51. If two springs are in parallel then their overall stiffness will be
half
same
double
unpredictable
none of the above.
Correct answer: (C) double
52. In composite or reverse laid ropes
direction of twist of wires in strands is opposite to the direction of twist of strands
direction of twist of wires and strands are same
wires in two adjacent strands are twisted in opposite direction
wires are not twisted
none of the above.
Correct answer: (C) wires in two adjacent strands are twisted in opposite direction
53. In cross or regular lay ropes
direction of twist of wires in strands is opposite to the direction of twist of strands
direction of twist of wires and strands are same
wires in two adjacent strands are twisted in opposite direction
wires are not twisted
none of the above.
Correct answer: (A) direction of twist of wires in strands is opposite to the direction of twist of strands
54. In hydrodynamic bearings
the oil film pressure is generated only by the rotation of the journal
the oil film is maintained by supplying oil under pressure
do not require external supply of lubricant
grease is used for lubrication
none of the above.
Correct answer: (A) the oil film pressure is generated only by the rotation of the journal
55. In hydrostatic bearings
the Oil film pressure is generated only by the rotation of the journal
the oil film is maintained by supplying oil under pressure
do not require external supply of lubricant
grease is used for lubrication
none of the above.
Correct answer: (B) the oil film is maintained by supplying oil under pressure
56. In most machine members, the damping capacity of the material should be
low
zero
high
could be anything
none of the above.
Correct answer: (C) high
57. In nitrated parts, the origins of the fatigue cracks will occur at
surface
just below the surface
within the core
could occur anywhere
none of the above.
Correct answer: (E) none of the above.
58. In oilness bearings
the oil film pressure is generated only by the rotation of the journal
the oil film is maintained by supplying oil under pressure
do not require external supply of lubricant
grease required to be applied after some intervals
none of the above.
Correct answer: (C) do not require external supply of lubricant
59. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
d
1.25 d
1.5 d
1.75 d
2 d.
Correct answer: (C) 1.5 d
60. In order to obtain bolt of uniform strength
increase shank diameter
increase its length
drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
tighten die bolt properly
all of the above.
Correct answer: (C) drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread