# Which of the following is CORRECT for the speed ratio of a gear train?

By Ritesh|Updated : November 1st, 2022
1. Speed of driver/speed of driven
2. Speed of driven/speed of driver
3. Number of teeth on driver/number of teeth on driven
4. None of these

The speed of the driver/speed of driving is CORRECT for the speed ratio of a gear train. The speed ratio (also known as velocity ratio) of a gear train is the proportion of the driver's speed to that of the driver or follower.

Speed ratio = ωdriver/ωdriven = ω1/ω2 = N1/N2 = T2/T1 = 1/Train Value

Train ratio = ωdriven/ωdriver

Speed:

The distance traveled in relation to the time it took to travel that distance is how speed is defined.

The formula of Speed -

s = d/t

Where,

• s is the speed in m.s-1
• d is the distance traveled in m
• t is the time taken in s

### Types of Speed

There are four different forms of speed.

• A moving object is considered to be moving at a consistent speed when it travels the same distance in the same amount of time.
• When an object travels a different distance at regular intervals, it is said to be moving at a variable pace.
• Average speed is the average speed determined by the ratio of the total distance travelled by an object to the entire amount of time it took to travel that distance.
• Instantaneous speed: The speed of an object at any given moment when it is travelling at a variable speed is referred to as the object's instantaneous speed.

Summary:

## Which of the following is CORRECT for the speed ratio of a gear train? (a)Speed of driver/speed of driven (b)Speed of driven/speed of driver (c)Number of teeth on driver/number of teeth on driven (d)None of these

The correct speed ratio for a gear train is the speed of the driver/speed of the driven. Speed is the distance which is travelled by an object based on time. The unit of speed is m/s and can be found using the formula s = d/t.