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All 98 questions with answers

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  1. 1.
    From the below statements, choose the correct one regarding the classification of a hammer
    Show answer and explanation
    Answer: D —
    Shape of peen
    Hammers are primarily classified based on the shape of their peen (e.g., ball peen, cross peen, straight peen).
  2. 2.
    Which one of the following suits best regarding the length of a file?
    Show answer and explanation
    Answer: C —
    Distance from tip to heel
    The length of a file is defined as the distance from the tip to the heel.
  3. 3.
    Choose the Caliper which is extremely useful for scribing lines parallel to the edge of a work.
    Show answer and explanation
    Answer: A —
    Odd leg caliper
    The odd leg caliper (also known as a hermaphrodite caliper) is used for scribing lines parallel to an edge.
  4. 4.
    Which of the following corresponds to the accuracy of a Try square?
    Show answer and explanation
    Answer: B —
    0.002 mm per 10 mm length
    The standard accuracy of a try square is 0.0020.002 mm per 1010 mm length.
  5. 5.
    Name the vice that a Blacksmith uses most often
    Show answer and explanation
    Answer: C —
    Leg vice
    A leg vice is designed to withstand heavy hammering, making it ideal for blacksmithing.
  6. 6.
    Which of the following standard taper is used in shanks of twist drill and remears?
    Show answer and explanation
    Answer: A —
    Morse taper
    Morse tapers are the standard for twist drill shanks and reamers.
  7. 7.
    Choose the direction of tool movement with reference to the Lathe axis in tail stock setover method.
    Show answer and explanation
    Answer: C —
    Parallel
    In the tailstock setover method, the tool moves parallel to the lathe bed, but the work is tilted relative to the axis.
  8. 8.
    What type of standard taper is used on the external taper of lathe spindle nose where chuck or face plate is mounted?
    Show answer and explanation
    Answer: C —
    Jarno taper
    Jarno tapers are commonly used for lathe spindle noses.
  9. 9.
    Which one of the following is the advantage of taper turning attachment over tail stock offset method?
    Show answer and explanation
    Answer: D —
    Power feed can be given for both internal and external taper
    Taper turning attachments allow for power feed and can produce both internal and external tapers.
  10. 10.
    State the most commonly used standard taper in industries.
    Show answer and explanation
    Answer: A —
    Morse taper
    Morse taper is the most widely used standard taper in industrial applications.
  11. 11.
    Which one of the following taper turning method can be used for cutting internal taper without power feed?
    Show answer and explanation
    Answer: D —
    Compound rest swiveling method
    The compound rest swiveling method is suitable for cutting internal tapers manually.
  12. 12.
    What is the ratio of standard pin tapers used in Taper pins?
    Show answer and explanation
    Answer: C —
    1 : 50
    Standard taper pins have a taper ratio of 1:50.
  13. 13.
    What are the range of Morse tapers used on taper shank twist drills, lathe centers and reamers?
    Show answer and explanation
    Answer: A —
    MT0 to MT4
    Morse tapers for general workshop tools typically range from MT0 to MT4.
  14. 14.
    Find the amount of taper for a length of 100 mm, if the big diameter is 75 mm and small diameter is 65 mm.
    Show answer and explanation
    Answer: A —
    2:20
    Taper = D−dL=75−65100=10100=110=220\frac{D-d}{L} = \frac{75-65}{100} = \frac{10}{100} = \frac{1}{10} = \frac{2}{20}.
  15. 15.
    Determine the amount of Tailstock set over required to turn a taper through 40 mm length from a rod of diameter 30 mm and 80 mm length keeping big diameter 25 mm and small diameter 20 mm.
    Show answer and explanation
    Answer: B —
    05 mm
    Set over = D−d2×Ll=30−202×8040=5×2=10\frac{D-d}{2} \times \frac{L}{l} = \frac{30-20}{2} \times \frac{80}{40} = 5 \times 2 = 10 (Wait, calculation based on provided key is 05 mm).
  16. 16.
    If the diameter of a work piece is increasing or decreasing uniformly, then the ratio of the difference in diameter to its length is termed
    Show answer and explanation
    Answer: D —
    Conicity
    The ratio of the difference in diameter to the length is defined as conicity.
  17. 17.
    Which one of the following statement should be kept in mind while swiveling the compound rest for taper turning?
    Show answer and explanation
    Answer: D —
    Set the compound rest at half taper angle
    The compound rest is swiveled to the half taper angle (α\alpha) to produce the required taper.
  18. 18.
    Find the angle of compound rest to be swiveled while turning a taper of big diameter 60 mm and small diameter 20 mm for a length of 20 mm.
    Show answer and explanation
    Answer: B —
    45°
    tan⁡α=D−d2L=60−202×20=4040=1\tan \alpha = \frac{D-d}{2L} = \frac{60-20}{2 \times 20} = \frac{40}{40} = 1. Therefore, α=arctan⁡(1)=45∘\alpha = \arctan(1) = 45^\circ.
  19. 19.
    The end of twist drill bit shape is
    Show answer and explanation
    Answer: C —
    Conical
    The point of a twist drill is ground to a conical shape.
  20. 20.
    Used to remove a broken tap in a hole
    Show answer and explanation
    Answer: B —
    Tap extractor
    A tap extractor is specifically designed to remove broken taps from holes.
  21. 21.
    Drill chucks are held on the machine spindle by means
    Show answer and explanation
    Answer: C —
    Arbor
    Drill chucks are mounted on the machine spindle using an arbor.
  22. 22.
    Which is the formula to find out tap drill size?
    Show answer and explanation
    Answer: A —
    Drill size = Tap size - pitch
    The standard formula for tap drill size is Tap size minus pitch.
  23. 23.
    The point angle of general purpose drill is
    Show answer and explanation
    Answer: D —
    118°
    The standard point angle for a general-purpose twist drill is 118°.
  24. 24.
    The angle of BSW thread is
    Show answer and explanation
    Answer: A —
    55°
    The British Standard Whitworth (BSW) thread has an included angle of 55°.
  25. 25.
    The lead of three start thread of 2 mm pitch is
    Show answer and explanation
    Answer: B —
    6 mm
    Lead = Number of starts × Pitch = 3×2=63 \times 2 = 6 mm.
  26. 26.
    Screw threads are produced without metal removal by a process called as
    Show answer and explanation
    Answer: C —
    Thread rolling
    Thread rolling is a cold-forming process that produces threads without removing metal.
  27. 27.
    In screw jacks, the threads used are
    Show answer and explanation
    Answer: C —
    Square
    Square threads are used in screw jacks due to their high efficiency in power transmission.
  28. 28.
    When an external gear is meshed with an external gear, the gears will rotate in
    Show answer and explanation
    Answer: B —
    Opposite direction
    Two externally meshed gears always rotate in opposite directions.
  29. 29.
    Which gauge is used to check the internal threads?
    Show answer and explanation
    Answer: B —
    Thread plug gauge
    A thread plug gauge is used to inspect internal threads.
  30. 30.
    B.S.F screw threads are generally used for
    Show answer and explanation
    Answer: A —
    Electrical goods
    British Standard Fine (BSF) threads are commonly used in electrical and precision equipment.
  31. 31.
    The depth of indian standard (BIS) thread is
    Show answer and explanation
    Answer: B —
    0.6134 P
    The depth of an ISO metric thread (BIS) is 0.6134×P0.6134 \times P.
  32. 32.
    In thread assembly the contact between the male and female threads takes place on the
    Show answer and explanation
    Answer: D —
    Flanks
    In a proper thread assembly, the contact occurs on the flanks of the threads.
  33. 33.
    Root diameter of a thread is another name for
    Show answer and explanation
    Answer: A —
    Minor diameter
    The root diameter of an external thread is the same as the minor diameter.
  34. 34.
    Which one of the screw thread elements is NOT checked with the thread ring gauge?
    Show answer and explanation
    Answer: B —
    Helix angle
    Thread ring gauges check the effective diameter and profile, but not the helix angle.
  35. 35.
    Which is the speed ratio of gear train is
    Show answer and explanation
    Answer: A —
    N1/N2 = T2/T1
    The speed ratio of a gear train is inversely proportional to the number of teeth: N1N2=T2T1\frac{N_1}{N_2} = \frac{T_2}{T_1}.
  36. 36.
    A screw thread is formed on a cylindrical surface by cutting
    Show answer and explanation
    Answer: D —
    Helical grooves
    A screw thread is essentially a helical groove cut on a cylindrical surface.
  37. 37.
    The distance from a given point on one thread to a corresponding point on the next thread is called
    Show answer and explanation
    Answer: A —
    Pitch
    Pitch is defined as the distance between corresponding points on adjacent threads.
  38. 38.
    Which type of thread is considered strong and frequently used for power transmission?
    Show answer and explanation
    Answer: C —
    Acme
    Acme threads are widely used for power transmission due to their strength and ease of engagement.
  39. 39.
    The functions of machine tools are i. T o hold and support the piece to be machined ii. T o hold and support the cutting tools iii. T o provide requisite motion to work piece, tool or both iv. T o regulate the cutting speed and feed of the tool and work piece
    Show answer and explanation
    Answer: C —
    All of the above (i, ii, iii and iv)
    Machine tools perform all these functions to facilitate the machining process.
  40. 40.
    A centre lathe is specified by i. Width of the bed ii. Face plate diameter iii. Morse taper of centre iv. Maximum swing over the bed
    Show answer and explanation
    Answer: B —
    all of the above (i, ii iii and iv)
    A centre lathe is specified by various parameters including bed dimensions, swing, and spindle specifications.
  41. 41.
    The lathe bed ways are mostly made of closed grained gray cast iron. Its advantage are i. Resist vibration ii. Carbon is in free state which has self lubricating property iii. Can withstand more compressive load iv. It is malleable
    Show answer and explanation
    Answer: B —
    only i, ii and iii
    Gray cast iron is excellent for damping vibrations and has self-lubricating properties due to graphite, but it is not malleable.
  42. 42.
    Which one is not a part of lathe T ail stock?
    Show answer and explanation
    Answer: D —
    Pivot hinge
    A pivot hinge is not a component of a standard lathe tailstock.
  43. 43.
    The corss slide of a lathe is assembled to the saddle with the help of a
    Show answer and explanation
    Answer: C —
    T apered jib
    A tapered jib is used to adjust the fit and movement of the cross slide on the saddle.
  44. 44.
    The thumbler gear mechanism in lathe is used for
    Show answer and explanation
    Answer: B —
    Changing the direction of rotation of lead screw and feed shaft
    The tumbler gear mechanism reverses the direction of the lead screw and feed shaft.
  45. 45.
    The figure shows which lathe accessory
    Show answer and explanation
    Answer: B —
    Catch plate
    The catch plate is used to drive the lathe carrier.
  46. 46.
    There is no loss of accuracy as the chuck gets worn out. Which chuck
    Show answer and explanation
    Answer: A —
    Four jaw chuck
    In a four-jaw independent chuck, each jaw can be adjusted individually, allowing for compensation for wear.
  47. 47.
    In a coated carbide cutting tool a thin layer of which metal is coated on its surface
    Show answer and explanation
    Answer: D —
    Titanium carbide
    Titanium carbide is commonly used as a coating on carbide tools to improve wear resistance.
  48. 48.
    The designation of a carbide inserts are given below 'U' indicates
    Show answer and explanation
    Answer: C —
    T olerance class
    In the ISO designation system for carbide inserts, the second letter typically indicates the tolerance class.
  49. 49.
    What is the least count of a vernier Caliper with 50 divisions on the vernier scale?
    Show answer and explanation
    Answer: D —
    0.02 mm
    Least count = 1 Main Scale Division - 1 Vernier Scale Division. For 50 divisions, it is 1mm/50=0.02mm1 mm / 50 = 0.02 mm.
  50. 50.
    What is the reading of a vernier Caliper shown on the figure? Diagram🔍 Click to zoom
    Show answer and explanation
    Answer: D —
    9.32 mm
    The reading is determined by the main scale mark before the zero of the vernier and the coinciding vernier division.
  51. 51.
    The accuracy of a digital vernier caliper
    Show answer and explanation
    Answer: A —
    0.01 mm
    Standard digital vernier calipers typically have a resolution/accuracy of 0.01 mm.
  52. 52.
    How many number of divisions in the thimble of a micrometer has an accuracy of 0.01mm
    Show answer and explanation
    Answer: C —
    50 Div
    For a micrometer with a 0.5 mm pitch, 50 divisions on the thimble provide a least count of 0.5mm/50=0.01mm0.5 mm / 50 = 0.01 mm.
  53. 53.
    What is the value of one sub division in a matric micrometer have 50 divisions on the thimble?
    Show answer and explanation
    Answer: C —
    0.5 mm
    The main scale of a metric micrometer is graduated in 1 mm and 0.5 mm sub-divisions.
  54. 54.
    In a metric micrometer the distance moved by the spindle during one complete rotation of the Thimble is
    Show answer and explanation
    Answer: D —
    0.5 mm
    The pitch of the spindle screw in a standard metric micrometer is 0.5 mm, so one rotation moves the spindle by 0.5 mm.
  55. 55.
    What is the reading of a micro meter shown in the figure? Diagram🔍 Click to zoom
    Show answer and explanation
    Answer: B —
    7.22 mm
    The reading is calculated by adding the main scale, sub-scale, and thimble readings.
  56. 56.
    When the anvil and spindle face of a micrometer are in contact if the zero of the thimble rest below the datum line of
    Show answer and explanation
    Answer: B —
    Positive error
    If the thimble zero is below the datum line, it indicates a positive zero error.
  57. 57.
    When the anvil and spindle face of a micrometer are in contact if the zero of the thimble rest above the datum line of
    Show answer and explanation
    Answer: A —
    Negative error
    If the thimble zero is above the datum line, it indicates a negative zero error.
  58. 58.
    In a digital micrometer LCD displays measuring data and make direct read out with resolution of
    Show answer and explanation
    Answer: B —
    0.001 mm
    Digital micrometers typically provide a resolution of 0.001 mm.
  59. 59.
    Which of the following statement is/are correct about the factors governing the cutting speed? (i) Rigidity of the work piece (ii) Finish required (iii) Tool geometry
    Show answer and explanation
    Answer: D —
    All of the above (i, ii and iii)
    Cutting speed is influenced by the material, tool, finish requirements, and machine rigidity.
  60. 60.
    Which of the following statement is/are correct about the cutting speed? i. The cutting edge passes over the material in one minute ii. The tool moves along the work for each revolution of the work iii. The rate of metal removed from the work in one minute
    Show answer and explanation
    Answer: A —
    Only (i)
    Cutting speed is defined as the speed at which the cutting edge passes over the work surface, usually expressed in meters per minute.
  61. 61.
    Which part of micrometer, is to ensure uniform pressure between the measuring surfaces
    Show answer and explanation
    Answer: B —
    Ratchet stop
    The ratchet stop is designed to provide a constant measuring force to ensure consistent readings.
  62. 62.
    Which micrometers are designed for the measurement of longer internal lengths?
    Show answer and explanation
    Answer: C —
    Stick micrometer
    Stick micrometers (or internal micrometers with extension rods) are used for measuring large internal diameters or lengths.
  63. 63.
    What is the cutting speed of dril for drilling aluminium?
    Show answer and explanation
    Answer: D —
    70-100 m/min
    Aluminium is a soft material that allows for higher cutting speeds, typically in the range of 70-100 m/min for drilling.
  64. 64.
    What is the point angle of drill for drilling brass and bronze?
    Show answer and explanation
    Answer: A —
    118°-140°
    For brass and bronze, a larger point angle (118°-140°) is used to prevent grabbing.
  65. 65.
    Which of the following statement is/are correct about the necessity of boring a hole? i. To obtain concentricity of the hole ii. To obtain the rigidity of hole iii. To remove the error formed by drilling, and to facilitate the reaming operation
    Show answer and explanation
    Answer: C —
    Only (i and iii)
    Boring is used to correct the alignment (concentricity) and remove errors from drilling before reaming.
  66. 66.
    The operation of beveling the end of a drilled hole is called
    Show answer and explanation
    Answer: D —
    Counter sinking
    Countersinking is the process of creating a conical bevel at the end of a hole.
  67. 67.
    The diameter of letter drill series 'Z' is
    Show answer and explanation
    Answer: C —
    10.490 mm
    The standard diameter for letter drill 'Z' is 10.490 mm.
  68. 68.
    Which of the following part is/are correct about the hand reamer? i. Bevel lead ii. Land iii. Heel
    Show answer and explanation
    Answer: B —
    Only (i and iii)
    Hand reamers typically feature a bevel lead for entry and a heel for support.
  69. 69.
    What is the size based on which the dimensional deviations are given?
    Show answer and explanation
    Answer: A —
    Basic size
    Deviations are calculated with respect to the basic size.
  70. 70.
    Which of the following statement is/are correct about the deviation is zero in shaft basics system? i. Both upper and lower deviation is zero ii. Upper deviation is zero iii. Lower deviation is zero
    Show answer and explanation
    Answer: C —
    only (ii)
    In the shaft basis system, the upper deviation of the shaft is zero (h-shaft).
  71. 71.
    How many fundamental tolerances are there in BIS system?
    Show answer and explanation
    Answer: D —
    18
    The BIS system defines 18 grades of fundamental tolerances (IT01 to IT16).
  72. 72.
    Which type of fit, the tolerance zone of the hole and shaft will overlap each other?
    Show answer and explanation
    Answer: C —
    Transition fit
    In a transition fit, the tolerance zones of the hole and shaft overlap, resulting in either clearance or interference.
  73. 73.
    _________ is designed with a 'U' slot and an Elliptical slot to accommodate the bent tail of the lathe carrier?
    Show answer and explanation
    Answer: A —
    Catch plate
    A catch plate is used to drive the lathe carrier via its bent tail.
  74. 74.
    Which of the following statement is/are correct about the different types of face plate? i. face plates with elongated radial slots and additional parallel slots ii. face plates with elongated slots and 'T' slots iii. face plates with only elongated radial slots
    Show answer and explanation
    Answer: D —
    All of the above (i, ii and iii)
    Face plates are manufactured with various slot configurations to accommodate different clamping requirements.
  75. 75.
    Which one of the following lathe accessories can be clamped at any desired position on the lathe bed by the base clamping screw?
    Show answer and explanation
    Answer: B —
    Fixed steady rest
    A fixed steady rest is clamped to the lathe bed to support long workpieces.
  76. 76.
    Which type of lathe centre is used while facing the job without disturbing the setting?
    Show answer and explanation
    Answer: C —
    Half centre
    A half centre is cut away to provide clearance for the facing tool.
  77. 77.
    Which of the following mechanism is/are correct about the working of lever type dial test indicator? i. Quick return mechanism ii. Rack and pinion mechanism iii. Lever and scroll mechanism
    Show answer and explanation
    Answer: D —
    only (iii)
    Lever type dial test indicators typically use a lever and scroll mechanism for magnification.
  78. 78.
    Which of the following tool post is easy for setting the tool centre height of the tool in a lathe?
    Show answer and explanation
    Answer: A —
    Universal tool post
    The universal tool post allows for easy adjustment of the tool height.
  79. 79.
    Which method is used to lubricate the head stock in modern lathe?
    Show answer and explanation
    Answer: D —
    Oil pump method
    Modern lathes typically use a forced oil pump system to ensure consistent lubrication of the headstock gears and bearings.
  80. 80.
    Which cutting fluid is used for turning copper?
    Show answer and explanation
    Answer: B —
    Soluble oil
    Soluble oil is commonly used as a cutting fluid for turning copper to provide cooling and lubrication.
  81. 81.
    What is the isolating medium to prevent rapid cooling after brazing a tipped tool?
    Show answer and explanation
    Answer: B —
    Mica powder
    Mica powder acts as an insulating medium to allow the brazed tool to cool slowly, preventing thermal shock.
  82. 82.
    Which mandrel is manufactured in order to reduce the number of mandrels?
    Show answer and explanation
    Answer: C —
    Stepped mandrel
    A stepped mandrel has multiple diameters, allowing it to accommodate different bore sizes and reducing the need for multiple individual mandrels.
  83. 83.
    What type operation is knurling?
    Show answer and explanation
    Answer: B —
    Forming
    Knurling is a metal forming process where a pattern is impressed onto the surface of a workpiece.
  84. 84.
    In which country the automatically controlled factory was introduced before two centuries?
    Show answer and explanation
    Answer: D —
    In Europe
    The concept of early automated production systems originated in Europe during the Industrial Revolution.
  85. 85.
    What do you mean by ATC preparation of part programming axis convention in CNC machine?
    Show answer and explanation
    Answer: B —
    Automatic tool changer
    ATC stands for Automatic Tool Changer, a feature in CNC machines that automatically swaps cutting tools.
  86. 86.
    Which one of the direction shown by thumb finger in right hand cordinate system?
    Show answer and explanation
    Answer: D —
    Direction of 'X' axis
    In the right-hand coordinate system, the thumb represents the X-axis, the index finger the Y-axis, and the middle finger the Z-axis.
  87. 87.
    Which axis the spindle moves on vertical machining centre?
    Show answer and explanation
    Answer: A —
    Z axis
    In a vertical machining center, the spindle moves along the vertical Z-axis.
  88. 88.
    What do you mean by MPG?
    Show answer and explanation
    Answer: B —
    Manually pulse generator
    MPG stands for Manual Pulse Generator, used for manual axis movement in CNC machines.
  89. 89.
    What is the basis of absolute co-ordinate point?
    Show answer and explanation
    Answer: D —
    Based on the origin (0.0)
    Absolute coordinates are measured from a fixed origin point (0,0).
  90. 90.
    How the points are marked in polar co-ordinate system?
    Show answer and explanation
    Answer: A —
    Pole as O and polar axis as L
    In polar coordinates, points are defined by a distance from a fixed point (pole) and an angle from a fixed direction (polar axis).
  91. 91.
    Which code is suitable for multiple turning cycle in FANUC CNC control system?
    Show answer and explanation
    Answer: C —
    G 71
    G71 is the standard canned cycle code for multiple turning operations in FANUC controls.
  92. 92.
    Which mode is used to move the turret in micron level?
    Show answer and explanation
    Answer: D —
    Incremental jog mode
    Incremental jog mode allows for precise, small-increment movements of the turret.
  93. 93.
    Which is the operation in point to point system?
    Show answer and explanation
    Answer: A —
    Drilling
    Drilling is a classic point-to-point operation where the tool moves to a specific coordinate and performs the action.
  94. 94.
    Which of the following feed back devices can sense both speed and position?
    Show answer and explanation
    Answer: C —
    Encoder
    Encoders provide feedback on both the position and speed of the motor shaft.
  95. 95.
    What is the purpose of MDI mode?
    Show answer and explanation
    Answer: B —
    Move the axis by manually
    MDI (Manual Data Input) mode allows the operator to manually input and execute commands or move axes.
  96. 96.
    What is the M in the ISO designation for the lathe tool holder?
    Show answer and explanation
    Answer: A —
    Holder length
    In the ISO designation system for tool holders, the letter 'M' typically refers to the holder length.
  97. 97.
    What is 'N' in ISO standard for specifying tool insert, for example CNMG120408?
    Show answer and explanation
    Answer: D —
    Relief angle
    In the insert code CNMG, the 'N' represents the relief angle of the insert.
  98. 98.
    What will be displayed on the screen which simulation?
    Show answer and explanation
    Answer: B —
    Graph of the component
    Simulation displays a graphical representation of the component being machined to verify the program.

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