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Machine Design 2: Gears
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Machine Design 2: Gears
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25 Questions

1. In cycloidal gears contact area is
2. Velocity ratio and transmission ratio are the same thing.
3. Which of the following is not true about gears?
4. A V-belt pulley transmits power to flat belt pulley. If the coefficient of friction is 0.25 then which pulley governs the design? (β = 21o & α = 0.2)
5. Which of the following formula is used to calculate oil-film thickness in hydrodynamic bearings?
6. Spur gears can be used only when the two shafts are parallel.
7. Pressure angle is _____ in case of cycloidal teeth.
8. The teeth of the helical gears are cut parallel to the shaft axis.
9. A journal of 120 mm diameter rotates in a bearing at a speed of 1000 rpm. What is the power lost during friction if 8 kN radial load acts on the journal and coefficient of friction is 2.525 x 10-3?
10. Product of diametric pitch and circular pitch is?
11. Cycloidal teeth consist of
12. Greater the velocity ratio, smaller the gearbox.
13. Diameteral pitch is 5, then calculate module of the gear.
14. Is it possible to transmit power between shafts lying in different planes using gears?
15. Bevel gears impose ____ loads on the shafts.
16. What does number 6 indicate in the class of wire rope 6 x 37 (18/12/6/1)?
17. Which of the following are true for worm gears?
18. Lubricating oil used in hydrodynamic bearing has total flow rate of 0.340 l/min and side leakage of 0.1520 l/min. If mass density of oil is 600 kg/m3 and specific heat is 1.05 kJ/kg oC, what is the rise in temperature if power lost in friction is 0.05 kW?
19. Gear drive don’t require precise alignment of shafts.
20. Lang lay ropes offer more resistance to __________
21. Which of the following statements is/are true for V-belts?
22. A V-belt pulley has belt velocity 20 m/s and mass 0.7 kg per meter. If allowable tension in the belt is 600 N then what will be the power transmitting capacity of belt?(Assume μ = 0.5 & θ = 2.5 rad)
23. The two gears are said to have conjugate motion if
24. Contact ratio is always
25. Pressure angle remains constant in case of involute profile.

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