ASRB NET — Farm Machinery & Power / Land & Water Management Engineering / Agricultural Structures & Process Engineering · India · Agricultural Scientists Recruitment Board (ICAR)
Original practice questions written to the published syllabus · not past papersASRB NET — Farm Machinery & Power / Land & Water Management Engineering / Agricultural Structures & Process Engineering is a specialist certification exam run by Agricultural Scientists Recruitment Board (ICAR), for candidates in India. NET: 150 MCQs, 150 marks, 2 hours, −1/3 per wrong answer, English/Hindi, PG level. Combined NET/ARS/SMS/STO recruitment runs prelims, mains and interview.
Official site: pw.live.
We have not been able to confirm these details against the exam body's own specification, so fees, dates and pass marks are left out on purpose. Check the current format, eligibility, fees and dates on the official site.
How tractor engines work and how their performance is measured — the single most reliably examined farm-power topic.
Our 17 ASRB NET questions in this subject: 4 easy, 11 medium, 2 hard, across 12 units.
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
These 10 were written to ASRB NET and are not shown on any other exam's page.
Valve overlap in a four-stroke engine occurs
C. near exhaust TDC, with both valves open
The inlet opens before TDC and the exhaust closes after TDC, so both are open around exhaust TDC. At compression TDC both valves are closed; the early exhaust opening near BDC is exhaust lead, not overlap.
In a helix-controlled in-line injection pump, the quantity of fuel injected per stroke is changed by
A. rotating the plunger with the control rack, which changes the effective stroke
The rack rotates the plunger so the helix uncovers the spill port earlier or later, varying effective stroke. Total plunger lift is fixed by the cam; injector opening pressure does not meter quantity.
Pre-ignition in an SI engine differs from detonation in that pre-ignition is
D. ignition of the charge by a hot surface before the spark occurs
Pre-ignition is started by a glowing deposit, valve or plug before the spark. Detonation (knock) is autoignition of end gas after normal spark ignition.
The wastegate on a turbocharger
D. lets some exhaust bypass the turbine to limit boost pressure
At high speed and load the wastegate opens so the turbine does not overspeed and boost stays within limits. Cooling the charge is the intercooler's job.
In an alternator, the AC generated in the stator is converted to DC for the battery by
D. a diode bridge
Diodes rectify the three-phase output; the regulator controls field current to hold system voltage. A commutator belongs to a dynamo; a cut-out relay was used with dynamos.
Biodiesel (fatty-acid methyl ester) is produced from vegetable oil by
B. transesterification with methanol
Triglycerides react with methanol over a catalyst to form methyl esters and glycerol. Fermentation makes ethanol.
Which dynamometer can both absorb an engine's power and drive (motor) the engine for a friction test?
D. An electric (DC swinging-field or AC) dynamometer
Electric machines work as generators to absorb power and as motors to drive the engine. Eddy-current, hydraulic and friction brakes can only absorb.
The OECD Standard Code that covers official testing of agricultural tractor performance (PTO power, fuel consumption, drawbar, hydraulic lift) is
D. Code 2
Code 2 is the performance test code. Other codes cover noise at the driver's position (Code 5) and protective structures such as ROPS and FOPS (Codes 3, 4, 6, 7, 8 and 10).
Selective catalytic reduction (SCR) on a modern tractor diesel reduces
A. NOx, using an aqueous urea solution that forms ammonia
Urea (about 32.5% in water) decomposes to ammonia, which reduces NOx to nitrogen and water over the SCR catalyst. Soot is trapped by the DPF; CO and HC are oxidised by the DOC.
Which new kind of limit did the EU Stage V rules for non-road engines add for most power bands, beyond the mass of particulate matter?
D. A limit on particle number (count)
Stage V (Regulation (EU) 2016/1628) introduced particle-number limits for most power ranges, which in practice requires a wall-flow particulate filter. Check the regulation for the exact bands and values.
This plan follows where our questions actually fall, so the time goes where the marks are likely to be. It is our reading of the syllabus, not the exam body's weighting.
Read the manual chapters for these first and do every worked question you can find on them.
Aim for one sitting per unit, then mixed questions across them.
Learn the definitions, classifications and standard numbers; these units are more often recalled than worked.
Come back to these after a first pass, untimed, and read every explanation, including for the options you rejected.
Do these early in revision so they are fast on the day.
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