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MCQs

Total Questions : 1798 | Page 8 of 180 pages
Question 71. Low helix angle drills are preferred for drilling holes in
  1.    Plastics
  2.    Copper
  3.    Cast steel
  4.    Carbon steel
 Discuss Question
Answer: Option A. -> Plastics
Question 72. The relief or clearance at the cutting edge of a flat drill varies from
  1.    3° to 8°
  2.    20° to 30°
  3.    60° to 90°
  4.    90° to 120°
 Discuss Question
Answer: Option A. -> 3° to 8°
Question 73. The carbide tools operating at very low cutting speeds (below 30 m/min)
  1.    Reduces tool life
  2.    Increases tool life
  3.    Have no effect on tool life
  4.    Spoils the work piece
 Discuss Question
Answer: Option A. -> Reduces tool life
Question 74. High speed steel tools retain their hardness up to a temperature of
  1.    250°C
  2.    350°C
  3.    500°C
  4.    900°C
 Discuss Question
Answer: Option D. -> 900°C
Question 75. Stellite preserves hardness up to a temperature of
  1.    350°C
  2.    500°C
  3.    900°C
  4.    1100°C
 Discuss Question
Answer: Option D. -> 1100°C
Question 76. For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
  1.    50°C
  2.    100°C
  3.    175°C
  4.    275°C
 Discuss Question
Answer: Option B. -> 100°C
Question 77. In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
  1.    Circular interpolation in counter clockwise direction and incremental dimension
  2.    Circular interpolation in counter clockwise direction and absolute dimension
  3.    Circular interpolation in clockwise direction and incremental dimension
  4.    Circular interpolation in clockwise direction and absolute dimension
 Discuss Question
Answer: Option C. -> Circular interpolation in clockwise direction and incremental dimension
Question 78. In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
  1.    Depth of cut
  2.    Cutting speed
  3.    Feed
  4.    Tool rake angle
 Discuss Question
Answer: Option B. -> Cutting speed
Question 79. In determining the various forces on the chip, Merchant assumed that the
  1.    Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
  2.    Only continuous chip without built-up-edge is produced
  3.    Cutting velocity remains constant
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 80. In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be
  1.    10 microns
  2.    20 microns
  3.    30 microns
  4.    60 microns
 Discuss Question
Answer: Option C. -> 30 microns

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