Farm Machinery Training & Testing Institutes (Budni, Hisar, Anantapur, Biswanath Chariali)

India · Ministry of Agriculture & Farmers Welfare, Government of India · professional · secondary source

276practice questions written to this syllabus
15subjects

Format

Not an exam: short training courses and machinery testing (commercial, batch, confidential, CMVR).

Sections

Over the years

Listed because testing to these institutes' procedures is a professional skill. The main site refused connection during research; OECD accreditation of CFMTTI Budni is from a search snippet and needs re-verification.

Official source: https://nerfmtti.nic.in/

Subjects this exam draws on

Engineering Mechanics (Statics & Dynamics)10 questionsEngineering Drawing, Graphics & CAD27 questionsWorkshop Technology & Manufacturing27 questionsEngineering Thermodynamics1 questionsTheory of Machines1 questionsFarm Machinery & Equipment I — Tillage, Sowing, Planting, Fertiliser10 questionsFarm Machinery & Equipment II — Plant Protection, Harvesting, Threshing9 questionsTractor & Automotive Engines (IC Engines)33 questionsTractor Systems & Controls23 questionsMechanics of Tillage & Traction (Soil Dynamics)11 questionsFarm Machinery Testing, Evaluation & Standards23 questionsFarm Machinery Management & Economics15 questionsHuman Engineering, Ergonomics & Safety15 questionsHydraulic Drives & Controls41 questionsAgricultural Drones, Robotics & Automation30 questions

Five practice questions, worked

Original questions written to this exam's published syllabus and pattern. Not past papers.

1. An operator ties a chain to a tractor's rear axle housing, well above the drawbar, to pull out a stuck log. Why is this dangerous?

  1. The high hitch lowers the rolling resistance, so the tractor accelerates too fast when the log frees
  2. The high hitch gives the pull a large moment about the rear wheels, which can flip the tractor backward
  3. The high hitch puts the chain in compression, so it may buckle and whip back at the operator
  4. The high hitch moves the tractor's centre of gravity forward, so the front wheels may dig in
Answer and working

B. The high hitch gives the pull a large moment about the rear wheels, which can flip the tractor backward

The overturning moment of the pull about the rear-wheel contact is P x hitch height. Raising the hitch raises that moment and reduces the pull at which the front axle unloads. If the log does not move, the axle torque rotates the chassis backward about the wheels. Pulls must be taken from the drawbar, low and behind the axle.

Engineering Mechanics (Statics & Dynamics) · Free-body diagrams and equilibrium

2. A dimension is given as 50 +0.05 / −0.02 mm. What are the upper limit, lower limit and tolerance?

  1. 50.05 mm, 49.98 mm, 0.03 mm
  2. 50.05 mm, 49.98 mm, 0.07 mm
  3. 50.05 mm, 50.02 mm, 0.03 mm
  4. 50.02 mm, 49.95 mm, 0.07 mm
Answer and working

B. 50.05 mm, 49.98 mm, 0.07 mm

Upper = 50 + 0.05 = 50.05; lower = 50 − 0.02 = 49.98; tolerance = 50.05 − 49.98 = 0.07 mm. 0.03 mm subtracts the deviations instead of spanning them.

Engineering Drawing, Graphics & CAD · Dimensioning and tolerances

3. A forged drawbar hook outlasts an identical hook machined from solid bar in fatigue tests. What is the main reason?

  1. Forging adds carbon to the surface of the hook from the coke fire in the hearth
  2. Forging makes the grain flow follow the hook's contour instead of being cut across
  3. Forged steel is always a higher-grade alloy than the steel sold as round bar stock
  4. Hammering leaves the forged hook fully hardened, so it needs no later heat treatment
Answer and working

B. Forging makes the grain flow follow the hook's contour instead of being cut across

Hot forging bends the fibrous grain flow of the bar around the shape, so cracks must cross the grain; machining from bar cuts the grain lines and exposes their ends at the surface. Forging does not carburise the steel in a meaningful way, does not change the grade, and does not by itself harden it.

Workshop Technology & Manufacturing · Fitting, carpentry and smithy

4. A tractor diesel engine's measured brake thermal efficiency is far below its air-standard Diesel-cycle efficiency. Which factor contributes to that gap?

  1. Heat lost to cylinder walls and coolant during combustion and expansion
  2. Using air as the working fluid instead of the actual combustion gases
  3. Assuming the compression stroke is isentropic in the air-standard model
  4. The higher compression ratio of diesel engines compared with petrol engines
Answer and working

A. Heat lost to cylinder walls and coolant during combustion and expansion

Real losses include wall heat transfer, variable specific heats, finite combustion time, blowdown, pumping and friction. The air-as-fluid and isentropic assumptions belong to the model, not the engine, and a higher compression ratio raises, not lowers, efficiency.

Engineering Thermodynamics · Air-standard cycles: Otto, Diesel, dual and Brayton

5. During a tractor PTO test a hydraulic dynamometer records a torque of 180 N m at the standard PTO speed of 540 rpm. What PTO power is being delivered?

  1. 97.2 kW
  2. 13.64 kW
  3. 18.85 kW
  4. 10.18 kW
Answer and working

D. 10.18 kW

P = 2πNT/60 = 2π x 540 x 180/60 = 10179 W = 10.18 kW. Omitting 2π/60 gives 97.2; 13.64 is the power in horsepower mislabelled as kW; 18.85 kW uses the 1000 rpm PTO standard instead of 540.

Theory of Machines · Brakes and dynamometers

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