Machine Design Objective Questions and Answers - Set 22

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) ×+ √(σ² + 4τ²)]
    (D) σ + √(σ² + 4τ²)

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