22. (2) excessive rolling pressure caused by dynamic loads that dislodge surface
ID: 2088641 • Letter: 2
Question
22. (2) excessive rolling pressure caused by dynamic loads that dislodge surface particles 28. (2) Which of the following is/are the cause of bearing falure? a) Galling b) Brinnel c) Fatigue d) Spalling e) All of these a) Sudden rise in bearing load b) Inappropriate bearing selection c) improper mounting d) All of these 23. (2) Creep is: (2) Excessive vibration, motion, mis- alignment is a 29. failure a) Small amplitude un-intended 6Slow plastic deformation over a) impact b) Creep oscillatory motion c) Fretting d) yield c) Weird person stalking you d) Sudden brittle rupture e) Sudden ductile fracture 30. (2) A S mm module 20 tooth pinion meshes with a 63-10oth gear. Circular pitch is 24. (2) A 400 RPM 02-saries deep groove ball bearing under 8 kN radial and 2 kN axial loads must last 10,000 hours with 99% reliability. Select one with bore a) 207 mm b) 100 mm c) 315 mm d) 3.15 mm e) None of these a) 10 b) 40 31. (2) Pressure angle is always a) Negative Zero Positive None of these d) None of these 25. (2) How many rolling elements are present inside a hydrodynamic bearing? 32. (2) Sudden catastrophic separation a) 20 b) 13 c) 15 from fluctuating loads over time and resulting crack propagation al creep b) corrosion c) yield d) Brinnel e) none of these e) none of these 26. A 200 RPM bearing under 11 kips must last 20,000 hours with 99% reliability. Select one withdynamic load rating 33. (2) Static normal loads between two curved surfaces in contact producing significant plastic flow and permanent surface discontinuity: a) 240 kips b) 506 kips c) 80 kips d) 10,400 kips e) None of these a) Spalling b) Brinelling c) Yield 27. (2) Angular contact thrust bearings d) Corrosion a) Are unstable b) React chucking loads c) Must be perfectly aligned d) Produce no noise 34. (2) First law of gearing states that a) Radial velocity > zero b) Gear teeth must mesh c) Radial acceleration is zero d) None of theseExplanation / Answer
22)a
Excessive rolling pressure caused by dynamic loads that dislodge surface particles is called "Brinnelling". Hence, the answer is b.
23)a
Creep is a slow plastic deformation over a period of time. Hence, the answer is b.
24)a
The bore is
25)a
In hydrodynamic bearings, there will be no rolling elements. Hence, the answer is none of these. So, the answer is e.
27)a
Angular contact thrust bearings must be perfectly aligned. Hence, the answer is c.
28)a
The following are reasons for failure:
1) Sudden rise in bearing load
2) Inappropriate bearing selection
3) Improper mounting
Hence, the answer is all the above. So, the answer is d.
29)
Excessive vibrations, motion, misalignment is a fretting failure. Hence, the answer is c.
30)
circular pitch=pi*module
p=3.14*5=15.7 mm.
Hence, the answer is none of these.So, the correct answer is e.
31)a
Pressure angle is always positive. Hence, the answer is c.
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