Principles of Machine Design Mid - I, September - 2014

1.The toughness of a material __________ when it is heated.
  • remains constant
  • increases
  • decreases
  • none of the above
Answer: C
2.In unilateral system of tolerance, the tolerance is allowed on one side of the actual size
  • one side of the nominal size
  • both sides of the actual size
  • both sides of the nominal size
Answer: B
3.Surface endurance limit of gear material is dependent upon its elastic strength
  • yield strength
  • brinell hardness number
  • toughness
Answer: C
4.The maximum normal stress theory is used for brittle materials
  • ductile materials
  • plastic materials
  • non-ferrous materials
Answer: A
5.The 'theoretical' or 'geometric' stress concentration factor Kt or Kts is used torelate the actual _______________ stress at the discontinuity to the nominal stress.
  • Minimum
  • maximum
  • shear
  • zero
Answer: B
6.High notch sensitivity is usually associated with ______________ materials.
  • Brittle materials
  • ductile materials
  • tough materials
  • none of the above
Answer: A
7.The diameter of the rivet hole is usually ______________ the nominal diameter of the rivet.
  • equal to
  • less than
  • more than
  • None of the above
Answer: C
8.In a fusion welding process,
  • Only heat is used
  • only pressure is used
  • combination of heat and pressure is used
  • none of these
Answer: A
9.Which of the following cotter joint is used to connect strap end of a connecting rod ?
  • Socket and spigot cotter joint
  • Sleeve and cotter joint
  • Gib and cotter joint
  • none of these
Answer: C
10.The usual proportion for the width of key is (d is diameter of the shaft)
  • d/8
  • d/6
  • d/4
  • d/2
Answer: C
11._______________ is the ability of a material to resist the application of load without rupture.
Answer: Strength
12.A __________________________ is a location in an object where stress is concentrated.
Answer: Stress concentration / stress raisers
13._________________ is defined as the extent to which the sensitivity of a material to fracture is increased by the presence of a surface in homogeneity such as a notch, a sudden change in section, a crack, or a scratch.
Answer: Notch sensitivity
14._______________riveted butt joints with double straps should have the highest efficiency as per Indian Boiler Regulations.
Answer: Quadruple riveted
15.The parallel fillet welded joint is designed for ____________________.
Answer: Shear strength
16.A feather key is generally tight in _________ and loose in ____________.
Answer: Shaft, hub
17.A transmission shaft subjected to bending loads must be designed on the basis of ___________________.
Answer: Maximum normal stress theory
18.The ratio of the ultimate stress to the design stress is known as ________________.
Answer: Factor of safety
19.A rivet is specified by __________________.
Answer: Shank diameter
20.A _______________ lowers both the strength and rigidity of the shaft.
Answer: Keyway