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  • Question

  • 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


  • Options
  • A. 1.02
  • B. 1.32
  • C. 1.66
  • D. 1.82

  • Correct Answer
  • 1.32 

    • More questions

    • 1. Slow speed of the spindle is necessary in

    • Options
    • A. thread cutting
    • B. turning a work of larger diameter
    • C. turning a hard or tough material
    • D. all of these
      • Discuss
    • 2. A zinc diffusion process is called

    • Options
    • A. galvanising
    • B. anodising
    • C. parkerising
    • D. sherardizing
      • Discuss
    • 3. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

    • Options
    • A. 0.25 kW
    • B. 0.75 kW
    • C. 1.75 kW
    • D. 3.75 kW
      • Discuss
    • 4. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 5. A basic hole is one whose

    • Options
    • A. lower deviation is zero
    • B. upper deviation is zero
    • C. lower and upper deviations are zero
    • D. none of these
      • Discuss
    • 6. The cutting fluid mostly used for machining steel is

    • Options
    • A. water
    • B. soluble oil
    • C. dry
    • D. heavy oils
      • Discuss
    • 7. Which of the following iron exist between 910° C and 1403° C?

    • Options
    • A. ?-iron
    • B. ?-iron
    • C. ?-iron
    • D. ?-iron
      • Discuss
    • 8. The loss of pressure head in case of laminar flow is proportional to

    • Options
    • A. velocity
    • B. (velocity)2
    • C. (velocity)3
    • D. (velocity)4
      • Discuss
    • 9. The refrigerant carbon dioxide is not widely used because of its __________ power require ments per tonne of refrigeration and high operating pressures.

    • Options
    • A. low
    • B. high
      • Discuss
    • 10. Shrinkage allowance is made by adding to external dimensions and subtracting from internal dimensions.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss

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