43) The depth of the tooth space of a gear below the pitch circle is called

Answer is:

Dedendum

Explanation:

The depth of the tooth space of a gear below the pitch circle is called as Dedendum

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44) In which among the following gearing the axial thrust is minimized ?

Answer is:

Herringbone gearing

Explanation:

When two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft called spur gears, the arrangement is known as spur gearing.

Another name given to the spur gearing is helical gearing in which the teeth are inclined to the axis of the shaft. There are single and double helical gears. The double helical gears are known as herringbone gears. In Herringbone gearing the axial thrust is minimized.

In which among the following gearing the axial thrust is minimized ?

45) A gear of which the general form is cylindrical and teeth are parallel to centre line is

Answer is:

Spur gear

Explanation:

When two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft called spur gears, the arrangement is known as spur gearing.