Design of Machine Members Mid - II, November - 2014

1.Which key transmits power through frictional resistance only
  • Wood ruff key
  • Kennedy
  • Sunk
  • Saddle
Answer: D
2.Shape of wood ruff key is like
  • Cylinder
  • Semicircle
  • Sphere
  • Tapered key
Answer: B
3.In a muff coupling, the effective length of the key is
  • Equal to sleeve length
  • Equal to half of the sleeve length
  • Double the sleeve length
  • Independent of sleeve length
Answer: B
4.A key way lowers
  • The strength of the shaft
  • The rigidity of the shaft
  • Both the Strength and Rigidity of the shaft
  • the ductility of the material of the shafts.
Answer: C
5.A Cotter joint is used to transmit
  • axial tensile load only
  • axial compressive load only
  • Combined axial and twisting loads
  • Axial tensile or Compressive loads.
Answer: D
6.If a spring is cut –down in to two equal half springs the stiffness of the cut spring will be
  • approximately half
  • same
  • approximately double
  • unpredictable
Answer: C
7.Concentric helical springs should be
  • Wound in the same direction
  • wound with opposite hand helices
  • Could be wound in any direction
  • None
Answer: B
8.Spring index is
  • Coil diameter /Wire diameter
  • Its capacity of storing energy
  • Load required to produce unit deflection
  • Indication of the quality of spring.
Answer: A
9.A leaf spring in automobiles is used
  • to apply forces
  • to measure forces
  • to absorb shocks
  • to store strain energy.
Answer: C
10.An axle is subjected to
  • Bending only
  • Direct load only
  • Torsion only
  • All of the above
Answer: A
11.The permissible crushing stress for the usual key material is at least ______________ permissible shearing stress.
Answer: Twice
12.The design of shafts made of brittle materials is based on _____________________ theory.
Answer: Rankine’s
13.Two shafts will be have equal strength if ________________________.
Answer: Twisting moment of both the shafts is same.
14.Two shafts A and B are made of the same material the diameter of shaft B is twice that of shaft A. The ratio of power which can be transmitted by shaft A to that of shaft B is ___________.
Answer: 1/8
15.When a close coil helical spring is compressed its wire is subjected to _____________.
Answer: Tension
16.Hook’s coupling is used to connect two shafts whose axes intersect at a ____________.
Answer: Small angle
17.A Cotter joint is a __________________ fastening and is used to connect rigidly two co-axial rods or bars which are subjected to axial tensile or compressive forces.
Answer: Temporary
18.A knuckle joint is used to connect two rods which are under the action of __________ loads.
Answer: Tensile loads
19.The nature of stress induced in the holding down bolts in a compression coupling is ___________.
Answer: Tensile stress
20.The taper on a sunk key is provided on _________________ only.
Answer: Top surface