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Maintenance Assistant (Mechanical) - Foam Mattings India Ltd question paper 2022

Date of test
19-08-2022
Question paper code
68/2022/OL
Category No.
332/2020
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.

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

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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.
    The weight of Engineer's hammer is varies from
    Show answer and explanation
    Answer: B —
    125 gm – 1500 gm
    Engineer's hammers generally vary in weight from 125 gm to 1500 gm depending on the type of work.
    Report a mistake
  2. 2.
    Bench vice is specified by
    Show answer and explanation
    Answer: D —
    Width of jaws
    A bench vice is specified by the width of its jaws.
    Report a mistake
  3. 3.
    Which vice is used for forging work ?
    Show answer and explanation
    Answer: B —
    Leg vice
    Leg vices are robust and designed to withstand heavy hammer blows during forging work.
    Report a mistake
  4. 4.
    What is the expansion of MKS System ?
    Show answer and explanation
    Answer: D —
    Metre, Kilogram and Second system
    MKS stands for Metre, Kilogram, and Second system of units.
    Report a mistake
  5. 5.
    How much is the accuracy of try square ?
    Show answer and explanation
    Answer: C —
    0.002 mm per 10 mm length
    The accuracy of a standard try square is 0.002 mm per 10 mm length.
    Report a mistake
  6. 6.
    Which type of rule is used in pattern making ?
    Show answer and explanation
    Answer: A —
    Shrink rule
    Shrink rules are used in pattern making to compensate for the shrinkage of molten metal upon cooling.
    Report a mistake
  7. 7.
    How many seconds are in one degree ?
    Show answer and explanation
    Answer: D —
    3600 seconds
    One degree contains 60 minutes, and each minute contains 60 seconds, so 60×60=360060 \times 60 = 3600 seconds.
    Report a mistake
  8. 8.
    The least count of steel rule is
    Show answer and explanation
    Answer: B —
    0.50 mm
    The standard least count of an ordinary steel rule is 0.5 mm.
    Report a mistake
  9. 9.
    The graduations are marked in Bevel protractor are
    Show answer and explanation
    Answer: B —
    0° – 180°
    The dial of a vernier bevel protractor is graduated from 0° to 180° on either side.
    Report a mistake
  10. 10.
    What is the unit of Temperature in British system ?
    Show answer and explanation
    Answer: A —
    Fahrenheit
    Fahrenheit is the standard temperature unit used in the British (FPS) system.
    Report a mistake
  11. 11.
    Which of the following surface plate retain their accuracy even if the surface is scratched ?
    Show answer and explanation
    Answer: C —
    Granite
    Granite surface plates do not form burrs when scratched, thereby retaining their accuracy.
    Report a mistake
  12. 12.
    Combination set consist of
    Show answer and explanation
    Answer: A —
    Square head, centre head, protractor head and rule
    A combination set consists of a square head, centre head, protractor head, and a steel rule.
    Report a mistake
  13. 13.
    Which marking media will give very clear lines but take more time for drying than other marking media ?
    Show answer and explanation
    Answer: D —
    Prussian blue
    Prussian blue provides very clear and sharp lines, but it takes more time to dry compared to other marking media.
    Report a mistake
  14. 14.
    What is the value of one Micron ?
    Show answer and explanation
    Answer: C —
    1/1000 mm
    One micron (μm\mu m) is equal to 10−610^{-6} meters, which is 1/10001/1000 mm.
    Report a mistake
  15. 15.
    How the Divider is specified ?
    Show answer and explanation
    Answer: C —
    Distance from the point to the centre of the fulcrum roller of the leg
    Dividers are specified by the effective length, i.e., distance from the point to the centre of the fulcrum roller.
    Report a mistake
  16. 16.
    Which of the following statement is/are correct about the use of Universal Surface gauge ?\nI. Scribing lines parallel to a curved edges\nII. Setting jobs on machine parallel to Datum surface\nIII. Check the height and parallelism of jobs\nIV. Mark the lines at any angle and mark parallel lines
    Show answer and explanation
    Answer: B —
    II and III
    A universal surface gauge is used for setting jobs on machines parallel to datum surfaces and checking height and parallelism.
    Report a mistake
  17. 17.
    Which grades of angle plates are used for very accurate tool room type work ?
    Show answer and explanation
    Answer: A —
    Grade I
    Grade I angle plates are machined more accurately and used for precision tool room work.
    Report a mistake
  18. 18.
    Which Caliper is used to find the centre of round rod ?
    Show answer and explanation
    Answer: C —
    Jenney Caliper
    Jenney calipers (also known as hermaphrodite or odd-leg calipers) are used for locating the centers of round bars.
    Report a mistake
  19. 19.
    Point angle of prick punch is
    Show answer and explanation
    Answer: A —
    30°
    The point angle of a prick punch is typically 30° and is used for witness marks.
    Report a mistake
  20. 20.
    Which material is used for making Scriber ?
    Show answer and explanation
    Answer: D —
    High carbon steel
    Scribers are made of high carbon steel to maintain a sharp, hardened point.
    Report a mistake
  21. 21.
    Ferrule is a
    Show answer and explanation
    Answer: C —
    Protective metal ring to prevent cracking of the handle
    The ferrule is a metal ring that reinforces the handle to prevent it from splitting when the tang is inserted.
    Report a mistake
  22. 22.
    The curved cut files are available only in a _______ shape.
    Show answer and explanation
    Answer: A —
    Flat
    Curved cut files are typically manufactured in a flat shape.
    Report a mistake
  23. 23.
    In 150 mm length of Bastard file, how may number of cuts over the length of 10 mm ?
    Show answer and explanation
    Answer: B —
    13
    A 150 mm Bastard file typically has 13 cuts per 10 mm.
    Report a mistake
  24. 24.
    Most files have the faces slightly bellied length wise. This is known as _______ of a file.
    Show answer and explanation
    Answer: B —
    Convexity
    The slight curvature along the length of a file is called convexity.
    Report a mistake
  25. 25.
    What is the pitch of hacksaw blade used to cut brass tubing, copper, iron pipe etc. ?
    Show answer and explanation
    Answer: D —
    1 mm
    A 1 mm pitch blade is generally recommended for cutting thin-walled pipes and tubing.
    Report a mistake
  26. 26.
    What is the name of angle marked x shown in figure given below ?
    Show answer and explanation
    Answer: B —
    Rake angle
    The angle between the face of the tool and the plane perpendicular to the base is the rake angle.
    Report a mistake
  27. 27.
    _______ is the distance a drill advances into the work in one complete rotation.
    Show answer and explanation
    Answer: C —
    Feed
    Feed is defined as the axial distance a drill moves into the workpiece per revolution.
    Report a mistake
  28. 28.
    What is the taper angle of second tap shown in figure given below ?
    Show answer and explanation
    Answer: C —
    10°
    The second tap (intermediate tap) typically has a taper angle of 10∘10^{\circ}.
    Report a mistake
  29. 29.
    _______ is an operation of bevelling the end of a drilled hole.
    Show answer and explanation
    Answer: C —
    Countersinking
    Countersinking is the process of creating a conical bevel at the opening of a hole.
    Report a mistake
  30. 30.
    Which gauge is used to check the radius formed on the edges of an components ?
    Show answer and explanation
    Answer: D —
    Radius gauge
    Radius gauges are specifically designed to check internal and external radii.
    Report a mistake
  31. 31.
    In metric micrometer the pitch of the spindle thread is _______
    Show answer and explanation
    Answer: C —
    0.5 mm
    The pitch of the spindle screw thread in a standard metric micrometer is 0.5 mm.
    Report a mistake
  32. 32.
    The micrometer works on the principle of _______
    Show answer and explanation
    Answer: B —
    Screw and nut
    A micrometer operates on the screw and nut principle.
    Report a mistake
  33. 33.
    In a Dial Caliper, the Dial hand is operated by ______ system on the beam.
    Show answer and explanation
    Answer: C —
    Rack and pinion
    In a dial caliper, linear motion of the slider is converted to rotational motion of the dial hand via a rack and pinion mechanism.
    Report a mistake
  34. 34.
    In vernier height gauge ______ is used on the movable jaw, when it is required to take measurement from the lower place.
    Show answer and explanation
    Answer: C —
    Off set scriber
    An offset scriber is used in vernier height gauges to enable measurements and markings down to the base level.
    Report a mistake
  35. 35.
    What is the least count of vernier bevel protractor ?
    Show answer and explanation
    Answer: B —
    2 MSD – 1 VSD
    The least count of a vernier bevel protractor is calculated as 2 MSD – 1 VSD = 5 minutes.
    Report a mistake
  36. 36.
    Which grade slip gauge is used for precision tool room applications ?
    Show answer and explanation
    Answer: A —
    Grade I
    Grade I slip gauges are used for precision tool room applications.
    Report a mistake
  37. 37.
    What is the purpose of holes drilled across sine bar ?
    Show answer and explanation
    Answer: C —
    For reducing the weight and also it facilitate clamping of sine bar on angle plate
    Holes are drilled in sine bars to reduce their weight and provide clamping options on angle plates.
    Report a mistake
  38. 38.
    What is the name of Jig shown in figure given below ?
    Show answer and explanation
    Answer: B —
    Drill Jig
    The device illustrated functions as a drill jig.
    Report a mistake
  39. 39.
    The ability to select components for assembly at random and fit them together within proper tolerance is called ______
    Show answer and explanation
    Answer: C —
    Interchangeability
    Interchangeability refers to the ability to assemble randomly selected matching parts within specified tolerances.
    Report a mistake
  40. 40.
    _______ is the difference between the maximum limit of size and the minimum limit of size.
    Show answer and explanation
    Answer: B —
    Tolerance
    Tolerance is defined as the difference between the maximum and minimum limits of size.
    Report a mistake
  41. 41.
    The included angle of BA thread is
    Show answer and explanation
    Answer: D —
    4712°47\frac{1}{2}°
    The British Association (BA) thread has an included angle of 47.5° (4712°47\frac{1}{2}°).
    Report a mistake
  42. 42.
    What is the name of coupling show in figure given below ?
    Show answer and explanation
    Answer: B —
    Flange coupling
    The coupling shown is a flange coupling.
    Report a mistake
  43. 43.
    If two bevel gears are symmetrical to each other and transmit motion at right angle such gears may be called
    Show answer and explanation
    Answer: C —
    Mitre gear
    Mitre gears are equal bevel gears connecting shafts at right angles with a 1:1 gear ratio.
    Report a mistake
  44. 44.
    The belt turns on a pulley it tends to stretch on the contact area of the driving pulley and shorten on the driven pulley. This localized movement of the belt is a direct result of elastic stretch and is known as
    Show answer and explanation
    Answer: A —
    Creep
    Creep is the local relative motion of the belt over the pulley surface due to varying tension (elastic stretch and contraction).
    Report a mistake
  45. 45.
    Which belt is generally used, when the distance between the shaft is too short ?
    Show answer and explanation
    Answer: A —
    V belt
    V-belts are typically used for short center distances between shafts.
    Report a mistake
  46. 46.
    What is the name of bearing used, when the loading is parallel to the bearing axis ?
    Show answer and explanation
    Answer: A —
    Thrust bearing
    Thrust bearings are designed to handle loads parallel to the axis of rotation.
    Report a mistake
  47. 47.
    Which key is used for transmitting light torque ?
    Show answer and explanation
    Answer: B —
    Woodruff key
    Woodruff keys are generally used for transmitting light to medium torques on tapered or straight shafts.
    Report a mistake
  48. 48.
    What is the name of clutch shown in figure given below ?
    Show answer and explanation
    Answer: C —
    Cone clutch
    The clutch shown with matching conical friction surfaces is a cone clutch.
    Report a mistake
  49. 49.
    In which tooth type lock washers are used, when the mounting holes are over size ?
    Show answer and explanation
    Answer: B —
    Internal and external type
    Internal-external type tooth lock washers are used when mounting holes are oversized or extra grip area is needed.
    Report a mistake
  50. 50.
    Which alloy is used to make the bearing for work at higher temperature and have higher load carrying capacity ?
    Show answer and explanation
    Answer: C —
    Cadmium based alloy
    Cadmium-based bearing alloys retain high strength and load capacity at elevated operating temperatures.
    Report a mistake
  51. 51.
    The process which helps in producing a fine grain for uniformity of structure and for improved mechanical properties is known as
    Show answer and explanation
    Answer: D —
    Normalizing
    Normalizing refines grain structure, removes internal stresses, and improves mechanical properties.
    Report a mistake
  52. 52.
    Which one of the following is an alloy of carbon and iron in which carbon in combined state ?
    Show answer and explanation
    Answer: A —
    Steel
    Steel is an alloy of iron and carbon where carbon is primarily in a chemically combined state (as cementite/pearlite).
    Report a mistake
  53. 53.
    Carbon dissolved in the iron to form a solid solution is called
    Show answer and explanation
    Answer: B —
    Ferrite
    Ferrite is an interstitial solid solution of carbon dissolved in alpha-iron.
    Report a mistake
  54. 54.
    If the hot steel is the cooled rapidly the austenite changed in to a new structure called Martensite which property of steel is increase
    Show answer and explanation
    Answer: A —
    Hardness
    Rapid cooling (quenching) of austenite transforms it into martensite, which significantly increases the hardness of steel.
    Report a mistake
  55. 55.
    Which cast iron has the ability to reduce vibration and tool chattering in machine tools ?
    Show answer and explanation
    Answer: A —
    Grey cast iron
    Grey cast iron has excellent damping capacity, making it ideal for machine tool beds to absorb vibrations.
    Report a mistake
  56. 56.
    What is the name of heat treatment process for reheating the hardened steel to a temperature below 400 degree centigrade followed by cooling ?
    Show answer and explanation
    Answer: C —
    Tempering
    Tempering involves reheating hardened steel below the lower critical temperature (often below 400°C) to relieve brittleness.
    Report a mistake
  57. 57.
    Why tempering process is carried out in
    Show answer and explanation
    Answer: D —
    To regulate the hardness and toughness
    Tempering is performed to reduce excessive hardness and brittleness while increasing toughness and ductility.
    Report a mistake
  58. 58.
    What is the purpose of brine solution, water, oil and air used in heat treatment process ?
    Show answer and explanation
    Answer: B —
    Quenching
    Brine, water, oil, and air are quenching media used for rapid cooling in heat treatment.
    Report a mistake
  59. 59.
    Name the property of metal that withstand shock or impact
    Show answer and explanation
    Answer: A —
    Tenacity
    Tenacity is the property of a material to withstand tensile load/shock or impact without fracture.
    Report a mistake
  60. 60.
    Which metal is used for magnets and ball bearing ?
    Show answer and explanation
    Answer: A —
    Cobalt
    Cobalt is widely used in high-strength steels, permanent magnets, and ball bearing alloys.
    Report a mistake
  61. 61.
    Which one of the following is the function of tuyers in the forge ?
    Show answer and explanation
    Answer: C —
    Act as outlet of products of combustion
    Tuyeres or smoke hoods/outlets in certain contexts manage exhaust gases, though primarily in blast furnaces they supply air; based on the answer key option-C is designated.
    Report a mistake
  62. 62.
    Which among the following is a term used in forging in which the thickness of the job is increased by decreasing the length ?
    Show answer and explanation
    Answer: D —
    Jumping
    Jumping (or upsetting) is a forging operation where length is decreased to increase cross-sectional thickness.
    Report a mistake
  63. 63.
    Forging is done when the metal is in
    Show answer and explanation
    Answer: B —
    Plastic condition
    Hot forging is performed when the metal is heated to its plastic state.
    Report a mistake
  64. 64.
    Which one of the following operations are performed when bottom swage and top fuller used together ?
    Show answer and explanation
    Answer: A —
    Hollowing
    Using a bottom swage and top fuller together helps in hollowing or grooving operations.
    Report a mistake
  65. 65.
    Cast iron cannot be foged because it has the property of
    Show answer and explanation
    Answer: D —
    Brittleness
    Cast iron is brittle and lacks plasticity, making it unsuitable for forging.
    Report a mistake
  66. 66.
    Which among the following is a forging defect which occurs during upsetting process when faces of the stock become square ?
    Show answer and explanation
    Answer: A —
    Buckling of stock
    Buckling of stock occurs during upsetting if the stock length-to-diameter ratio is too high.
    Report a mistake
  67. 67.
    Which one of the following is used for bending hooks of flat and round steel bars ?
    Show answer and explanation
    Answer: C —
    Bolster swages
    Bolster and swages/forming blocks are used for bending hooks and eyes in bars.
    Report a mistake
  68. 68.
    The instrument used to measure high temperature in furnace is
    Show answer and explanation
    Answer: D —
    Pyrometer
    Pyrometers are used to measure extremely high temperatures, such as those in furnaces.
    Report a mistake
  69. 69.
    Fullers are used for
    Show answer and explanation
    Answer: A —
    Necking and grooving
    Fullers are blacksmith tools used for necking, grooving, and drawing down metal.
    Report a mistake
  70. 70.
    The process of local thinning down of a stock by forging operation is called as
    Show answer and explanation
    Answer: A —
    Setting down
    Setting down is used for local reduction or thinning of stock in forging.
    Report a mistake
  71. 71.
    Which tool used for closing down the edges of plate and head of rivet ?
    Show answer and explanation
    Answer: B —
    Caulking tool
    A caulking tool is used to flatten and close the edges of plates and rivet heads to make joints leak-proof.
    Report a mistake
  72. 72.
    Which hammer is used for preparing for wire edge on sheet metal work ?
    Show answer and explanation
    Answer: C —
    Creasing hammer
    Creasing hammer is used in sheet metal work for forming wire edges and creases.
    Report a mistake
  73. 73.
    Which stake is useful for making sharp bends, folding edges of sheet metal ?
    Show answer and explanation
    Answer: B —
    Hatchet stake
    Hatchet stake is used for bending, folding edges, and making sharp 90° bends in sheet metal.
    Report a mistake
  74. 74.
    Pittsburgh seam is also known as
    Show answer and explanation
    Answer: B —
    Hammer lock
    The Pittsburgh lock seam is also commonly referred to as a hammer lock seam.
    Report a mistake
  75. 75.
    Allowance for paned down joints is
    Show answer and explanation
    Answer: D —
    2W + 2T
    The standard sheet metal allowance for paned down joints is 2W+2T2W + 2T.
    Report a mistake
  76. 76.
    What is the angle of counter sinking for riveting ?
    Show answer and explanation
    Answer: A —
    75°
    Countersinking angle for flush riveting is typically 75°.
    Report a mistake
  77. 77.
    The distance from the edge of the plate to the center of the nearest rivet (diameter of rivet is d) is
    Show answer and explanation
    Answer: C —
    1.5d
    Edge distance (margin) for riveted joints is generally maintained at 1.5d1.5d.
    Report a mistake
  78. 78.
    Which a statement is/are correct about hand lever punch ?\ni. For marking holes when too much holes are to be punched\nii. For punching small holes in thin metal sheet\niii. The tool consists of a punch and die\niv. To mark the center of holes to be drilled
    Show answer and explanation
    Answer: A —
    Only i and iii
    A hand lever punch consists of a punch and die, and is used for punching multiple holes in sheet metal.
    Report a mistake
  79. 79.
    Which method of pattern layout is used for prisms or cylinders ?
    Show answer and explanation
    Answer: C —
    Parallel line
    Parallel line development method is used for pattern layout of prisms and cylinders.
    Report a mistake
  80. 80.
    Choose the correct matching sequence of the following\n1. Single seam a. Used to join the bottom of a container to its body\n2. Double seam b. Used to join a bottom to vertical bodies of various shapes\n3. Dovetail seam c. Formed edge is bent upward against the body\n4. Flanged seam d. Used to join flat plate to a cylindrical piece
    Show answer and explanation
    Answer: D —
    1-b, 2-c, 3-d, 4-a
    Matching sheet metal seams with their appropriate applications yields 1-b, 2-c, 3-d, 4-a.
    Report a mistake
  81. 81.
    Which type shade number of filter colour glass is used for manual arc welding up to 100 amperes ?
    Show answer and explanation
    Answer: C —
    8 – 9
    Filter shade numbers 8 to 9 are used for manual arc welding up to 100 amperes.
    Report a mistake
  82. 82.
    What is the point where the weld face joints the parent metal ?
    Show answer and explanation
    Answer: B —
    Toe of weld
    The toe of the weld is the junction between the weld face and the parent metal.
    Report a mistake
  83. 83.
    What is the range of coating factor for medium coated electrodes ?
    Show answer and explanation
    Answer: C —
    1.40 to 1.50
    The coating factor for medium coated electrodes ranges from 1.40 to 1.50.
    Report a mistake
  84. 84.
    What are the substances used to make the welds stronger ?
    Show answer and explanation
    Answer: A —
    Deoxidizers
    Deoxidizers remove oxygen and oxides, improving the soundness and strength of the weld metal.
    Report a mistake
  85. 85.
    Which size cutting nozzle is used for gas cutting 19 – 100 mm thickness plate ?
    Show answer and explanation
    Answer: D —
    1.6 mm
    A 1.6 mm orifice size cutting nozzle is typically used for gas cutting steel plates of thickness 19 mm to 100 mm.
    Report a mistake
  86. 86.
    Which statement is/are correct about mild steel electrode ?\ni. It contain silicon above 0.5%\nii. It contain carbon 0.1 to 0.3%\niii. During welding the electrode will tend to get red got quickly
    Show answer and explanation
    Answer: B —
    Only i and ii
    Mild steel electrodes generally contain carbon around 0.1 to 0.3% and silicon above 0.5% (or as specified in standard classifications).
    Report a mistake
  87. 87.
    The percentage of carbon and hydrogen in acetylene gas is
    Show answer and explanation
    Answer: B —
    Carbon 92.3% and Hydrogen 7.7%
    Acetylene (C2H2C_2H_2) consists of approximately 92.3% carbon and 7.7% hydrogen by weight.
    Report a mistake
  88. 88.
    Which statement is correct about the rightward welding techniques ?\ni. The rightward technique is used to welding steel having thickness above 5 mm\nii. The rightward technique is used to welding steel having thickness up to 5 mm\niii. There is more heat concentration for fusion, and hence useful for welding thick jobs\niv. There is less heat concentration for fusion, and hence useful for welding thin jobs
    Show answer and explanation
    Answer: C —
    Only i and iii
    Rightward (backhand) welding provides greater heat concentration and is suitable for steel plates thicker than 5 mm.
    Report a mistake
  89. 89.
    In thermit welding, thermit is a mixture of
    Show answer and explanation
    Answer: A —
    Iron oxide and Aluminium
    Thermit is a pyrotechnic mixture of metal oxide (usually iron oxide) and aluminium powder.
    Report a mistake
  90. 90.
    The straight line which bisecting two toe points is known as
    Show answer and explanation
    Answer: D —
    Miter line
    The miter line bisects the angle formed at the toes of a fillet weld.
    Report a mistake
  91. 91.
    The connection between the lead screw and carriage is made by
    Show answer and explanation
    Answer: D —
    Split nut
    The split nut (half nut) engages the carriage with the lead screw for thread cutting on a lathe.
    Report a mistake
  92. 92.
    The micrometers dial on the cross slide hand wheel, with the accuracy of
    Show answer and explanation
    Answer: B —
    0.05 mm
    The micrometer dial on a lathe cross slide typically provides an accuracy/least count of 0.05 mm.
    Report a mistake
  93. 93.
    In lathe, which gear mechanism is used for changing the direction of rotation of the lead screw and feed shaft ?
    Show answer and explanation
    Answer: D —
    Tumbler gear
    Tumbler gears are used in the lathe headstock to reverse the direction of rotation of the lead screw and feed shaft.
    Report a mistake
  94. 94.
    Which statement is/are correct about compound rest method ?\ni. Both hand feed and power feed can be given\nii. Steep tapers can be produced\niii. Threads on the taper portion can not be produced\niv. Both internal and external tapers can be produced
    Show answer and explanation
    Answer: C —
    Only ii and iv
    The compound rest method allows cutting of steep tapers and both internal and external tapers manually.
    Report a mistake
  95. 95.
    Which center is used to support the end of the job where no countersink hole is permitted ?
    Show answer and explanation
    Answer: C —
    Female center
    A female (cup) center is used when the workpiece has a pointed end and no countersink center hole can be drilled into it.
    Report a mistake
  96. 96.
    What is the formula used to find taper angle by tail stock offset method ?
    Show answer and explanation
    Answer: A —
    Set-over = (D-d)L/2I
    The tailstock set-over formula is Set-over=(D−d)×L2l\text{Set-over} = \frac{(D-d) \times L}{2l}, where LL is total length and ll is tapered length.
    Report a mistake
  97. 97.
    Which one of the following standard taper is provided in the tailstock barrel ?
    Show answer and explanation
    Answer: B —
    Morse taper
    Standard Morse tapers are provided in lathe tailstock barrels.
    Report a mistake
  98. 98.
    Which statement is/are correct about four jaw chuck ?\ni. Separate internal and external jaws are available\nii. Each jaws has square thread provided\niii. There is no loss of accuracy as the chuck gets worn out\niv. Jaws move upward or downward, depending up on the rotation of crown wheel
    Show answer and explanation
    Answer: C —
    Only ii and iii
    In a four-jaw independent chuck, each jaw has a square thread/screw mechanism, and wear does not affect concentric accuracy since jaws are adjusted individually.
    Report a mistake
  99. 99.
    Which work holding device are serve as a fixture ?
    Show answer and explanation
    Answer: C —
    Face plate
    A face plate acts as a work-holding device that can serve as a fixture for mounting irregular workpieces.
    Report a mistake
  100. 100.
    Function of clearance angle in a lathe cutting tool is
    Show answer and explanation
    Answer: D —
    Avoid rubbing of tool with the work
    The primary function of the clearance angle is to prevent the flank of the tool from rubbing against the machined surface of the workpiece.
    Report a mistake

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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.

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