EETC - Equipment & Engine Training Council Electrical Systems Diagnostics Questions and Answers

Question 1

A technician is diagnosing a parasitic draw on a piece of equipment.
With the ignition off and all accessories turned off, the multimeter, connected in series with the negative battery cable, reads 250 mA.
What is the most appropriate next step?

Accepted Answer

Begin pulling fuses one by one while observing the multimeter reading.

Answer

Replace the battery, as it is likely failing to hold a charge.

Answer

Start the engine to check if the charging system can overcome the draw.

Answer

Perform a voltage drop test across the main power and ground cables.

Question 2

When testing the AC voltage output from a stator on a small engine, where should the multimeter leads be placed?

Accepted Answer

Across the two stator output wires (or pins) coming from under the flywheel housing.

Answer

One lead on the stator output wire and the other lead on the engine block (ground).

Answer

One lead on the positive battery terminal and the other lead on the stator output wire.

Answer

One lead on the voltage regulator output and the other lead on the negative battery terminal.

Question 3

A technician performs a voltage drop test on the starter motor's positive cable. With the engine cranking, the multimeter reads 0.8 volts. What does this reading indicate?

Accepted Answer

There is high resistance in the positive side of the starter circuit.

Answer

The starter motor has excessive internal resistance and should be replaced.

Answer

The battery is fully charged and providing adequate voltage.

Answer

The ground connection between the engine and the battery is faulty.

Question 4

While testing an electronic ignition coil with a multimeter set to ohms, a technician measures the resistance of the secondary winding. What would a reading of 'OL' or infinity most likely indicate?

Accepted Answer

There is an open circuit or break within the secondary winding.

Answer

The primary winding is shorted to ground.

Answer

The coil is functioning correctly within specifications.

Answer

The secondary winding has an internal short circuit.

Question 5

Which of the following components in a small engine's charging system is specifically designed to act as a voltage regulator by allowing current to flow in reverse once a specific voltage is reached?

Accepted Answer

Zener Diode

Answer

Rectifier Diode

Answer

Capacitor

Answer

Stator

Question 6

A customer's zero-turn mower clicks once when the key is turned to the start position, but the engine does not crank. The battery is fully charged and the connections are clean and tight. Which of the following is the MOST likely cause?

Accepted Answer

A faulty starter solenoid.

Answer

A seized engine.

Answer

An open in the primary ignition coil winding.

Answer

A clogged fuel filter.