, we could measure:

a. Field draw
b. Voltage drop
c. Field pressure
d. Charging amperage

A

a. Field draw

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16
Q

The magnetic draw of an alternator is created in the:

a. Stator
b. Rectifier
c. Rotor
d. Bearings

A

c. Rotor

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17
Q

Alternator brushes must carry approximately [blank] amperes.

a. 1 to 2
b. 2 to 6
c. 10 to 36
d. 36 to 50

A

b. 2 to 6

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18
Q

When checking an alternator diode trio, if an ohmmeter reads low ohms in both direction on one leg, the diode is:

a. Okay - normal
b. Defective - shorted
c. Okay - open
d. Defective - open

A

b. Defective - shorted

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19
Q

Warning lamps are installed so that they will not light when:

a. The voltage on the battery side of the lamp is higher
b. Field current is flowing from the battery to the alternator
c. The voltage on both sides of the lamp is equal
d. None of the above

A

b. Field current is flowing from the battery to the alternator

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20
Q

The voltage regulator in an alternator charging system is a device that controls:

a. Maximum voltage output
b. Voltage output
c. Current output
d. Minimum voltage output

A

b. Voltage output

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21
Q

A probable cause of undercharging is:

a. A field wire is shorted
b. A sulphated battery
c. High resistance between the battery and fuse block
d. Low resistance in the alternator field circuit

A

b. A sulphated battery

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22
Q

The first step in inspecting the charging system is to:

a. Replace the alternator drive belt
b. Remove the alternator
c. Check the battery conditions
d. Check system voltage

A

c. Check the battery conditions

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23
Q

There should be battery voltage available at the alternator output terminal:

a. At all times
b. When the ignition is switched on
c. When the engine is running
d. If the regulator is defective

A

a. At all times

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24
Q

Manufacturers often recommend a voltage output test, rather than a current output test to prevent:

a. System overloading
b. Electronic component damage
c. Alternator damage
d. Wiring damage

A

b. Electronic component damage

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25
Q

Which of the following is NOT a typical alternator bench test?

a. Rotor continuity test
b. Stator ground test
c. Growler test
d. Diode test

A

c. Growler test

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26
Q

If a self powered test light does not light when connected to both slip rings of a rotor, the winding is:

a. Open
b. Good
c. Shorted
d. Grounded

A

a. Open

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27
Q

If an ohmmeter reading is low when connected between each pair of stator leads, the winding is:

a. Open
b. Good
c. Shorted
d. Grounded

A

c. Shorted

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28
Q

An alternator oscilloscope trace that shows a series of equally spaced and equal sized pulses indicates:

a. An open diode
b. A grounded diode
c. A good stator and diode
d. A weak capacitor

A

c. A good stator and diode

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29
Q

When checking diode resistance by reversing the leads of an ohmmeter, a good diode produces:

a. Two low readings
b. Two high readings
c. One high and one low reading
d. One high and one infinite reading

A

c. One high and one low reading

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30
Q

Alternator charging systems are generally regulated to produce a maximum output of:

a. 12.6 volts
b. 13.6 volts
c. 14.6 volts
d. 15.6 volts

A

c. 14.6 volts

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31
Q

The magnetic field of an alternator is carried in the:

a. Stator
b. Rotor
c. Housing
d. Slip ring

A

b. Rotor

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32
Q

The output of an alternator is created in the:

a. Stator
b. Rotor
c. Housing
d. Brushes

A

a. Stator

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33
Q

An alternator stator with three windings usually has:

a. 3 diodes
b. 6 diodes
c. 9 diodes
d. 12 diodes

A

b. 6 diodes

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34
Q

Tech A says a source of current for the alternator field is the battery.
Tech B says a source current for the alternator output?!?
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

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35
Q

Tech A says an alternator’s output voltage is directly related to field strength and rotor speed.
Tech B says an alternator’s induced voltage is directly related to rotor speed and or field strength.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

36
Q

The alternator self regulates its own:

a. Voltage
b. Current
c. Resistance
d. Temperature

A

b. Current

37
Q

Tech A says an alternator cannot start operation independently because there is not enough residual magnetism in the rotor poles to induce voltage when the engine first begins to run.
Tech B says an alternator cannot start operation independently if it does not have an excitation circuit.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

38
Q

A field relay may be used to:

a. Regulate rotor speed
b. Control the indicator lamp circuit
c. Shunt the voltage from the diode
d. Increase voltage when temperatures increase

A

b. Control the indicator lamp circuit

39
Q

Solid state regulators use all of the following except:

a. Diodes
b. Transistors
c. Zener diodes
d. Contacts

A

d. Contacts

40
Q

The solid state component that acts like a relay is a:

a. Transistor
b. Zener diode
c. Thermistor
d. Capacitor

A

a. Transistor

41
Q

The solid state component that allows more current flow as temperature increases is a:

a. Transistor
b. Zener diode
c. Thermistor
d. Capacitor

A

c. Thermistor

42
Q

A solid state component that acts as a one way electrical check valve is a:

a. Diode
b. Thermistor
c. Capacitor
d. Transistor

43
Q

Tech A says some vehicles use a warning lamp to alert the driver of a concern with the charging system.
Tech B says many vehicles are equipped with an ammeter or voltmeter to indicate charging system performance.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

44
Q

The indicator used to measure current flow into and out of the battery is the:

a. Voltmeter
b. Ammeter
c. Warning lamp
d. Field relay

A

b. Ammeter

45
Q

Tech A says loose or broken drive belts could be the cause of a no charge concern.
Tech B says a sulphated battery could case a no charge or undercharging concern.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

46
Q

Which of the following conditions is not serviceable?

a. Belt length stretch
b. Tight belt
c. Dusty belt
d. Glazed belt

A

d. Glazed belt

47
Q

Tech A says a poor regulator ground may cause an overcharging concern.
Tech B says an open in the wiring between the alternator and the battery could cause an overcharging concern.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

48
Q

Tech A says that the alternator output test must be performed before the voltage regulator test.
Tech B says a voltage drop test must be performed whether the alternator is overcharging or undercharging.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

c. Both A and B

49
Q

An alternator that makes a whining noise has a/an:

a. Shorted diode
b. Low output
c. Open stator
d. Open diode

A

a. Shorted diode

50
Q

To full field an “A” type circuit, you must:

a. Ground the field circuit to the regulator
b. Feed the field circuit to regulator
c. Feed the “R” terminal circuit at the regulator

A

a. Ground the field circuit to the regulator

51
Q 
An oscilloscope is being used to test an alternator. The trace line is smooth with three repeating identical ripples.
Tech A says one diode is open.
Tech B says all the alternator diodes are good.
Who is correct?
   a. A only
   b. B only
   c. Both A and B
   d. Neither A nor B
52
Q

On most electronic voltage regulators, the field current switches on and off at a [blank] frequency.

a. Variable
b. Oscillating
c. Fixed
d. Analog

53
Q

To full field a “B” type circuit, you must:

a. Ground the field circuit to regulator
b. Feed the field circuit to the alternator
c. Ground the “R” terminal circuit at the regulator
d. Feed the “R” terminal circuit at the regulator

A

b. Feed the field circuit to the alternator

54
Q

The first wire to disconnect when removing an alternator is the:

a. Battery ground cable
b. Battery positive cable
c. Alternator field
d. Alternator output

A

a. Battery ground cable

55
Q

A test lamp connected to each slip ring should:

a. Light, showing continuity
b. Not light, showing an open
c. Light, showing a ground
d. Blink on and off, indicating intermittent grounding

A

a. Light, showing continuity

56
Q

If a test lamp lead is connected to each of two stator leads, the lamp should:

a. Light, showing continuity
b. Light, showing a ground
c. Not light, showing an open
d. Blink on and off, indicating intermittent grounding

A

a. Light, showing continuity

57
Q

Which of the following is NOT an alternator bench test?

a. Rotor continuity
b. Stator continuity
c. Stator ground
d. Frame ground

A

d. Frame ground

58
Q

Which of the following is true of a diode and rectifier assembly test?

a. Diode is good if test lamp lights in both directions
b. Diode is good if test lamp does not light at all
c. Diode is good if test lamp lights in one direction but not the other
d. Diode is good if test lamp light blinks on and off

A

c. Diode is good if test lamp lights in one direction but not the other

59
Q

Alternators rectify AC using half-wave rectification.

a. True
b. False

60
Q

The magnetic field is carried by the stator.

a. True
b. False

61
Q

Field current for the alternator can come from the battery.

a. True
b. False

62
Q

The stator has three conductors.

a. True
b. False

63
Q

Brushes and slip rings carry the full alternator output.

a. True
b. False

64
Q

Most alternators use three positive and three negative diodes.

a. True
b. False

65
Q

Y and delta refers to types of stator windings.

a. True
b. False

66
Q

“A” and “B” type circuits are two stator winding types.

a. True
b. False

67
Q

An “A” circuit is an isolated field current.

a. True
b. False

68
Q

Alternator output voltage increases with rotor speed.

a. True
b. False

69
Q

Alternator output voltage decreases with field strength increase.

a. True
b. False

70
Q

A field relay may be used to open and close the alternator field circuit.

a. True
b. False

71
Q

A thermistor allows more current to flow as temperature increases.

a. True
b. False

72
Q

A charging system ammeter measures the battery state of charge.

a. True
b. False

73
Q

A warning lamp will warn the driver of an overcharged battery.

a. True
b. False

74
Q

Some late-model vehicles set fault codes should the charging system malfunction.

a. True
b. False

75
Q

The battery ground cable should be disconnected before removing any leads from the alternator.

a. True
b. False

76
Q

An alternator is polarized like a generator.

a. True
b. False

77
Q

The battery cables must be disconnected before charging a battery.

a. True
b. False

78
Q

An alternator can be operated without an external load.

a. True
b. False

79
Q

A low battery state of charge indicates a possible charging system problem.

a. True
b. False

80
Q

A warning lamp that flickers may be caused by worn brushes.

a. True
b. False

81
Q

A discharged battery may be caused by low alternator output.

a. True
b. False

82
Q

A warning lamp that stays on when the ignition switch is off may be caused by a shorted positive diode.

a. True
b. False

83
Q

An alternator field current draw test is performed with the engine on.

a. True
b. False

84
Q

Wires on an alternator cannot be mixed up so they need not be tagged.

a. True
b. False

85
Q

A diode has continuity in one direction.

a. True
b. False

86
Q

The slip rings should be grounded to the rotor shaft.

a. True
b. False

87
Q

One stator lead should have continuity with each of the others.

a. True
b. False

88
Q

Each of the stator leads should be grounded to the stator frame.

a. True
b. False

Interprovincial Review Questions (21 decks)

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