What is the circle passing through the cam pitch point with its center at the cam rotation axis called___________________?
Show answer Hide answer
Answer: C. prime circle
Explanation
The prime circle of a cam mechanism is defined as the smallest circle that can be drawn tangent to the pitch curve. Its geometric center is located precisely at the axis of cam rotation. This reference circle is essential for determining cam follower displacement and designing proper pressure angles. Cam nomenclature includes the base circle, prime circle, pitch curve, and profile curve used in mechanism synthesis. The base circle is the smallest circle drawn tangent to the cam profile, whereas the prime circle is tangent to the pitch curve. Cam designers use the prime circle as a baseline reference when calculating follower motion characteristics and lift profiles.
Pitch circle typically applies to gears rather than cams, representing the rolling circle of engagement. Base circle is the smallest circle tangent to the actual cam body profile, not the pitch curve. Outer circle and cam circle are generic non-standard terms that do not describe the specific circle tangent to the pitch point.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What type of output motion is typically delivered by a cam mechanism___________________?
Show answer Hide answer
Answer: D. all of the above
Cam mechanisms transmit motion through specially designed contoured profiles. Depending on the follower design, this profile can produce various output movements. Translating, oscillating, and rotating follower motions a...
Q2. What approximate surface hardness range is achievable through the nitriding process__________________?
Show answer Hide answer
Answer: C. 1000 to 1100 VPN
Nitriding is a thermochemical surface hardening process that diffuses nitrogen into steel components. This diffusion creates hard metal nitrides that achieve hardness values between 1000 and 1100 VPN. Such high surface h...
Q3. Does a chain consisting of 5 links and 5 joints constitute a valid kinematic chain ?
Show answer Hide answer
Answer: B. no
According to Grubler's criterion for planar mechanisms, a chain with 5 links and 5 joints lacks constrained mobility. Calculating degrees of freedom using the standard kinematic formula yields a structure that cannot mov...
Q4. Under what conditions can a completely constrained motion be transmitted__________________?
Show answer Hide answer
Answer: D. 4 links with pin joints
A four-bar chain consists of four rigid links connected by turning pin joints. This kinematic arrangement is the simplest mechanism capable of completely constrained motion. Movement of one link produces predictable, con...
Q5. As temperature decreases from 0 to l00°C, the ultimate tensile strength and yield strength of most metals will _________________?
Show answer Hide answer
Answer: A. increase
In the low-temperature range from zero to one hundred Celsius, metal strength properties increase. Reduced thermal energy at lower temperatures makes dislocation glide more difficult within the crystal lattice. This incr...
Q6. What geometric path is traced by a coupler point in a double slider crank mechanism____________________?
Show answer Hide answer
Answer: E. ellipse
A coupler point in an ellipse-generating double slider crank mechanism traces an exact elliptical path. Geometric constraints imposed by the two perpendicular sliding axes force the intermediate coupler point to follow e...