Question 1

When the cranking circuit is energized in sub-zero conditions,the engine turns over slowly and unevenly.Which of the following would be the most likely cause?
A) defective starter relay
B) defective starter solenoid
C) gelled engine oil
D) stripped flywheel ring gear

Accepted Answer

Gelled engine oil is the most likely cause because in sub-zero conditions, oil can thicken and gel, which increases resistance against the moving parts of the engine, causing it to turn over slowly and unevenly.

Question 2

Technician A says that a neutral safety switch is designed to open circuit when a transmission is in Park range.Technician B says that a neutral safety switch is designed to close when the transmission is in neutral.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Technician A says that a neutral safety...

Question 3

Technician A says that when placing an inductive pick-up clamp onto a starter cable,the arrow must point to the correct direction of conventional current flow.Technician B says that high current flow can be produced by an open in the starter motor field windings.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician A is correct because the inductive pick-up clamp, used for measuring current flow in a circuit, must be oriented correctly to accurately detect the direction of conventional current flow (from positive to negative). Technician B is incorrect because an open in the starter motor field windings would prevent current flow, not produce high current flow.

Question 4

When used,where is a starter safety switch likely to be located?
A) standard transmission
B) automatic transmission
C) either a standard or automatic transmission
D) ignition key

Accepted Answer

A starter safety switch can be found in both standard (manual) and automatic transmissions. Its purpose is to prevent the engine from starting unless the transmission is in a safe starting position (neutral for manual transmissions, park or neutral for automatics).

Question 5

Technician A says that the starter motor used to crank diesel engines can draw up to 400 amps of current.Technician B says that high resistance on the insulated side of a starter motor circuit would cause higher than specified starter motor current draw.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Diesel engines require more power to crank, and the starter motor can indeed draw up to 400 amps. Technician B is incorrect because high resistance in the circuit would actually cause lower current draw, not higher.

Question 6

What percentage of starter motors returned under warranty are tested to perform to specification by the OEM?
A) 100%
B) 80%
C) 50%
D) 30%

Accepted Answer

The answer of What percentage of starter motors returned under...

Question 7

When a cranking circuit is energized,a series of rapid clicks is heard with a no-crank condition.Technician A says that this could be caused by discharged batteries.Technician B says this could be caused by corrosion on the starter insulated terminal.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. Discharged batteries can lead to insufficient power being supplied to the starter, causing it to click without turning the engine. Similarly, corrosion on the starter's insulated terminal can impede electrical flow, also resulting in a clicking sound without the engine cranking.

Question 8

When using a carbon pile to load test a battery,which of the following should occur as you turn the control knob clockwise?
A) resistance reading increases
B) current reading increases
C) voltage reading increases
D) voltage and current readings increase

Accepted Answer

Turning the control knob clockwise on a carbon pile load tester decreases the resistance, which allows more current to flow through the circuit, thus increasing the current reading.

Question 9

What should be used to clean a dirty commutator in a disassembled starter motor?
A) general purpose emery cloth
B) right-angle grinder
C) sandpaper with #100 grit or less
D) sandpaper with #400 grit

Accepted Answer

The answer of What should be used to clean a...

Question 10

Which of the following connects the cranking control circuit with the starter motor high current circuit?
A) ignition switch
B) starter button
C) starter relay
D) starter solenoid

Accepted Answer

The starter solenoid connects the cranking control circuit with the starter motor high current circuit by acting as a switch that closes the high current circuit when activated.

Question 11

If a heavy duty starter motor appears to spin when energized but the engine does not turn,which of the following could be at fault?
A) worn pinion gear
B) stripped flywheel ring gear
C) defective starter drive assembly
D) all of the above

Accepted Answer

All of the options listed (worn pinion gear, stripped flywheel ring gear, and defective starter drive assembly) could cause a situation where the starter motor spins but fails to engage the engine, preventing it from turning over.

Question 12

If you are bypassing a starter relay switch using a jumper wire,what component is being tested?
A) starter solenoid
B) ignition key
C) battery bank
D) starter relay/ mag switch

Accepted Answer

The answer of If you are bypassing a starter relay...

Quiz 9: Cranking Systems

When the cranking circuit is energized in sub-zero conditions,the engine turns over slowly and unevenly.Which of the following would be the most likely cause?

Technician A says that a neutral safety switch is designed to open circuit when a transmission is in Park range.Technician B says that a neutral safety switch is designed to close when the transmission is in neutral.Who is correct?

Technician A says that when placing an inductive pick-up clamp onto a starter cable,the arrow must point to the correct direction of conventional current flow.Technician B says that high current flow can be produced by an open in the starter motor field windings.Who is correct?

When used,where is a starter safety switch likely to be located?

Technician A says that the starter motor used to crank diesel engines can draw up to 400 amps of current.Technician B says that high resistance on the insulated side of a starter motor circuit would cause higher than specified starter motor current draw.Who is correct?

What percentage of starter motors returned under warranty are tested to perform to specification by the OEM?

When a cranking circuit is energized,a series of rapid clicks is heard with a no-crank condition.Technician A says that this could be caused by discharged batteries.Technician B says this could be caused by corrosion on the starter insulated terminal.Who is correct?

When using a carbon pile to load test a battery,which of the following should occur as you turn the control knob clockwise?

What should be used to clean a dirty commutator in a disassembled starter motor?

Which of the following connects the cranking control circuit with the starter motor high current circuit?

If a heavy duty starter motor appears to spin when energized but the engine does not turn,which of the following could be at fault?

If you are bypassing a starter relay switch using a jumper wire,what component is being tested?