Landbased Technician Accreditation (LTA 1–4) · United Kingdom · IAgrE for the AEA industry scheme
Original practice questions written to the published syllabus · not past papersUsing positioning, sensing and variable-rate control to manage fields by the metre instead of by the hectare.
In the exams: ICAR AICE subject 43 Unit 8; elective in the ICAR 6th Deans' Committee B.Tech
UK IAgrE registration and Landbased Technician Accreditation
Practical competence: setting up guidance offsets and look-ahead times, ISOBUS fault finding, yield monitor calibration, and advising customers on system compatibility and data.
How our questions for Landbased Technician Accreditation spread across the units of Precision Agriculture & System Management. Difficulty: 8 easy, 14 medium, 2 hard.
| ISOBUS basics | 6 | |
| Auto-steer and guidance | 4 | |
| Section control | 4 | |
| GNSS and RTK positioning | 3 | |
| Yield monitoring | 3 | |
| Farm data management | 2 | |
| Prescription maps | 1 | |
| Proximal and remote sensing for crops | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
What distinguishes real-time kinematic (RTK) positioning from ordinary code-based GNSS?
C. It resolves carrier-phase ambiguities using data from a nearby base station
RTK uses the carrier phase and corrections from a base at a known point to fix integer ambiguities, giving about 1–2.5 cm. Wide-area geostationary corrections describe SBAS, which gives sub-metre accuracy; averaging code ranges or using Doppler does not reach centimetre level.
A tractor's GNSS antenna is 3.5 m above the ground. On a side slope the tractor rolls 4°. Without terrain compensation the lateral position error at ground level is about
A. 0.24 m
Lateral offset = h × sin θ = 3.5 × sin 4° = 3.5 × 0.0698 = 0.24 m. 3.49 m uses cos θ; 14 m multiplies height by degrees; 0.0085 m is h(1 − cos θ), the vertical drop, not the sideways shift.
An auto-steer tractor weaves continually from side to side across its line on a smooth field. The most likely setting to change is
A. Steering aggressiveness, the gain, is too high; reduce it
Oscillation about the line is the classic sign of an over-aggressive steering gain; reducing it damps the response. Correction age, zero antenna height and deliberately degrading accuracy do not address a control-loop oscillation.
How is yield usually monitored on a forage harvester, which has no clean-grain elevator?
C. From throughput measured at the feed rolls or by crop-flow sensors in the spout
Forage harvesters estimate throughput from feed-roll displacement or crop-flow sensors, often with on-board near-infrared sensing of dry matter. They have no grain elevator; fuel use and imagery are not the standard yield measurements.
Besides saving input, why is the as-applied coverage map from section control useful to a farm business?
B. It is a record of what product was applied, where and at what rate, for compliance
The coverage map is an as-applied record usable for pesticide records, buyer audits and buffer-zone checks. It does not replace calibration or yield measurement and is unrelated to correction subscriptions.
ISOBUS is the common name for which international standard?
C. ISO 11783
ISO 11783 defines the serial control and communications data network for tractors and implements. ISO 9001 and 14001 are management-system standards; ISO 730 covers the three-point linkage.
ISOBUS is built on which network technology and at what bit rate?
C. CAN with 29-bit identifiers at 250 kbit/s
ISO 11783 uses CAN 2.0B extended frames with 29-bit identifiers at 250 kbit/s, following SAE J1939. 11-bit identifiers at 1 Mbit/s is typical of other CAN uses; Ethernet and RS-232 are not the ISOBUS physical layer.
Which AEF ISOBUS functionality lets an implement control certain tractor functions, such as speed or hydraulics, under defined safety rules?
D. TIM
Tractor Implement Management (TIM) lets the implement command tractor functions. TC-BAS records totals, AUX is auxiliary control such as a joystick, and UT is the universal (virtual) terminal.
A spreader's as-applied file is imported with the rate interpreted as lb/acre instead of kg/ha. What happens to the reported rates?
C. Every rate is wrong by a factor of about 1.12, so totals and costs are misreported
1 lb/acre = 1.12 kg/ha, so mislabelled units give values about 12 % out — small enough to go unnoticed, which is why units must be carried in metadata. Software cannot convert what it misreads, boundaries are separate, and the factor is not 10.
Ten here, 24 in the app. The Laisha app has every practice question we have written to Landbased Technician Accreditation in this subject, marked as you go, with timed papers, a jump-to-unanswered list and a certificate when you pass at 70 per cent.
Free for ten days, then one subscription of US$10 a month. We would rather say so here than have you find it later.
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