CNC Machines MCQ Questions and Answers Quiz

11. A machine will be said to have CNC control if

  1. The dimensions of the work piece are measured by sensors while cutting is going on
  2. The tool motion is guided by drum cams and disc cams
  3. the loading and unloading of the work piece ON and OFF the machine respectively is made automatic
  4. control is achieved by employment of alphanumeric data

12. CNC is not applicable in

  1. Drilling machine
  2. Milling machine
  3. Lathe
  4. none of the above

13. The main advantage of computer numerical control over conventional automatic control which is referred to sometimes as fixed automation is

  1. CNC is stylish while automatic conventional control is not
  2. CNC allows for application of higher cutting speeds and feeds
  3. CNC is applicable in unmanned satellites
  4. CNC offers higher flexibility than conventional automatic control (fixed automation)

14. For milling a bilaterally symmetrical 2-D profile on metal plate 10 millimetres thick, a CNC milling machine would require the following accessory or attachment

  1. Copy milling attachment
  2. Dividing head
  3. Reversing table
  4. none of the above

15. In a CNC machining centre, any complex cutting motion involving X, Y and Z moments is carried out by

  1. Use of jigs, cams, templates and tracers
  2. skill of the machine operator
  3. combinations of movements obtained from motors along the axis
  4. none of the above

16. What is the purpose of using recirculating ball screw nut mechanism in CNC machine

  1. to reduce the setup time
  2. for higher surface finish
  3. for carrying out up-milling
  4. to remove backlash

17. In a CNC turning centres, threads of different pitches are cut by

  1. Different settings of the meander drive and Norton Tumbler gears
  2. Different settings of the feed gearbox
  3. Different settings of the speed gearbox
  4. none of the above

18. In a point-to-point feed axis employing a stepper motor as a prime mover

  1. an encoder for position feedback is a must
  2. an interpolator is a must
  3. a tachogenerator is a must
  4. none of the above

19. In computer controlled machine tools terminal clergy, machining centre is

  1. the origin of the machine coordinate system with respect to which the operator has to make his program
  2. the centre of the cutter which actually goes to the programmed point when used without radius compensation
  3. a computer-controlled machine tool capable of a variety of operations involving rotating cutters
  4. none of the above

20. In computer-controlled machine tools, tool movements are controlled by

  1. Cam
  2. machine operator
  3. foolproof mechanism
  4. none of the above
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