TECHNICAL ASSISTANT
KERALA AGRO MACHINERY CORPORATION LTD
(CATEGORY NO. 387/2010)
Different Systems of I.C. Engines, Classification, I.C. Engine components, S.I.
Engine Fuel System Types, S.I. Engine Ignition types, description, Components. Cooling
System of I.C. Engines –Radiator, Thermostat, temperature indicator, water pump etc. – I.C.
Engine lubrication, types and description of parts, properties of lubricants. C.I. engine fuel
system, governing systems, Emission of automobiles, pollution control techniques, control
limits, sources of noise, control methods, Automobile electrical systems.
Transmission system in Automobiles – Types of clutches, function, description of
parts – Gear box – types, function, parts – Propeller shaft, Universal Joint –type, Final
Drive, differential, working of suspension system, brakes, steering, steering geometry,
troubles in transmission, steering, brakes etc. & remedies.
2 Tractor Mechanism
Classification of Tractors – main component parts of tractor, tractor controls,
starting of tractor engine. Stop and shift type tractor transmission. On the Go (Power) shift
type tractor transmission. Driving axles for general purpose, wheeled tractor, driving axles
for row crop tractors. Rear axles of crawler tractor – running gear of crawler tractor,
Frame and suspension of wheeled tractor.
Working attachment of tractor.
- General design of hydraulic lift linkage system
- Hydraulic system components
- Hydraulic control (selector) valve
- Hitch linkages – Drawber Hitch
- Traction boosters
- Automatic Draft and/or Position control system
- Power take off shafts and Belt pulley
Auxiliary equipments, trailers and body tipping mechanisms, steering and braking systems in
tractor.
3 Material Science
Properties of materials – impact strength , fatigue, creep resistance, malleability,
toughness etc. Mechanism of grain formation. Effect of rate of cooling on grain size,
effect of grain size on mechanical properties, factors promoting fine grain. Heat treatment
of metals, need for heat treatment, description of different processes and their applications,
annealing, tempering, hardening, case hardening, normalizing and nitriding. Alloy steels –
need for alloying element – effect of alloying on properties. Different types of stainless
steals, specific properties, uses of types of steels, non-ferrous metals and alloys – commercial
specification and uses of alloys of copper, aluminium , non- metallic materials –
characteristics of plastic, fiber glass and synthetic polymers.
4 Thermodynamics
Thermodynamic system, thermodynamic properties, boundary state, processes,
internal energy, flow of work, heat, enthalpy, first and second law of thermodynamics.
Specific heat at constant volume and at constant pressure. Establish the relationship
between specific heat and gas constant. Derivation of formulae for work, heat, change in
internal energy, relation between pressure, volume and temperature during constant volume.
Constant pressure, constant temperature, adiabatic and polytropic processes. Power
developed in IC engines, Indicator diagram and measurement of mean effective pressure.
Engine indicators, indicated power, brake power, friction power, indicated thermal
efficiency, brake thermal efficiency, volumetric efficiency, specific fuel consumption, Morse
text and preparation of heat balance sheet. Air compressor, use of compressed air,
classification of air compressors – working of single stage and multi stage air compressors.
Inter cooler. Principles of heat transfer – Modes of heat transfer and field of application of
heat transfer, Thermal conduction, Fourier’s law of thermal conduction, thermal
conductivity, condition through plain wall, composite plain wall - simple problems.
Thermal radiation, reflection, absorption and transmission radiation. Absorptivity,
reflectivity and transmitivity. Concept of black body, concept of grey body and white body.
Free convection, and forced convection. Basic principles and heat exchanger. Evaporator
and condenser.
5 Strength of Materials
Direct stresses of strains, shear stress and shear strain, Thermal stress and strain.
Friction – types of friction, Angle of friction, co-efficient of friction, cone of friction, laws
of friction, static friction and kinetic friction. Force analysis of sliding body resting on
horizontal plane. Force acting along plane and at an angle. Centre of gravity of sections.
Centroids – centre of gravity. Axis of symmetry and axis of reference. Methods to find
centre of gravity. Simple geometric sections as rectangle, circle and semi circle sections.
Moments of inertia. Bending moment and shear force diagram.
6 Design of machine elements
Procedure of designing – permanent fastening – riveted and welded joints.
Temporary fastenings – Screws, Nuts and Bolts. Keys, Cotters, coupling and bearing
designs. Design of belt, rope,chain and gear drive, shaft, axles and springs. Kinematic pair,
chain and mechanism, governor and fly wheels. Screwjack, Clutch, Cams, Followers,
Balancing, Vibration.
7 Hydraulics and Pneumatics
Hydrostatics, Hydrodynamics, Hydro kinematics, Properties of fluids- Mass density,
weight density , specific volume of gravity, viscosity, Newtons’s theory of viscosity,
kinematic viscosity, compressibility, cohesion, adhesion, surface tension etc. Types of fluids
– Ideal fluid, Real fluid, Newtonian fluid. Fluid pressure and its measurement – Manometer,
Buoyancy and floatation. Kinematic and Dynamics of fluid flow – types of fluid flows,
continuity equation of liquid flow, Bernoulli’s equation, Venchurimeter, Orifice meter, flow
through orifice and notches, vena contracts, discharge through orifice, notches – triangular,
rectangular etc. Flow through pipes and nozzles, Fluid power – Hydraulic system. Working
of positive displacement pumps. Hydraulic control elements and components – Hydraulic
circuits – Pneumatic system – pneumatic control elements and components, Pneumatic
circuits.
8 Production process of Components
Measuring instruments – Foundry – Pattern making and materials, Classification of
pattern and pattern allowances, Moulding operation, types of moulding, casting methods,
different types of steel making processes – open hearth process, Bessemes process, L.D.
process, forging operation – open hearth, closed hearth, furnaces – cold working processes –
drawing squeezing, bending, shearing, cutting, blanking, extruding, shot pressing, Hot
working – Rolling, drawing, extruding. Welding, Arc welding, submerged welding, thermit
welding, Gas welding resistance welding, TIG and MIG welding, soldering, brazing.
Machine tools – lathe, dyes, cylindrical turning, paper calculation, thread cutting basics.
Other operation on lathe – drilling, boring, reeming, key way cutting, knurling. N.C. and
C.N.C. machines, drilling machine, shaping machine, quick return mechanism, crank and
slotted lever mechanism, slotting machines, grinding machine – types, grinding wheels,
milling machine- Fundamentals of Gear manufacturing - indexing methods, gear milling,
gear hibbing .
9...Basic electrical and electronics engineering
Lead acid cell – charging, discharging, parts, types etc. Principles of wiring,
constructional aspects of DC generator, types based on field connection. DC motors,
application, types, principles of operation, stepper motors, alternating quantities, phase
differences, inductance, capacitance, impedance, current calculation in R.L.C. series circuit –
calculation of power and power factor. AC 3 phase circuits – star, delta connection, voltage
and current relation, expressions for power transformers, single phase transformers, 3 phase
transformers, auto transformers, AC generators, induction motor application, starting of
squirrel cage and slip ring induction motors, single phase induction motors, Measuring
instruments – moving coil, moving iron voltmeter, ammeter, dynamometer, type wattmeter
– Introduction to electronics – passive components – resistor types – capacitor types –
colour coding, Inductor types – symbolic representation of passive components, semi
conductor – intrinsic and extrinsic, P-type, N-type, formation and working of PN junction.
Active components – diodes, BJT, FET, SCR, Diac, Triac, UJT, Principles of working of
BJT. Configuration , rectifiers – half wave and full wave, C&L filters, Ripple factor,
Amplifier, gain, band width, oscillators, condition of oscillators, fundamentals of digital
electronics – logic gates, AND, OR, NOT, X-OR, Boolean algebra, simplification of
expression – De-Morgans theorem, Universal gates, NAND, NOR
NOTE: - It may be noted that apart from the topics detailed above, questions from other topics prescribed for the educational qualification of the post may also appear in the question paper. There is no undertaking that all the topics above may be covered in the question paper.
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