Question

24.Which of the following statement is correct for gears?. Single choice.

(2 Points)

The addendum is less than the dedendum

The pitch circle diameter is the product of module and number of teeth

The contact ratio means the number of pairs of teeth in contact

All of the above​

Answer 1

Answer:

All of the above.

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Answer 2

Answer:

The correct option is : All of the above.

Explanation:

Reasons why all three options are correct :

a) Option 1

• Addendum must be smaller than dedendum since it measures the distance from the pitch circle to the teeth's head.

b) Option 2

• The diameter of a standard pitch circle, also known as a pitch circle or standard circle, is calculated as the product of the number of teeth and the module.
• The pitch circle's diameter is given by d = zm, where z is the number of teeth and m is the module.
• In order to identify the shafts of two matching gears, it is crucial to know the pitch circle diameters.

c) Option 3

• The mean number of teeth coming into touch with each other during transmission is known as the Contact Ratio (CR).
• When the ratio is between 2 and 3, 2 or 3 sets of teeth are constantly in touch.
• The meshing of internal gears, helical gears, or carefully designed nonstandard external spur gears can produce a high ratio that is often not possible with external spur gears.

Therefore, all the given options are true for gears.

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