Threaded Joints Multiple Choice Questions - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. Castle 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

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

3. The resultant axial force on bolt depends upon
(A) Initial tension
(C) Stiffness of bolt and parts held by bolt
(D) All three factors

4. While designing screw threads, adequate length of engaged threads between the screw and nut is provided so as to prevent failure of threads due to
(A) Direct shear stress
(B) Torsional shear stress
(C) Tensile stress
(D) Compressive stress

5. Setscrews are
(A) Similar to tap bolts except that a greater variety of shapes of heads are available
(B) Slotted for screw driver and generally used with a nut
(C) Used to prevent relative motion between parts
(D) Similar to studs

6. When the shear strength of nut is half the tensile strength of bolt, the height of nut (h) should be
(A) h = 0.5 dc
(B) h = 0.25 dc
(C) h = 0.75 dc
(D) hdc

Where, dc = core diameter of threads

7. The connecting rod bolts are tightened up with the initial tension greater than external load so that
(A) Failure of bolt will be static
(B) The resultant load on bolt will not be affected by external cyclic load
(C) The bolt will not fail by fatigue although the external load is fluctuating
(D) All the three

8. The inner diameter of washer is
(A) Equal to the nut size
(B) More than the nut size
(C) Less than the nut size
(D) Independent of the nut size

9. The designation M 36 × 2 means
(A) Metric fine threads of 36 mm outside diameter and 2 mm pitch
(B) Metric coarse threads of 36 mm outside diameter and 2 mm pitch
(C) Metric threads of 36 mm pitch diameter and 2 mm pitch
(D) Metric threads of 36 mm core diameter and 2 mm pitch

10. When the shear strength of nut is equal to the tensile strength of bolt, the height of nut (h) should be
(A) h = 0.5 dc
(B) h = 0.25 dc
(C) h = 0.75 dc
(D) hdc

Where, dc = core diameter of threads

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