1) it’s smooth to drive the gear. 2) in gears contact is only point, this type is curve take the more load than normal one
How Trains take turns, though there is no any differential
Purpose of the differential is to enable vehicles to take turn, by allowing both the wheel to rotate with different speed. This is required when wheels, like in car, are connected with same axle. Interestingly, wheel in trains are not connected with the axle, they are independent and hence can take turns without ant differential. This is same as how the bullock cart takes turns, without any differential.
Why freezer in the fridge is placed in top level?
Because density of cold air is higher than warm air,hence itis placed at top.Cold air comes downward & cool the bottom part.
what is more dangerous longitudinal stress or Hoop stress and why?
Hoop stress is more dangerous than longitudinal stress, because the dangerous area coming under the hoop stress is circumferential,while in longitudinal,the axial area will come under dangerous area will will be less than circumferential area.So the hoop stress is more dangerous than longitudinal stress.
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