Free ACE-ALM Practice Questions

Question 1

After heavy rain, six consecutive runway edge lights are dark while the other lights on the same series circuit remain at normal brightness. A calibrated true-RMS instrument confirms 6.6 A at the constant current regulator (CCR). Subsequent testing under lockout finds a marked drop in primary-to-earth insulation resistance compared with earlier tests made under comparable conditions. Which fault best explains this combination?

Accepted Answer

Two primary-to-earth faults bypassing the affected section

Answer

A single open conductor in the primary series loop

Answer

A low-current command applied to the entire lighting circuit

Answer

An open lamp filament in the first dark fixture

Question 2

An inspection crew checks the lights in a section with 1,600 feet remaining on an 8,000-foot instrument runway. Viewed in the landing direction, the edge lights in that section show yellow and the centerline lights alternate red and white. How should these color observations be recorded?

Accepted Answer

Both patterns are correct at this point on the runway.

Answer

Edge lights incorrect; centerline colors correct.

Answer

Edge colors correct; centerline should be solid red.

Answer

Both patterns are wrong; the edge lights should be white and the centerline lights red.

Question 3

A five-step, 6.6 A constant current regulator is being checked against FAA AC 150/5345-10H. At Step 4, a suitable calibrated true-RMS instrument reads 5.24 A, with a maximum measurement error of 0.01 A. What should the technician do about this reading?

Accepted Answer

Accept the reading as within the Step 4 current tolerance.

Answer

Withdraw the CCR; any output above 5.20 A violates the Step 4 limit.

Answer

Set Step 4 to 5.50 A, the correct intermediate current.

Answer

Investigate failed overcurrent protection at this output.

Question 4

Stores must issue an in-kind replacement for a failed isolation transformer on a 60 Hz airfield circuit. The approved ratings are 100 W, 20 A primary, and 6.6 A secondary. Which FAA transformer type matches all of these ratings?

Accepted Answer

L-830-5

Answer

L-830-4

Answer

L-831-5

Answer

L-830-7

Question 5

Just after ATC clears a maintenance vehicle to cross an active runway, the runway entrance lights illuminate red. The vehicle is still stopped behind the holding position, and the driver cannot see any approaching traffic. What is the appropriate response?

Accepted Answer

Remain stopped and ask ATC to resolve the conflicting indication.

Answer

Cross under the existing clearance and report the conflicting lights afterward.

Answer

Cross after visually confirming that the runway is clear.

Answer

Wait for the lights to extinguish, then cross without reporting the conflict.

Question 6

A connector identified as a hot spot is removed during a coordinated outage. Testing establishes a contact resistance of 0.75 ohm at its operating temperature. Before isolation, the CCR maintained 6.6 A RMS through the connector. Which estimate and interpretation fit its resistive heat loss during operation?

Accepted Answer

About 33 W; normal loop current can coexist with damaging local heating.

Answer

About 5 W; heat loss equals current multiplied by resistance.

Answer

About 58 W; heat loss equals current squared divided by resistance.

Answer

About 33 W; stable loop current establishes that the connector is operating normally.

Question 7

As part of an approved test of an L-880 four-unit PAPI, a technician activates the tilt switch in one light unit. All four units extinguish 20 seconds later while the incoming supply remains normal. How does this response compare with FAA AC 150/5345-28H?

Accepted Answer

It meets the whole-system shutdown and time-delay requirements.

Answer

The controller has failed; only the unit with the activated tilt switch should extinguish.

Answer

The delay is faulty; shutdown must occur immediately.

Answer

The sensing circuit is miswired; tilt detection should produce an alarm without extinguishing lamps.

Question 8

An isolated, unbranched airfield control cable extends 1,600 m from the vault. Its verified pulse propagation velocity is 160 m per microsecond. A time-domain reflectometer records an abnormal reflection 4.5 microseconds after transmission; this is the round-trip time. Along the documented cable route, handholes A, B, and C are 250 m, 450 m, and 650 m from the vault. Where is the indicated discontinuity?

Accepted Answer

About 360 m from the vault, between handholes A and B.

Answer

About 180 m from the vault, before handhole A.

Answer

About 720 m from the vault, beyond handhole C.

Answer

About 1,440 m from the vault, beyond handhole C.

Question 9

A replacement sign assembly must tell a pilot that the aircraft is on Taxiway B and that Taxiway D is reached by turning left. Considering inscription and background colors, which pairing correctly distinguishes the location panel from the direction panel?

Accepted Answer

Yellow B on black; black D and left arrow on yellow.

Answer

Black B on yellow; yellow D and left arrow on black.

Answer

Yellow B on black; white D and left arrow on red.

Answer

White B on red; black D and left arrow on yellow.

Question 10

Two of the six bolts securing an in-pavement light fail inspection. The other four bolts pass, the fixture remains properly seated, and the repair will not involve lifting it from its base. Under the phased-replacement guidance in FAA Engineering Brief 83A, what is the minimum hardware replacement needed?

Accepted Answer

Replace the two rejected bolts in kind, with new two-part locking washer sets.

Answer

Replace all six bolts and renew all six two-part locking washer sets.

Answer

Replace the two rejected bolts in kind and reuse their undamaged two-part washer sets.

Answer

Replace the two rejected bolts and fit new split lock washers of matching diameter.

Free ACE-ALM Practice Questions

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

That's 10 of 1,030