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1.
A deep groove ball bearing rotating at 1200 r.p.m. is subjected to radial and an axial force of 2000 N and 1500 N respectively. What will be the basic dynamic capacity of bearing if 20,000 hours is the rating life?
(Consider radial factor = 0.55, Thrust factor = 2 & application factor = 1.5?
(Consider radial factor = 0.55, Thrust factor = 2 & application factor = 1.5?
2.
A straight bevel gear is manufactured by cutting process and maximum tangential force of 12000 N acts on it. What is the effective load acting between meshing teeth if pitch line velocity is 130 m/s?
3.
A bevel gear made of steel pinion and steel gear has dynamic factor C equal to __________
4.
A bevel gear consists of steel pinion and cast iron gear having pitch line velocity of 10 m/s. The maximum tangential force acting on the gear is 1500 N and face width is 40 mm. What is the dynamic load acting on this single stage bevel gear box if sum of errors on meshing teeth is 10 x 10-3 N/mm? (Use Buckingham's equation)
5.
What is the pitch line velocity if pinion has pitch circle diameter of 35 mm and rotates at 1000 r.p.m transmitting power of 250 kW to the gear?
6.
A bevel gear has pitch circle diameters of pinion and gear as 20 mm and 40 mm respectively. What is the face width of bevel gear?
(m =module)
7.
Which of the following statements is/are true?
8.
To avoid interference the minimum number of teeth required on helical pinion decreases as helix angle ________
9.
Which of the following formulae is used to determine minimum number of teeth required on helical pinion to avoid interference?
10.
What is the minimum face width required for a helical gear which has helix angle of 23o and normal module of 7?