How is the angle of dwell of a cam defined________________?
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Answer: C. through which the cam rotates during the period in which the follower remains in the highest position
Explanation
The dwell angle is the interval of cam rotation during which the follower remains stationary. During this specific phase, the follower stays locked at its highest position without moving. Cam profile designers specify this angle to ensure pauses occur at required operational intervals. Cams are rotating mechanical elements that impart complex motion to followers through direct contact. Cam rotation is measured in angular degrees over a full three hundred sixty-degree cycle. Follower motion phases include rise, dwell, return, and secondary dwell periods.
Internal combustion engine valves remain fully open during specific cam dwell intervals for optimal breathing. Automated packaging machinery uses cam dwell periods to hold items steady while sealing operations occur. Accurate dwell angle design prevents valve float and mechanical slamming in high-speed machinery. Option A describes the return stroke interval rather than the stationary high-position dwell period. Option B refers to general displacement rotation angles rather than the specific highest-position pause. Option D defines the ascent phase where the follower actively rises toward maximum displacement.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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