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Charging System and Cranking systems > Cranking quiz > Flashcards

Cranking quiz Flashcards

1
Q

When the starter motor is operating at 5000rpm, and the crankshaft is turning at 250 RPM, what is the gear ratio between the pinion and the ring gear?

15:1

20:1

1:1

25:1

A

20:1

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2
Q

To prevent overheating the starter motor, maximum cranking time should be limited to:

45 seconds

15 seconds

1 minute

30 seconds

A

30 seconds

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3
Q

The stationary magnetic field in a starter motor is created by:

current flow through the starter housing.

current flow through the armature.

current flow through the commutator.

current flow through the field coil.

A

current flow through the field coil.

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4
Q

A conductor carrying a current when placed within a stationary magnetic field will try to move:

toward the weaker side of the magnetic field.

toward the north pole.

toward the stronger side of the magnetic field.

toward the center of the magnetic field.

A

toward the weaker side of the magnetic field.

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5
Q

The electrical voltage which is built up by the turning armature windings, and acts to limit the motors maximum rotational speed is called:

counter rotational force.

counter electromotive force.

counter magnetic force.

electromotive force.

A

counter electromotive force.

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6
Q

A cranking motor which draws 450 amps at 24 volts will produce ____________ kilowatts of power.

12.6

9.4

450

10.8

A

10.8

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7
Q

The type of winding shown in the diagram below is:

compound wound.

series-parallel wound.

parallel wound.

series wound.

A

compound wound.

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8
Q

The main function of the shunt in the winding shown in question 7 is to produce a voltage which will:

increase RPM.

Increase torque.

decrease torque.

limit RPM.

A

limit RPM.

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9
Q

The clutch shown below is a:

posi-torque

inertia drive.

fluid clutch

overrunning clutch.

A

overrunning clutch.

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10
Q

The function of the magnetic switch in the diagram shown is to:

control current to the pull in and hold in windings.

isolate the ground when the ignition is off.

control current to the starter motor.

supply a ground to the ignition circuit.

A

control current to the pull in and hold in windings.

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11
Q

The part of the starter drive which ensures the drive pinion and the flywheel mesh is the:

collar and shell assembly

sprag clutch

inner race

meshing spring

A

meshing spring

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12
Q

Safety switches are wired in ___________ in the starter control circuit.

series

series parallel

parallel

compound

A

series

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13
Q

The contacts in the over crank protection switch are _______________ when the starter temperature increases to an unacceptable level.

open all the time

closed

not used under the described circumstances

opened

A

opened

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14
Q

To release the starter solenoid quickly, the current draw in the ______________ winding reverses direction to cancel out the magnetic fields and allow the return spring to disengage the starter with greater speed.

hold in

pull in

field coil

armature

A

pull in

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15
Q

The diagram shown below illustrates a cranking circuit magnetic switch with an:

isolated ground.

does not require a ground.

internal ground

shorted coil.

A

isolated ground.

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16
Q

Which of the following conditions would result in a low current draw, low free speed condition of the starter motor?

open field coil.

poor brush to commutator contact.

tight bushings.

grounded field coil.

A

poor brush to commutator contact.

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17
Q

Which of the following conditions would cause a high current draw and higher than normal starter free speed?

open armature coil

high resistance in the solenoid contact terminals.

grounded field coil

shorted field coil.

A

shorted field coil.

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18
Q

A self powered test light, lights when connected to the starter case and the insulated brush. What problem is indicated?

the grounded brush holder is OK.

the insulated brush holder is OK.

the grounded brush holder is open.

the insulated brush holder is grounded.

A

the insulated brush holder is grounded.

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19
Q

An engine has a normal starter draw of 550 amps at 22.4 volts. When tested the draw was found to be 185 amps at 19.4 volts. What should be done next?

perform a battery capacity test.

perform a voltage drop test.

replace the starter because of a short.

check battery state of charge and recharge if necessary.

A

check battery state of charge and recharge if necessary.

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20
Q

When testing a starter armature with a self powered test light, the light comes on when one lead is on a commutator bar and the other lead is on the armature shaft. What does this indicate?

The armature is normal

The armature is open

The armature is grounded

The armature is shorted

A

The armature is grounded

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21
Q

If the metal strip shown in the diagram below vibrates, the armature is:

Testing a Model T Generator Armature Using a Growler – Model T Ford Fix

shorted.

normal

grounded

open

A

shorted.

22
Q

What is the maximum allowable voltage drop in the starter insulated and ground side COMBINED, on a 24 volt system with 2 separate battery groups?

2.0v

1.0v

1.5v

0.5v

A

1.0v

23
Q

The diagram shown below illustrates the procedure for testing the:

solenoid contact points for resistance.

hold in winding for ground faults

pull in winding for shorts.

pull in winding for ground faults.

A

pull in winding for shorts.

24
Q

Which of the following conditions would NOT cause solenoid chattering?

high resistance in the isolated circuit

open in the hold in winding

low battery voltage (20v)

open in the pull in winding

A

open in the pull in winding

25
Q

A seized engine would cause:

no starter current draw

normal starter current draw

lower than normal starter current draw

higher than normal starter current draw

A

higher than normal starter current draw

26
Q

An OCV reading of 28.2 volts on a battery group would indicate:

battery cables are corroded causing high resistance

battery has a surface charge

battery requires a load test

one or more battery cells are open

A

battery has a surface charge

27
Q

Ampere turns would indicate a coils:

voltage

resistance

electromagnetic strength

north and south polarity

A

electromagnetic strength

28
Q

OCV is tested with:

ammeter

carbon pile

ohm meter

volt meter

A

volt meter

29
Q

Which of the following starter motor field coil windings, provides the greatest starting torque?

four pole, four coil series wound field

six pole, six coil series wound field

compound wound field

six pole, six coil parallel wound field

A

six pole, six coil series wound field

30
Q

Which of the following starter motors has a built in provision to prevent excessively high free running speed?

compound wound field

six pole, six coil parallel wound field

six pole, six coil series wound field

four pole, four coil series wound field

A

compound wound field

31
Q

Most starter motors have ___________________ brushes as poles.

the same number

twice as many

none of the supplied answers is correct

one-half as many

A

the same number

32
Q

Solenoid dis-engagement is accomplished by spring action and:

battery current

flywheel motion

magnetic field cancellation

the build-up of a magnetic field

A

magnetic field cancellation

33
Q

The function of a brake washer is to _____________________.

reduce wear

increase voltage

increase amperage

increase resistance

A

reduce wear

34
Q

A condition, other than low battery, that would cause an oscillating (chattering) solenoid would be:

an open pull in winding

an open hold in winding

a dirty contact disc

a shorted pull in winding

A

an open hold in winding

35
Q

Thrown solder inside a starter frame would indicate:

a poor soldering job

a shorted armature

excessive cranking periods

a shorted field

A

excessive cranking periods

36
Q

Burned commutator bars on an armature would indicate:

a shorted armature coil

an open field coil

low starter resistance

an open armature coil

A

an open armature coil

37
Q

During a no load starter test, a low speed with a high current draw would indicate:

shorted armature windings

shorted field windings

open armature windings

dirty brushes and commutators

A

shorted armature windings

38
Q

When performing the “starter draw test”, battery voltage dropped below 8.5 volts and the amperage draw was within the acceptable range. This would indicate:

starter switch problems

starter problems

battery problems

a normal condition

A

battery problems

39
Q

To perform a voltage drop test, the voltmeter is connected to the portion of the circuit to be tested in:

parallel while cranking

series-parallel while cranking

series while cranking

parallel with the engine off

A

parallel while cranking

40
Q

A dirty commutator should be cleaned with:

80 grit sandpaper

a rag and varsol

150 grit emery cloth

200 grit sandpaper

A

200 grit sandpaper

41
Q

During a no-load starter test, a low speed with a high current draw would indicate:

dirty brushes and commutator

open armature windings

a bent armature shaft

shorted field windings

A

a bent armature shaft

42
Q

A magnetic switch is another name for a relay

True
False
A

True

43
Q

A magnetic switch allows the control of a large current with the application of a small current.

True
False
A

True

44
Q

A neutral safety switch will prevent the starter from cranking unless the clutch pedal is depressed.

True
False
A

False

45
Q

Safety switches must always be connected in series with the magnetic switch control circuit.

True
False
A

True

46
Q

An engine ECM may prevent the cranking motor from cranking

True
False
A

True

47
Q

The over crank protection switch in the following figure, prevents the starter from overheating by opening the field coil winding when hot and preventing cranking until the starter cools
True
False

A

True

48
Q

A cranking motor solenoid switch has two sequential functions. First to connect the power to the motor, and second to shift the drive assembly into mesh with the engine ring gear.

True
False
A

False

49
Q

The hold in winding and the pull in winding are connected at the motor terminal.

True
False
A

False

50
Q

Current is flowing through the pull in winding any time that the S terminal has power to it.

True
False
A

False

51
Q

Cranking motor magnetic switches may be 3 or 4 terminals

True
False
A

True

52
Q

The cranking motor magnetic switch may have a safety switch on the control circuit ground.

True
False
A

True

Charging System and Cranking systems (4 decks)

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