Cranking quiz

Question 1

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

Answer 1

20:1

Question 2

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

45 seconds

15 seconds

1 minute

30 seconds

Answer 2

30 seconds

Question 3

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.

Answer 3

current flow through the field coil.

Question 4

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.

Answer 4

toward the weaker side of the magnetic field.

Question 5

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.

Answer 5

counter electromotive force.

Question 6

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

12.6

9.4

450

10.8

Answer 6

10.8

Question 7

The type of winding shown in the diagram below is:

compound wound.

series-parallel wound.

parallel wound.

series wound.

Answer 7

compound wound.

Question 8

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.

Answer 8

limit RPM.

Question 9

The clutch shown below is a:

posi-torque

inertia drive.

fluid clutch

overrunning clutch.

Answer 9

overrunning clutch.

Question 10

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.

Answer 10

control current to the pull in and hold in windings.

Question 11

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

Answer 11

meshing spring

Question 12

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

series

series parallel

parallel

compound

Answer 12

series

Question 13

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

Answer 13

opened

Question 14

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

Answer 14

pull in

Question 15

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

isolated ground.

does not require a ground.

internal ground

shorted coil.

Answer 15

isolated ground.

Question 16

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.

Answer 16

poor brush to commutator contact.

Question 17

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.

Answer 17

shorted field coil.

Question 18

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.

Answer 18

the insulated brush holder is grounded.

Question 19

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.

Answer 19

check battery state of charge and recharge if necessary.

Question 20

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

Answer 20

The armature is grounded

Question 21

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

Answer 21

shorted.

Question 22

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

Answer 22

1.0v

Question 23

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.

Answer 23

pull in winding for shorts.

Question 24

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

Answer 24

open in the pull in winding

Question 25

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

Answer 25

higher than normal starter current draw

Question 26

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

Answer 26

battery has a surface charge

Question 27

Ampere turns would indicate a coils: voltage resistance electromagnetic strength north and south polarity

Answer 27

electromagnetic strength

Question 28

OCV is tested with: ammeter carbon pile ohm meter volt meter

Answer 28

volt meter

Question 29

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

Answer 29

six pole, six coil series wound field

Question 30

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

Answer 30

compound wound field

Question 31

Most starter motors have ___________________ brushes as poles. the same number twice as many none of the supplied answers is correct one-half as many

Answer 31

the same number

Question 32

Solenoid dis-engagement is accomplished by spring action and: battery current flywheel motion magnetic field cancellation the build-up of a magnetic field

Answer 32

magnetic field cancellation

Question 33

The function of a brake washer is to _____________________. reduce wear increase voltage increase amperage increase resistance

Answer 33

reduce wear

Question 34

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

Answer 34

an open hold in winding

Question 35

Thrown solder inside a starter frame would indicate: a poor soldering job a shorted armature excessive cranking periods a shorted field

Answer 35

excessive cranking periods

Question 36

Burned commutator bars on an armature would indicate: a shorted armature coil an open field coil low starter resistance an open armature coil

Answer 36

an open armature coil

Question 37

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

Answer 37

shorted armature windings

Question 38

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

Answer 38

battery problems

Question 39

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

Answer 39

parallel while cranking

Question 40

A dirty commutator should be cleaned with: 80 grit sandpaper a rag and varsol 150 grit emery cloth 200 grit sandpaper

Answer 40

200 grit sandpaper

Question 41

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

Answer 41

a bent armature shaft

Question 42

A magnetic switch is another name for a relay True False

Answer 42

True

Question 43

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

Answer 43

True

Question 44

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

Answer 44

False

Question 45

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

Answer 45

True

Question 46

An engine ECM may prevent the cranking motor from cranking True False

Answer 46

True

Question 47

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

Answer 47

True

Question 48

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

Answer 48

False

Question 49

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

Answer 49

False

Question 50

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

Answer 50

False

Question 51

Cranking motor magnetic switches may be 3 or 4 terminals True False

Answer 51

True

Question 52

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

Answer 52

True