The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is

A. 1.02

B. 1.32

C. 1.66

D. 1.82

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Crater wear is mainly due to the phenomenon known as
  2. The in-feed grinding is used to
  3. Hardness of green sand mould increases with
  4. For softer materials, the point angle of the drill is kept
  5. In centre less grinders, the maximum angular adjustment of the regulating wheel is
  6. Gear finishing operation is called
  7. In down milling, the thickness of chip is
  8. A tool used to withdraw a drill from the sleeve is called
  9. Which one of the following is a solid state joining process?
  10. The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face…
  11. In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth…
  12. When the cutting edge of the tool is dull, then during machining
  13. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter…
  14. Ultrasonic machining is best suited for
  15. The rake angle required to machine brass by high speed steel tool is
  16. The angle on which the strength of the tool depends is
  17. In electro-discharge machining, dielectric is used to
  18. The method of grinding used to produce internal cylindrical holes and tapers, is
  19. The drill spindles are provided with standard taper known as
  20. In a planer
  21. The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive…
  22. In centreless grinders, the regulating wheel is inclined at
  23. The hardness of a grinding wheel is determined by the
  24. For turning internal tapers, the suitable method is
  25. The cutting fluid mostly used for machining steel is
  26. The cutting fluid mostly used for machining alloy steels is
  27. The machining of titanium is difficult due to
  28. An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability…
  29. The purpose of jigs and fixtures is to
  30. In which of the following machine, the work rotates and the tool is stationary?