Which of the following types of brakes is commonly used in railroad trains and trailers?

Pneumatic brakes

Hydraulic brakes

Both (A) and (B)

None of these

80

120

180

None of these

It is the sidewall height as a percentage of the inner diameter of the tire.

It is the sidewall height as a percentage of the radius of the tire.

It is the sidewall height as a percentage of the total width of the tire.

None of these

Helical gears

Spur gears

Worm gears

None of these

Body friction

Dynamic friction

Angular friction

None of these