Design of Machine Members - I Mid - II, November - 2014

1.A feather key is generally
  • Loose in shaft and tight in hub
  • Tight in shaft and loose in hub
  • Tight in both shaft and hub
  • Loose in both shaft and hub.
Answer: B
2.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
3.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
4.Two shafts will have equal strength, if
  • Diameter of both the shafts is same
  • Angle of twist of both the shafts is same
  • Material of both the shafts is same
  • Twisting moment of both the shafts is same
Answer: D
5.The design of shafts made of brittle materials is based on
  • Guest’s theory
  • Rankine’s theory
  • St. Venant’s theory
  • Von Mises Theory
Answer: B
6.The sleeve or muff coupling is designed as a
  • Thin cylinder
  • Thick cylinder
  • Solid shaft
  • Hollow shaft
Answer: D
7.The spring mostly used in gramophones is
  • Helical spring
  • Conical spring
  • Laminated spring
  • Flat spiral spring
Answer: D
8.When helical compression spring is cut into halves, the stiffness of the resulting spring will be
  • Same
  • Double
  • One-half
  • One-fourth
Answer: B
9.Concentric or composite spring is used for the purpose of
  • To obtain greater spring force within a given space
  • To insure the operation of a mechanism in the event of failure of one of the springs
  • Both
  • None
Answer: C
10.The relation for energy stored in the helical spring of circular wire can be written as
  • ((2/4KG))V
  • ((/4K2G))V
  • ((2/4K2G))V
  • ((/4K2G)
Answer: C
11.The type of stresses developed in the key is/are ___________________.
Answer: Both shear and bearing stresses
12.When a pulley or other mating piece is required to slide along the shaft, a __________sunk key is used.
Answer: Parallel
13.For a square key made of mild steel, the shear strength is ______________ crushing strengths.
Answer: Equal
14.In a steam engine, the piston rod is usually connected to the crosshead by means of a ______________.
Answer: Cotter joint
15.Two shafts A and B are made of the same material. The diameter of the shaft A is twice as that of shaft B. The power transmitted by the shaft A will be ____________ of shaft B.
Answer: Eight times
16.A transmission shaft subjected to bending loads must be designed on the basis of _________________.
Answer: Maximum normal stress theory
17.When a shaft is subjected to a bending moment M and a twisting moment T, then the equivalent twisting moment is equal to _________________.
Answer: √( M2 .T2)
18.When a helical compression spring is subjected to an axial compressive load, the type of stress induced in the wire is___________________.
Answer: Shear stress
19.When two concentric coil springs made of the same material, having same length and compressed equally by an axial load, the load shared by the two springs will be _____________ to the square of the diameters of the wires of the two springs.
Answer: Soderberg line
20.The helical springs subjected to fatigue loading are designed by using the _________________.
Answer: