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For an involute gear with pressure angle φ, the ratio of pitch circle...

Q.  
For an involute gear with pressure angle φ, the ratio of pitch circle radius to base circle radius is


Answer & Explanation

Let r be the pitch circle radius and r' be the base circle radius,\nr' = r.cosφ\ni.e. r/r' = 1/cosφ = secφ\n

Thus correct option is: C.

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More Questions Theory of Machines:

Q.  
In involute gears, the pressure angle is

A. Dependent on the size of teeth

B. Dependent on the size of gears

C. Always constant

D. Always variable


Answer & Explanation

Q.  
Which one of the following is true for involute gears?

A. Interference is inherently absent

B. Variation in center distance of shafts increases radial force

C. A convex flank is always in contact with concave flank

D. Pressure angle is constant throughout the teeth engagement


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Q.  
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

A. Tip of the gear and flank of pinion

B. Tip of the pinion and flank of gear

C. Flanks of both gear and pinion

D. Tips of both gear and pinion


Answer & Explanation

Q.  
The work surface above the pitch surface of the gear tooth is termed as

A. Addendum

B. Dedendum

C. Flank

D. Face


Answer & Explanation
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