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  • Question
  • The constant factor in case of R10 series of preferred numbers is


  • Options
  • A. 1.06
  • B. 1.12
  • C. 1.26
  • D. 1.58

  • Correct Answer
  • 1.26 


  • Machine Design problems


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    • 1. Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

    • Options
    • A. shaft B is better than shaft A
    • B. shaft A is better than shaft B
    • C. both the shafts are equally good
    • Discuss
    • 2. The application of third type levers is found in

    • Options
    • A. handle of a hand pump
    • B. hand wheel of a punching press
    • C. lever of a loaded safety valve
    • D. a pair of tongs
    • Discuss
    • 3. According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

    • Options
    • A. d = t
    • B. d = 1.6 t
    • C. d = 2 t
    • D. d = 6 t
    • Discuss
    • 4. Which of the following material has the maximum ductility?

    • Options
    • A. Mild steel
    • B. Copper
    • C. Zinc
    • D. Aluminium
    • Discuss
    • 5. In a flange coupling, the flanges are coupled together by means of

    • Options
    • A. bolts and nuts
    • B. studs
    • C. headless taper bolts
    • D. none of these
    • Discuss
    • 6. The sleeve or muff coupling is designed as a

    • Options
    • A. dun cylinder
    • B. thick cylinder
    • C. solid shaft
    • D. hollow shaft
    • Discuss
    • 7. A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

    • Options
    • A. less than 20 d
    • B. greater than 30 d
    • C. between 20 d and 30 d
    • D. equal to inside diameter of pipe
    • Discuss
    • 8. Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

    • Options
    • A. elastic strength
    • B. yield strength
    • C. shear strength
    • Discuss
    • 9. A screw is said to be over hauling screw, if its efficiency is

    • Options
    • A. less than 50%
    • B. more than 50%
    • C. equal to 50%
    • D. none of these
    • Discuss
    • 10. According to Indian standard specifications, 100 H6/g5 means that the

    • Options
    • A. actual size is 100 mm
    • B. basic size is 100 mm
    • C. difference between the actual size and basic size is 100 mm
    • D. none of the above
    • Discuss


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