Mechanical Threaded Joints MCQ - Set 03 - ObjectiveBooks

# Practice Test: Question Set - 03

1. When a nut is tightened by placing a washer below it, the threads of bolt are subjected to
(A) Direct shear stress
(B) Torsional shear stress
(C) Tensile stress
(D) Compressive stress

2. The shock absorbing capacity of a bolt can be increased by
(A) Increasing stress in shank
(B) Increasing stress in core diameter of threads
(C) Decreasing stress in shank
(D) Decreasing stress in core diameter of threads

3. A washer is specified by
(A) Outer diameter
(B) Inner diameter
(C) Thickness
(D) Mean diameter

4. Jam nut is a locking device in which
(A) A smaller nut is tightened against main nut creating friction at the contacting surface
(B) A split pin is passed through diametrically opposite slots in nut and a hole in bolt and the two ends of split pin are separated and bent back on nut
(C) A slot is cut in the middle of nut along the length and a cap screw is provided to tighten the two parts of nut separated by slot
(D) An elastic piece is tightened in the nut by a setscrew

5. Standard coarse threads are equally strong in failure by shear and failure by tension, if the height of nut is
(A) h = 0.4 d
(B) h = 0.6 d
(C) h = 0.5 d
(D) h = d

Where, d is nominal diameter of threads

6. The largest diameter of external or internal screw thread is called
(A) Major diameter
(B) Minor diameter
(C) Pitch diameter
(D) None of the above

7. The connecting rod bolts are tightened up so that the initial tightening stress
(A) Approaches yield point
(B) Approaches endurance limit
(C) Approaches (yield point stress/factor of safety)
(D) Approaches (endurance limit stress/factor of safety)

8. A screw is specified by
(A) Major diameter
(B) Minor diameter
(C) Pitch diameter
(D) Mean diameter

9. The shock absorbing capacity of a bolt can be increased by
(A) Increasing shank diameter
(B) Making shank diameter equal to core diameter of threads
(C) Using castle nut in place of ordinary hexagonal nut
(D) Using a washer

10. Allen key is used to tighten
(A) Cap screw with hexagonal head
(B) Cap screw with fillister head
(C) Cap screw with hexagonal socket head
(D) Cap screw with flat head

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