Objective Questions 433
dharm
d:\N-Design\Des22-1.pm5
22. The angle of an ACME thread is _____ degrees.
(a) 48 (b) 90 (c) 29 (d) 45
23. The distance across corners of a hexagonal nut is equal to _____.
(a) 2D (b) 1.5D (c) 1.2D
24. The angle of worm thread is _____ degrees.
(a) 45 (b) 29 (c) 55
25. The angle of a buttress thread is _____ degrees.
(a) 90 (b) 50 (c) 45 (d) 29
26. In conventional representation of external thread in section, the hatching is extended upto
the core diameter (True/False).
27. In conventional representation of internal thread in section, the hatching is extended upto
the root (major) diameter (True/False).
28. The height of hexagonal nut is _____.
(a) D (b) 1.1D (c) 1.3D
29. In conventional sectioned representation of threads in engagement, hatching is extended
upto core diameter of the bolt and its nominal diameter is shown as continuous line (True/
False).
30. A washer is used for adjusting the height of the bolt (True/False).
31. _____ neck is used to prevent the rotation of the bolt.
32. _____ bolt is used for lifting heavy machinery.
33. Stud bolt has threads to full length (True/False).
34. The thickness of locknut is more than the standard nut (True/False).
35. _____ nut is used to protect the bolt end from damages.
36. A screw has threads to full length (True/False).
37. A bolt has threads to full length (True/False).
38. Cap screws are smaller in size when compared to machine screws (True/False).
39. _____ is used to tighten socket headed screws.
40. Set-screws are used only for transmitting very light loads (True/False).
41. Grub screw is a cap screw (True/False).
42. _____ locknut is used in automobile works.
43. A spring washer is used to adjust the height of the nut (True/False).
44. _____ foundation bolt is common and simple.
45. _____ is used in Lewis foundation bolt.
46. _____ is used in cotter foundation bolt.
CHAPTER 6
1. A key is a temporary joint (True/False).
2. A cotter is a permanent joint (True/False).
3. Pin joints may be temporary or permanent joints (True/False).
4. The standard taper on the face of a key is _____.
5. Taper sunk key is tapered on both sides (True/False).
6. Saddle keys are used for light duties (True/False).
