PSC Buddy
100 questions with answersProvisional keyKerala PSC Exam

Junior Instructor Mechanical Agricultural Machinery (SR for ST only) - Industrial Training question paper 2023

Date of test
30-09-2023
Question paper code
154/2023/OL
Questions
100
Answer key
Provisional Answer Key
Exam mode
Online (computer based)

Provisional key. Kerala PSC can change answers after reviewing complaints; the final key decides the marks.

See questions with answersPractise as a mock test

Source: Kerala PSC (keralapsc.gov.in) · official document· Last updated 25 Sept 2026· How we check content

Official PDFs

As published by the Kerala Public Service Commission.

All 100 questions with answers

Tap an option to check yourself, or open the answer. Answers follow the official Kerala PSC answer key.

  1. 1.
    Fire extinguisher can be used with fire on electrical equipment.
    Show answer and explanation
    Answer: A —
    Halon extinguishers
    Halon extinguishers are suitable for electrical fires as they do not leave residue and are non-conductive.
    Report a mistake
  2. 2.
    In which class of fire includes "Fire on electrical equipment?
    Show answer and explanation
    Answer: D —
    Class D fire
    Fires involving electrical equipment are classified under Class D fires (or Class C in some standards, but as per the answer key it is Option-D).
    Report a mistake
  3. 3.
    In ABC of first aid, 'B' stands for
    Show answer and explanation
    Answer: D —
    Breathing
    In the ABC of first aid, A stands for Airway, B stands for Breathing, and C stands for Circulation.
    Report a mistake
  4. 4.
    Choose the correct statement regarding ECOs.
    Show answer and explanation
    Answer: A —
    'Avoiding careless waste' belongs to minor ECOs
    Avoiding careless waste is classified under minor Energy Conservation Opportunities (ECOs).
    Report a mistake
  5. 5.
    Which one of the following is NOT a marking material?
    Show answer and explanation
    Answer: B —
    Lead sulphate
    Lead sulphate is not commonly used as a marking material in workshop practice.
    Report a mistake
  6. 6.
    Reading accuracy of engineer's steel rule.
    Show answer and explanation
    Answer: A —
    0.5 mm
    The least count or reading accuracy of a standard engineer's steel rule is 0.5 mm.
    Report a mistake
  7. 7.
    Choose the correct statement regarding clearance angle of chisel.
    Show answer and explanation
    Answer: C —
    The angle between the bottom face of the point and tangent to the work-surface
    Clearance angle is the angle between the bottom face of the chisel point and the tangent to the work-surface.
    Report a mistake
  8. 8.
    Which hammer is used to spread metal in one direction at right angles to the line of striking?
    Show answer and explanation
    Answer: A —
    Straight pein hammer
    Straight pein hammer has its pein parallel to the handle and is used for stretching and spreading metal.
    Report a mistake
  9. 9.
    Ratio between length and jaw width of a double end spanner.
    Show answer and explanation
    Answer: B —
    10:1
    The standard ratio between the length and jaw width of a double end spanner is 10:1.
    Report a mistake
  10. 10.
    Distance moved by the spindle with one revolution of a thimble in micrometer.
    Show answer and explanation
    Answer: B —
    0.5 mm
    With one complete revolution of the thimble, the micrometer spindle moves forward or backward by 0.5 mm (for a pitch of 0.5 mm).
    Report a mistake
  11. 11.
    How many blades are in the universal feeler gauge?
    Show answer and explanation
    Answer: D —
    25
    A universal feeler gauge set typically contains 25 blades.
    Report a mistake
  12. 12.
    Which material is used making for straight edge?
    Show answer and explanation
    Answer: B —
    Grey cast iron
    Grey cast iron is widely used for making straight edges due to its rigidity and dimensional stability.
    Report a mistake
  13. 13.
    Which is the indirect measuring tool?
    Show answer and explanation
    Answer: D —
    Telescopic gauge
    Telescopic gauges are indirect measuring tools used along with outside micrometers to measure internal dimensions.
    Report a mistake
  14. 14.
    The distance between adjacent teeth of hack saw blade is known as
    Show answer and explanation
    Answer: B —
    Pitch
    The distance between adjacent teeth of a hacksaw blade is called the pitch.
    Report a mistake
  15. 15.
    Which type of nut has an internal groove cut in which a fiber or nylon ring is inserted?
    Show answer and explanation
    Answer: D —
    Self locking nut
    A self-locking nut (such as a Nyloc nut) has a nylon insert to prevent loosening due to vibration.
    Report a mistake
  16. 16.
    In single cut file, what is the angle of teeth to center line?
    Show answer and explanation
    Answer: C —
    60°
    In a single cut file, the teeth are cut at an angle of 60° to the center line.
    Report a mistake
  17. 17.
    Which type of washers have made with serrations, cut and twisted?
    Show answer and explanation
    Answer: D —
    Toothed lock washer
    Toothed lock washers feature serrations, cuts, or twists to grip the mating surfaces and prevent loosening.
    Report a mistake
  18. 18.
    Which law states that the pressure of a liquid is transmitted equally in all directions?
    Show answer and explanation
    Answer: B —
    Pascal's law
    Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid.
    Report a mistake
  19. 19.
    Which action of liquid penetrant testing, the liquid penetrant dye seeps into the defects of material?
    Show answer and explanation
    Answer: B —
    Capillary
    Capillary action causes the liquid penetrant dye to be drawn into small surface cracks and defects.
    Report a mistake
  20. 20.
    How many ports have a 4/2 directional control hydraulic valve?
    Show answer and explanation
    Answer: A —
    Four
    A 4/2 valve has 4 ports and 2 switching positions.
    Report a mistake
  21. 21.
    What is meant by FRL unit in pneumatic system?
    Show answer and explanation
    Answer: C —
    Filter regulator lubricator
    FRL stands for Filter, Regulator, and Lubricator, which are essential for conditioning compressed air.
    Report a mistake
  22. 22.
    Which tool is mainly used to make external threading of a cylindrical component?
    Show answer and explanation
    Answer: D —
    Die
    A die is a tool used for cutting external threads on cylindrical workpieces.
    Report a mistake
  23. 23.
    Which part of a drill bit is mainly using to determine its diameter?
    Show answer and explanation
    Answer: D —
    Land
    The land is the cylindrical portion of the drill bit that maintains the diameter and guides the drill.
    Report a mistake
  24. 24.
    Which tool is used for chasing or reconditioning the damaged threads and it is not used for cutting new threads?
    Show answer and explanation
    Answer: A —
    Die nut
    A die nut is specifically designed for cleaning or reconditioning existing damaged threads.
    Report a mistake
  25. 25.
    Which vice is used for holding small diameter jobs, having a small collect chuck at one end and it carries a set of jaws which are operated by turning the handle?
    Show answer and explanation
    Answer: B —
    pin vice
    A pin vice is a small tool used for holding small diameter workpieces like wires or pins.
    Report a mistake
  26. 26.
    What is the name of an amber coloured substance of non-corrosive soldering flux extracted from pine tree sap?
    Show answer and explanation
    Answer: A —
    Resin
    Resin (rosin) is a natural flux derived from pine sap, commonly used in soldering electronics.
    Report a mistake
  27. 27.
    What is the other name of sheet metal seam called pittsburgh seam?
    Show answer and explanation
    Answer: C —
    Hammer lock seam
    The Pittsburgh seam is also known as the hammer lock seam in sheet metal work.
    Report a mistake
  28. 28.
    What is the shearing operation of a power press that circular holes are punched in a regular pattern or evenly spaced?
    Show answer and explanation
    Answer: D —
    Perforating
    Perforating is the process of punching a large number of small, closely spaced holes in a sheet.
    Report a mistake
  29. 29.
    What is the name of black iron sheet which is coated with lead on it?
    Show answer and explanation
    Answer: C —
    Terne sheet
    Terne sheet is a steel sheet coated with an alloy of lead and tin.
    Report a mistake
  30. 30.
    Where does electro-static shielding occur in a charged spherical shell?
    Show answer and explanation
    Answer: D —
    Electrical field inside spherical shell is zero
    Electrostatic shielding occurs because the electric field inside a closed conducting shell is zero.
    Report a mistake
  31. 31.
    Which of the following circuit cannot be analysed using Ohm's law?
    Show answer and explanation
    Answer: B —
    Unilateral
    Ohm's law applies to linear, bilateral circuits; unilateral components like diodes do not follow a linear V-I relationship.
    Report a mistake
  32. 32.
    Super position theorem is applicable for
    Show answer and explanation
    Answer: A —
    Linear bilateral network
    The superposition theorem is valid only for linear circuits.
    Report a mistake
  33. 33.
    Which type of meter is used to test the polarity of battery?
    Show answer and explanation
    Answer: C —
    Moving coil voltmeter
    Moving coil voltmeters are polarized and can indicate the polarity of a DC source.
    Report a mistake
  34. 34.
    An example of non ohmic resistance is
    Show answer and explanation
    Answer: B —
    Diode
    A diode is a non-ohmic device because its current-voltage relationship is non-linear.
    Report a mistake
  35. 35.
    In which material if the temperature is increased then the resistance will decreased?
    Show answer and explanation
    Answer: B —
    Carbon
    Carbon has a negative temperature coefficient of resistance, meaning its resistance decreases as temperature increases.
    Report a mistake
  36. 36.
    The SI unit of quantity of electricity is
    Show answer and explanation
    Answer: C —
    Coulomb
    Quantity of electricity (electric charge) is measured in Coulombs.
    Report a mistake
  37. 37.
    For the same rating which capacitor is physically smaller
    Show answer and explanation
    Answer: A —
    Ceramic capacitor
    Ceramic capacitors have a higher dielectric constant, making them physically smaller for the same capacitance and voltage rating compared to paper capacitors.
    Report a mistake
  38. 38.
    Two resistors are said to be connected in series when
    Show answer and explanation
    Answer: D —
    Same current passes in turn through both
    In a series connection, the same current passes sequentially through all components.
    Report a mistake
  39. 39.
    The energy in a lead acid battery is stored in the form of
    Show answer and explanation
    Answer: B —
    Chemical energy
    Batteries store energy in chemical form, which is converted to electrical energy during discharge.
    Report a mistake
  40. 40.
    Both the inductance and resistance of a coil are doubled the value of
    Show answer and explanation
    Answer: D —
    Time constant remains unchanged
    Time constant au=L/Rau = L/R. If both L and R are doubled, the ratio remains the same, so the time constant remains unchanged.
    Report a mistake
  41. 41.
    The phase difference between the primary and secondary voltage of a transformer is
    Show answer and explanation
    Answer: C —
    180 degree
    An ideal transformer exhibits a 180-degree phase difference between primary and secondary induced voltages due to Lenz's law.
    Report a mistake
  42. 42.
    Choose the correct relation
    Show answer and explanation
    Answer: C —
    Potential = charge/capacity
    The relationship is Q=CimesVQ = C imes V, which rearranges to V=QCV = \frac{Q}{C} (Potential = charge / capacity).
    Report a mistake
  43. 43.
    Which is the advanced version of power electronic component used in the output stage in drives?
    Show answer and explanation
    Answer: C —
    SCR
    Note: Official answer key specifies Option-C (SCR), though IGBT is commonly used in modern drives.
    Report a mistake
  44. 44.
    Why most of semi-conductor devices are made by silicon compared to Germanium?
    Show answer and explanation
    Answer: A —
    High barrier voltage
    Silicon has a higher barrier (forbidden energy gap / knee) voltage (approx 0.7V) compared to Germanium (approx 0.3V), resulting in lower leakage current at higher temperatures.
    Report a mistake
  45. 45.
    Which type of biasing is required to an npn transistor for amplification?
    Show answer and explanation
    Answer: C —
    Base positive, emitter negative and collector positive
    For active region operation (amplification), emitter-base is forward biased and collector-base is reverse biased, implying base is positive, emitter is negative, and collector is positive for an NPN transistor.
    Report a mistake
  46. 46.
    Which of the following logic gates gives high output with all its input low
    Show answer and explanation
    Answer: C —
    NOR
    A NOR gate gives a high output only when all its inputs are low.
    Report a mistake
  47. 47.
    The portion of weld joint that is melted by the heat of welding is called
    Show answer and explanation
    Answer: B —
    Puddle
    The molten pool of metal formed during welding is called the weld puddle.
    Report a mistake
  48. 48.
    The adding of iron powder to the electrode coating causes an increase in
    Show answer and explanation
    Answer: B —
    Metal deposition rate
    Iron powder in electrode coatings increases the metal deposition rate.
    Report a mistake
  49. 49.
    Which of the following is a batch furnance?
    Show answer and explanation
    Answer: C —
    Pit furnance
    Pit furnaces are typically operated as batch furnaces.
    Report a mistake
  50. 50.
    In reverse polarity
    Show answer and explanation
    Answer: B —
    Less weld penetration
    In reverse polarity (electrode positive), heat distribution results in less penetration compared to straight polarity.
    Report a mistake
  51. 51.
    Pre-ignition is caused by the burning of the fuel in the combustion chamber before the piston has reached the top dead centre, and is due to
    Show answer and explanation
    Answer: D —
    Any of the mentioned above
    Pre-ignition can be triggered by any hot spot in the combustion chamber such as overheated spark plug points or glowing carbon deposits.
    Report a mistake
  52. 52.
    Theoretically correct air fuel mixture in a spark ignition engine
    Show answer and explanation
    Answer: B —
    15:1
    The chemically correct (stoichiometric) air-fuel ratio for petrol engines is approximately 15:1.
    Report a mistake
  53. 53.
    The process of breaking up of a liquid into fine droplets by spraying is called
    Show answer and explanation
    Answer: C —
    Atomization
    Atomization is the process of converting bulk liquid into fine droplets.
    Report a mistake
  54. 54.
    Which engine can be operated both in clock-wise and counter clock-wise direction?
    Show answer and explanation
    Answer: A —
    T wo stroke engine
    Two-stroke engines can easily be run in either direction by altering the ignition timing or fuel injection timing, unlike conventional four-stroke engines limited by valve mechanisms.
    Report a mistake
  55. 55.
    The ignition quality of diesel fuel is indicated by
    Show answer and explanation
    Answer: C —
    Cetane number
    The ignition quality of diesel fuel is measured by its Cetane number.
    Report a mistake
  56. 56.
    The function of the compression ring is that it
    Show answer and explanation
    Answer: D —
    Maintains a seal and prevents escape of burned gases from the combustion chamber to sump
    Compression rings seal the combustion chamber to prevent high-pressure gases from leaking down into the crankcase.
    Report a mistake
  57. 57.
    A cylinder block is normally made of
    Show answer and explanation
    Answer: C —
    Cast iron
    Cylinder blocks are traditionally and most commonly cast from grey cast iron due to its wear resistance and rigidity.
    Report a mistake
  58. 58.
    In a four stroke diesel engine, the inlet valve
    Show answer and explanation
    Answer: B —
    Opens at 10° before T.D.C and closes at 35° after B.D.C.
    Valve timing incorporates lead and lag to improve volumetric efficiency; typically, the inlet valve opens before TDC and closes after BDC.
    Report a mistake
  59. 59.
    The oil pump used in the lubricating system of engine
    Show answer and explanation
    Answer: D —
    Any one of the above
    Gear pumps, rotor (trochoid) pumps, and plunger type pumps are all types of oil pumps used in engine lubrication systems.
    Report a mistake
  60. 60.
    The most common firing order in a straight six cylinder engine
    Show answer and explanation
    Answer: A —
    1-5-3-6-2-4
    The most common firing order for an in-line six-cylinder engine is 1-5-3-6-2-4.
    Report a mistake
  61. 61.
    Clutch works on principle of
    Show answer and explanation
    Answer: C —
    Friction
    A friction clutch operates on the principle of friction between contact surfaces to transmit torque.
    Report a mistake
  62. 62.
    The specific fuel consumption of diesel engine is
    Show answer and explanation
    Answer: B —
    200 gm/bhp/hr
    Typical specific fuel consumption of a standard diesel engine is around 200 gm/bhp/hr.
    Report a mistake
  63. 63.
    T oe-in provide in tractor is approximately
    Show answer and explanation
    Answer: A —
    4-8 mm
    The recommended toe-in for agricultural tractors is typically around 4 to 8 mm.
    Report a mistake
  64. 64.
    Hydraulic brake works on the principle of
    Show answer and explanation
    Answer: B —
    Pascal's law
    Hydraulic braking systems operate based on Pascal's law of transmission of fluid pressure.
    Report a mistake
  65. 65.
    A power tiller operates most satisfactory with
    Show answer and explanation
    Answer: D —
    Rotary tillage tool
    Power tillers are primarily designed to operate most efficiently and satisfactorily with rotary tillage tools (rotavators).
    Report a mistake
  66. 66.
    Weight transfer in a tractor implement system is caused by
    Show answer and explanation
    Answer: A —
    Application of pull
    Weight transfer from the front axle to the rear drive wheels in a tractor is primarily caused by the drawbar pull and implement draft.
    Report a mistake
  67. 67.
    An implement that fully supported by the tractor is
    Show answer and explanation
    Answer: B —
    Mounted implement
    Mounted implements are fully carried and supported by the tractor's three-point linkage.
    Report a mistake
  68. 68.
    The capacity of a battery is usually expressed in terms of
    Show answer and explanation
    Answer: D —
    Ampere hours
    Storage battery capacity is rated in Ampere-hours (Ah).
    Report a mistake
  69. 69.
    Relative movement of the wheel in direction of travel for given distance under load and no load condition is
    Show answer and explanation
    Answer: C —
    Wheel slip
    Wheel slip refers to the relative movement or difference in distance traveled per revolution under loaded versus unloaded conditions.
    Report a mistake
  70. 70.
    The parking brakes employed in vehicles are operated
    Show answer and explanation
    Answer: A —
    Mechanically
    Parking brakes in most vehicles are operated mechanically using cables and levers.
    Report a mistake
  71. 71.
    _________ is preferred to make MB plough shares as it can be forged
    Show answer and explanation
    Answer: C —
    High carbon steel
    High carbon steel is preferred for mouldboard plough shares because it can be forged, shaped, and heat-treated for edge retention.
    Report a mistake
  72. 72.
    When a plough works around a strip of ploughed land, the method of ploughing is
    Show answer and explanation
    Answer: A —
    Gathering
    Gathering is the method of ploughing where the plough works around a strip of ploughed land (ridge).
    Report a mistake
  73. 73.
    Which of the following factors affect the draft of a disc plough? (i) Speed of operation and soil moisture (ii) Diameter of disc and disc concavity (iii) Disc angle and tilt angle
    Show answer and explanation
    Answer: D —
    All of the above (i), (ii) and (iii)
    All listed factors—speed, soil moisture, disc dimensions, concavity, and angles—affect the draft of a disc plough.
    Report a mistake
  74. 74.
    A __________ is used for deep ploughing and breaking hard pan at depth of 50 cm or more.
    Show answer and explanation
    Answer: B —
    Sub soiler
    A subsoiler is designed for deep tillage to break up hardpans at depths of 50 cm or more.
    Report a mistake
  75. 75.
    Which of the following statement/(s) is true regarding a tractor operated rotovator? (i) Rotovator combines primary and secondary tillage in one operation (ii) Rotovator provides negative draft
    Show answer and explanation
    Answer: C —
    Both (i) and (ii)
    A rotovator performs primary and secondary tillage simultaneously, and because the rotating blades push the tractor forward, it exhibits negative draft.
    Report a mistake
  76. 76.
    The tilt angle of a vertical disc plough is
    Show answer and explanation
    Answer: C —
    0 degree
    In a vertical disc plough, the disc is set vertical, meaning the tilt angle is 0 degrees.
    Report a mistake
  77. 77.
    Which of the following affect the penetration of a disc harrow in the field? (i) Lowering hitch point (ii) Increasing gang angle (iii) Using smaller diameter discs with lesser concavity (iv) Decreasing gang angle
    Show answer and explanation
    Answer: A —
    (i), (ii) and (iii)
    Penetration of a disc harrow is increased by lowering the hitch point, increasing the gang angle, and using smaller discs with specific design parameters.
    Report a mistake
  78. 78.
    _______ is the flanged tube mounted on gang bolt between every two discs of the disc harrows to prevent their lateral movement
    Show answer and explanation
    Answer: B —
    Spool
    Spools (or spacer spools) are flanged tubes placed on the gang bolt between discs to maintain spacing and prevent lateral shifting.
    Report a mistake
  79. 79.
    The commonly made adjustments on cultivator shovels are
    Show answer and explanation
    Answer: D —
    All of the above
    Cultivator shovels can be adjusted for depth, row spacing, and orientation on tynes to control soil displacement.
    Report a mistake
  80. 80.
    Vertical suction of an MBP is
    Show answer and explanation
    Answer: A —
    3 to 5 mm
    Vertical suction (drop of the point of the share below the land side sole) in a mouldboard plough is typically 3 to 5 mm.
    Report a mistake
  81. 81.
    Chemical treatment using _________ removes the organic and physical materials that clog the emitters in a drip irrigation system
    Show answer and explanation
    Answer: B —
    Chlorine
    Chlorine treatment is commonly used to destroy biological growth and organic clogging agents in drip irrigation emitters.
    Report a mistake
  82. 82.
    Controlling an existing or potential high water table or artesian groundwater condition using shallow or deep tube wells or open wells is called __________ drainage
    Show answer and explanation
    Answer: C —
    Vertical
    Using wells to pump out groundwater and control the water table is known as vertical drainage.
    Report a mistake
  83. 83.
    Centrifugal pump is a type of __________ pump
    Show answer and explanation
    Answer: B —
    Rotodynamic
    A centrifugal pump belongs to the category of rotodynamic (or kinetic) pumps.
    Report a mistake
  84. 84.
    _________ starter is used in high rating 3 phase motors
    Show answer and explanation
    Answer: D —
    Star-Delta
    Star-Delta starters are commonly used to reduce starting current in high-rating three-phase induction motors.
    Report a mistake
  85. 85.
    Threshing can be accomplished by
    Show answer and explanation
    Answer: D —
    All of the above
    Threshing grain from crops is achieved through various mechanical actions including rubbing, impact, and stripping.
    Report a mistake
  86. 86.
    The ________ type forage harvesters use free swinging chains, hammers or knives to cut the crop
    Show answer and explanation
    Answer: A —
    Flail
    Flail-type forage harvesters utilize free-swinging knives, flails, or hammers to beat and cut forage crops.
    Report a mistake
  87. 87.
    Find the capacity of a field chopper with throat size 20 cm × 5 cm operating at 50 rpm. The cutter head has two knives with length of cut 3 cm. The bulk density of the material is 500 kg/m3 and the field efficiency of the chopper is 80%
    Show answer and explanation
    Answer: D —
    720 kg/h
    Capacity calculation yields 720 kg/h720 \text{ kg/h} considering throat dimensions, RPM, knife count, length of cut, bulk density, and 80% efficiency.
    Report a mistake
  88. 88.
    The free threshed grain carried over the rack in the straw and discharged from the combine harvester is called
    Show answer and explanation
    Answer: B —
    Rack loss
    Grain lost over the straw walkers or straw rack is specifically termed rack loss.
    Report a mistake
  89. 89.
    The lead adjustment provided to the outer end of the cutter bar, when the mower is not in operation is
    Show answer and explanation
    Answer: B —
    2 cm per meter of cutter bar
    The standard lead given to the outer end of a mower cutter bar is 2 cm per meter of cutter bar length.
    Report a mistake
  90. 90.
    The distance of throw of water from a sprinkler depends on (i) Operating pressure (ii) Size and shape of nozzle (iii) Angle of nozzle
    Show answer and explanation
    Answer: D —
    All of the above (i), (ii) and (iii)
    The throw distance of a sprinkler jet is affected by operating pressure, nozzle geometry, and nozzle angle.
    Report a mistake
  91. 91.
    ______ separator is used based on the difference in aerodynamic properties of various constituents of mixture
    Show answer and explanation
    Answer: C —
    Pneumatic separator
    Pneumatic separators utilize air streams to separate materials based on differences in their aerodynamic properties (weight, size, and shape).
    Report a mistake
  92. 92.
    ________ refers to the classification of cleaned products in to various quality fractions
    Show answer and explanation
    Answer: B —
    Grading
    Grading is the process of sorting cleaned agricultural produce into various quality or size fractions.
    Report a mistake
  93. 93.
    _________ is a machinery used for squeezing or pressing the material unit it breaks
    Show answer and explanation
    Answer: A —
    Crusher
    A crusher applies compressive force to squeeze and break down large pieces of material.
    Report a mistake
  94. 94.
    Hammer mill works under the force of
    Show answer and explanation
    Answer: D —
    Impact
    A hammer mill reduces material size primarily through high-speed impact forces.
    Report a mistake
  95. 95.
    ________ are used for lifting vertically between two pulleys to more than 50 m
    Show answer and explanation
    Answer: A —
    Bucket elevator
    Bucket elevators are ideal for vertical or near-vertical lifting of bulk materials across significant heights (over 50 m).
    Report a mistake
  96. 96.
    Modern facilities for storing the grains is
    Show answer and explanation
    Answer: B —
    Silo
    Silos are large, modern cylindrical structures used for bulk storage of grains.
    Report a mistake
  97. 97.
    EMC gives an idea about
    Show answer and explanation
    Answer: D —
    Whether the material will loose or gain the moisture at a particular set of atmospheric conditions
    Equilibrium Moisture Content (EMC) indicates whether a hygroscopic material will absorb or lose moisture in a given environment.
    Report a mistake
  98. 98.
    _________ method of drying is based on the sublimation of frozen moisture from wet product (i) Fluidized bed (ii) Spray drying (iii) Freeze drying (iv) Vacuum drying
    Show answer and explanation
    Answer: D —
    Only (iii)
    Freeze drying (lyophilization) is based on the direct sublimation of frozen moisture from the product under vacuum.
    Report a mistake
  99. 99.
    _______ is used for fumigating grain in tall sealed silos (i) Chlorine (ii) Phosphine (iii) Carbon dioxide
    Show answer and explanation
    Answer: B —
    Only (ii)
    Phosphine gas is widely used for fumigating stored grains in sealed silos to control insect pests.
    Report a mistake
  100. 100.
    Accuracy of the moisture content determination is obtained from (i) Direct method (ii) Indirect method (iii) Chemical method
    Show answer and explanation
    Answer: A —
    Only (i)
    Direct methods (such as oven-drying) provide the most accurate determination of moisture content in agricultural products.
    Report a mistake

Try the whole paper in one go

Answer all 100 questions first and see your score at the end.

Practise as a mock test →

How Kerala PSC marks objective papers

  • 1 mark for each right answer.
  • 1/3 mark is taken off for each wrong answer.
  • Questions you leave blank don’t lose marks.
  • Marks are counted with the final answer key, published after complaints on the provisional key.

Found a wrong answer or a typo on this page? Report it and we’ll check it against the official key.

This recruitment

Matched by post name.

More papers to practise

Papers for the same or similar posts.

All question papers

Not affiliated with the Kerala Public Service Commission. Questions and answers are copied from the official PDFs; always check the PDF.