Free FESTO-L2-AIMC Practice Questions

Question 1

A 400 V star-delta starter must retain its star-start/delta-run sequence. A proposed replacement motor is rated 230 V delta / 400 V star and has all six winding ends accessible. Its frequency and shaft-power ratings are suitable. Which change resolves the voltage-and-connection mismatch?

Accepted Answer

Choose a six-lead motor rated 400 V delta / 690 V star.

Answer

Increase the star starting interval before transferring to delta.

Answer

Increase the contactors' current ratings while retaining the proposed motor.

Answer

Raise the overload setting to accommodate the proposed motor's delta current.

Question 2

A 24 V DC contactor needs at least 20 V across its coil to pick up. Its only coil path runs through an NC STOP, a reset NC overload, a held-closed START, and the coil to 0 V. Steady readings show 24.0 V at the supply, 17.0 V across the coil, and 6.8 V across the unpressed STOP contact and its terminations; other closed contacts each drop less than 0.1 V. Which fault accounts for the lost pickup voltage?

Accepted Answer

The STOP contact path has excessive series resistance.

Answer

The DC supply cannot maintain its output under load.

Answer

The contactor coil has a completely open winding.

Answer

The coil's return conductor has a complete break.

Question 3

Before replacing a 480 V starter coil, a qualified electrician isolates and locks out every identified source. The voltage tester responds correctly on a known live source, then indicates 0 V on all required work-point tests. Immediately afterward, it indicates 0 V on that same live source. A second verified instrument confirms that the source remains energized. What does the failed final check mean for the work-point readings?

Accepted Answer

They are unverified because the first tester may have failed during testing.

Answer

They remain valid because the tester was proved before the work-point tests.

Answer

They establish isolation if the original tester still passes a continuity check.

Answer

They are validated by the second instrument confirming that the proving source is live.

Question 4

A conveyor's squirrel-cage induction motor remains within its normal stable operating range. Supply voltage and frequency do not change. After more material is loaded, the shaft settles at a slightly lower speed and motor current increases. What accounts for this response?

Accepted Answer

The shaft slows relative to the field, increasing induced rotor current and torque.

Answer

The rotating field slows with the shaft, keeping rotor slip unchanged.

Answer

The added load reduces slip, allowing the rotor to develop more torque.

Answer

The rotor reaches synchronous speed before it can deliver the extra torque.

Question 5

Forward contactor F is held through its own NO auxiliary. The reverse pushbutton has only an NO contact and cannot interrupt F's holding circuit. Reverse coil R's only supply path includes an NC auxiliary operated by F. STOP and overload are closed, and the components are healthy. Predict the contactor states when the operator presses REVERSE.

Accepted Answer

F remains energized, and its open NC interlock prevents R from energizing.

Answer

F drops out, allowing R to energize after F releases.

Answer

Both coils energize, but the mechanical interlock prevents R from closing.

Answer

F drops out, and both contactors remain released until START is pressed again.

Question 6

An energy review compares a motor before and after upstream power-factor correction. Shaft output is unchanged, and a three-phase power analyzer measures 12.0 kW at the motor terminals in both tests. Current in the feeder supplying the motor and correction equipment has decreased. Which finding belongs in the energy-review report?

Accepted Answer

Motor efficiency is unchanged; lower feeder current can reduce upstream conductor losses.

Answer

Motor efficiency improved because less feeder current supplies the same shaft output.

Answer

Motor energy use per hour fell in proportion to the decrease in feeder current.

Answer

Power-factor correction failed because the motor still requires the same real input power.

Question 7

On the schematic, TR's timed NO contact is the sole supply path to feeder contactor coil M2, whose supply remains available. TR is a nonretentive 6-second on-delay relay. Its coil is energized at t = 0 s, deenergized at t = 4 s, then reenergized at t = 7 s and left on. Ignoring operating tolerances, when is voltage first applied to M2?

Accepted Answer

t = 13 s

Answer

t = 6 s

Answer

t = 7 s

Answer

t = 9 s

Question 8

Under a documented group lockout, isolation keys are secured in a lockbox and an electrician and mechanic each have a personal lock attached. The electrician has finished all assigned work, removed their tools, left the work area, and completed checkout with the group coordinator. The mechanic will continue under the unchanged, verified isolation. How should the electrician leave the group lockout?

Accepted Answer

Remove the electrician's own lock; retain the mechanic's lock and group isolation.

Answer

Keep both personal locks attached until the entire shared job has been completed.

Answer

Stop the remaining work and repeat the group isolation with the mechanic alone.

Answer

Give the electrician's personal-lock key to the mechanic until the whole job ends.

Question 9

Three 120 V AC contactors must pick up simultaneously. Their combined sealed burden is 60 VA. A proposed 100 VA control transformer has a nominal 120 V secondary, but its regulation data predict 94 V during simultaneous pickup; the coils require at least 102 V. Primary voltage, tap selection, and wiring are correct. Assess the transformer for this duty.

Accepted Answer

The continuous load is covered, but the pickup voltage is inadequate.

Answer

Its 40 VA of unused continuous capacity is sufficient to cover the brief pickup demand.

Answer

The matching 120 V ratings establish that its voltage is sufficient during pickup.

Answer

A recovery in voltage after the contactors seal makes the temporary pickup deficit acceptable.

Question 10

A three-phase fan motor loses torque but keeps turning. Approved testing verifies line currents of 18 A, 18 A, and 0 A, measured one conductor at a time; normal current is 12 A per line. A voltmeter nevertheless indicates voltage at all three motor terminals. Which response addresses the fault without assuming its location?

Accepted Answer

Stop and isolate the motor, then locate the open phase.

Answer

Reduce the load and reassess the motor while it runs.

Answer

Replace the motor; the readings prove an internal winding failure.

Answer

Continue operation; terminal voltage confirms all three phases are healthy.

Free FESTO-L2-AIMC Practice Questions

Domain 1: Industrial Electrical Safety

Question 1

Question 2

Domain 2: Component Operation and Function

Question 3

Question 4

Domain 3: Motor Circuit Construction

Question 5

Question 6

Domain 4: Troubleshooting and Diagnostics

Question 7

Question 8

Domain 5: Control Schematic Interpretation

Question 9

Domain 6: Motor Protection and Efficiency Strategies

Question 10

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