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
- (B) External
applied load
- (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) h = dc
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) h = dc
Where, dc = core diameter of threads
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