Practice Test: Question Set - 22
1. The stress in the threaded part of the bolt will be __________ as compared to the shank.
- (A) Same
- (B) Higher
- (C) Lower
- (D) None
of these
2. In designing a connecting rod, it is considered like __________ for buckling about Y-axis.
- (A) Both
ends hinged
- (B) Both
ends fixed
- (C) One
end fixed and the other end hinged
- (D) One
end fixed and the other end free
3. For a square key made of mild steel, the shear and crushing strength are related as
- (A) Shear
strength is equal to crushing strength
- (B) Shear
strength is greater than crushing strength
- (C) Shear
strength is less than crushing strength
- (D) None
of the above
4. In thrust bearings, the load acts
- (A) Along
the axis of rotation
- (B) Parallel
to the axis of rotation
- (C) Perpendicular
to the axis of rotation
- (D) In
any direction
5. When compared to the rod of the same diameter and material, a wire rope
- (A) Is
less flexible
- (B) Has
a much smaller load carrying capacity
- (C) Does
not provide much warning before failure
- (D) Provides
much greater time for remedial action before failure
6. In the assembly of pulley, key and shaft
- (A) Pulley
is made the weakest
- (B) Key
is made the weakest
- (C) Key
is made the strongest
- (D) All
the three are designed for equal strength
7. Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)
- (A) 0.124
- (0.684/T)
- (B) 0.154 -
(0.912/T)
- (C) 0.175 -
(0.841/T)
- (D) None
of these
8. Which of the following statement is correct?
- (A) The distance
from a point on one thread to the corresponding point on the next thread is
called pitch
- (B) The
distance which a screw thread advances axially in one rotation of the nut is called
lead
- (C) In
single start threads, lead is equal to pitch
- (D) All
of the above
9. The design of shafts made of brittle materials is based on
- (A) Guest's
theory
- (B) Rankine's
theory
- (C) St
Venant's theory
- (D) Von
Mises theory
10. When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be
- (A) F/bh
- (B) 3F/2bh
- (C) 2F/bh
- (D) 4F/bh
11. The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to
- (A) Static
load
- (B) Dynamic
load
- (C) Static
as well as dynamic load
- (D) Completely
reversed load
12. Two shafts will have equal strength, if
- (A) Diameter of
both the shafts is same
- (B) Angle
of twist of both the shafts is same
- (C) Material of
both the shafts is same
- (D) Twisting
moment of both the shafts is same
13. The pitch diameter is the __________ diameter of an external or internal screw thread.
- (A) Effective
- (B) Smallest
- (C) Largest
- (D) None of
these
14. The efficiency of a square threaded screw is maximum if the helix angle is equal to
(Where φ = Angle of friction)
- (A) 90° - φ
- (B) 45° - φ
- (C) 45° - φ/2
- (D) 45° +
φ/2
15. The efficiency of a square threaded screw is maximum if the helix angle is equal to
(Where φ = Angle of friction)
- (A) (1/2) × √(σ² + 4τ²)
- (B) √(σ² + 4τ²)
- (C) (1/2)
× [σ + √(σ² + 4τ²)]
- (D) σ +
√(σ² + 4τ²)
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