ICAR AIEEA-PG — Agricultural Engineering & Technology (Major Subject Group 10) · India · National Testing Agency for ICAR
Original practice questions written to the published syllabus · not past papersEverything between the engine and the implement: clutch, gearbox, differential, PTO, brakes, steering, hydraulics, hitch and tyres.
In the exams: GATE AG Section 3 Tractors and Power Tillers; ICAR AIEEA-PG Unit V; ICAR AICE subject 39 Unit 4; ASRB NET FMP; PRC ABE
ICAR AIEEA-PG — Agricultural Engineering & Technology
Unit V farm power: identification of transmission components and their functions, PTO standards, hitch categories, brakes and steering types, hydraulic control modes, power tillers; mostly recall with short calculations.
How our questions for ICAR AIEEA-PG spread across the units of Tractor Systems & Controls. Difficulty: 24 easy, 30 medium, 0 hard.
| Gearbox and transmission: sliding, constant and synchromesh | 7 | |
| Differential and differential lock | 5 | |
| Power take-off: standards and speeds | 5 | |
| Steering geometry (Ackermann) and power steering | 5 | |
| Hydraulic system: open and closed centre | 4 | |
| Tractor types and selection | 4 | |
| Draft and position control | 4 | |
| Clutch: single and dual plate | 3 | |
| Final drive | 3 | |
| Brakes | 3 | |
| Tyres and ballasting | 3 | |
| Power tillers | 3 | |
| Three-point hitch: categories, free and restrained links | 2 | |
| Operator controls and ROPS | 2 | |
| CVT and power-shift transmissions | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
In a two-stage reduction, a 15-tooth pinion on the input shaft drives a 45-tooth gear on the countershaft, and a 12-tooth pinion on the countershaft drives a 48-tooth gear on the output shaft. If the input turns at 1,800 rev/min, the output speed is
D. 150 rev/min
Ratio = (45/15) × (48/12) = 3 × 4 = 12. Output = 1,800/12 = 150 rev/min. Adding the ratios (3 + 4 = 7) gives 257; using only the first stage gives 600; multiplying instead of dividing gives 21,600.
A single-plate clutch has linings of outer radius 150 mm and inner radius 100 mm, μ = 0.3, and spring force 4000 N. Assuming uniform wear, the torque capacity is
C. 300 N·m
Uniform wear: R_m = (R_o + R_i)/2 = 0.125 m. T = μ W n R_m = 0.3 × 4000 × 2 × 0.125 = 300 N·m (n = 2 because the single driven plate has two friction faces). Uniform pressure gives R_m = 0.1267 m and 304 N·m; n = 1 gives 150 N·m; using the outer radius gives 360 N·m.
A PTO dynamometer reads 250 N·m at 540 rev/min. The PTO power is
D. 14.14 kW
P = 2πNT/60,000 = 2π × 540 × 250/60,000 = 14.14 kW. Leaving out 2π gives 2.25; assuming a 1,000 rev/min shaft gives 26.18; not dividing rev/min by 60 gives a value sixty times too large.
A power tiller engine runs at 2200 rev/min; the overall reduction to the wheels is 60:1 and the pneumatic wheel diameter is 0.6 m. The theoretical forward speed is
A. 4.15 km/h
Wheel speed = 2200/60 = 36.67 rev/min. v = πDN = π × 0.6 × 36.67 = 69.1 m/min = 4.15 km/h. Treating 0.6 m as a radius doubles it; 1.15 is in m/s; 69.1 is m/min mislabelled.
The main advantage of a track-type tractor over a wheeled tractor of similar mass on soft soil is
B. lower ground pressure and higher tractive efficiency from a long contact patch
Tracks spread the load over a long, flat contact patch, lowering contact pressure and slip on soft soil. Tracks are slower on the road, cost more, and turn by skid steering, which disturbs soil.
A row-crop tractor differs from a general utility tractor mainly in having
B. high crop clearance and adjustable track width to straddle crop rows
Row-crop tractors are built to work between and over crop rows: high clearance and adjustable wheel track. Low and narrow build is the orchard tractor.
The synchroniser in a synchromesh gearbox
B. uses a cone clutch to match speeds before the dogs engage
The synchro ring rubs on the gear cone to bring both to the same speed, then the collar's dogs engage without clash, allowing shifts on the move.
A 35 mm PTO shaft with 21 splines is designed to run at
A. 1,000 rev/min
Type 1 is 35 mm with 6 splines at 540 rev/min; type 2 is 35 mm with 21 splines at 1,000 rev/min; type 3 is 45 mm with 20 splines at 1,000 rev/min. Different splines prevent mismatching.
In a hydrostatic power steering system, if the engine stops while moving
C. it can still be steered, with more effort, because the metering unit acts as a hand pump
The orbital metering unit contains a gerotor set that pumps oil to the cylinder when turned by hand, giving emergency steering without engine power.
The recirculating-ball steering gear uses balls
C. running between a worm and a nut to reduce friction
Steel balls roll in the grooves between the worm and nut and recirculate through a return tube, giving low friction and wear.
Ten here, 54 in the app. The Laisha app has every practice question we have written to ICAR AIEEA-PG 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.
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