What is it called when links are joined such that relative motion is not restricted to a single direction_______________?
Show answer Hide answer
Answer: A. incompletely constrained motion
Explanation
When links are joined such that relative motion is not restricted to a single direction, it is incompletely constrained. This lack of directional restriction means the mechanism can move in multiple unpredictable ways unless modified. Incompleted constraints prevent machines from performing precise, repeatable mechanical tasks reliably. Kinematic constraints categorize relative motion into completely, partially, or incompletely constrained types. Adding external guides, pins, or constraints transforms incompletely constrained assemblies into functional mechanisms. Degrees of freedom calculations help engineers identify whether a mechanical assembly lacks necessary motion restrictions.
Machine designers avoid incompletely constrained joints to prevent erratic operation and rapid mechanical wear. Robotic joints require proper constraint to ensure end effectors follow exact programmed spatial trajectories. Loose tolerances in poorly designed pin joints can introduce unwanted degrees of freedom into assemblies. Partially constrained motion restricts movement in some directions while leaving others free under specific loads. Completely constrained motion restricts relative movement to a single predictable path without ambiguity. Successfully constrained motion uses external forces or gravity to maintain proper contact in higher pairs.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What type of governor is commonly used in gramophone turntables for speed regulation_______________?
Show answer Hide answer
Answer: C. Pickering governor
The Pickering governor is a spring-loaded centrifugal governor designed for gramophone turntables. It regulates rotational speed accurately using flyweights restrained by calibrated hairsprings. This compact governing me...
Q2. In its most basic form, how many links comprise a standard cam mechanism___________________?
Show answer Hide answer
Answer: C. 3
A standard cam mechanism consists of three basic links interacting to produce complex motion. These essential components include the rotating cam, the translating follower, and the stationary frame. Removing any of these...
Q3. For what crank positions can Klein’s graphical construction be used to determine accelerations_________________?
Show answer Hide answer
Answer: E. all of the above
Klein's construction provides a purely geometric method to find slider-crank accelerations. The graphical construction works for any arbitrary crank angle position throughout rotation. Dead centers and right-angle positi...
Q4. What coupling is used to connect two parallel shafts whose axes are close together and relative position is variable_______________?
Show answer Hide answer
Answer: C. Oldham’s coupling
Oldham’s coupling is specifically used to connect two parallel shafts whose axes are close together. It accommodates variable relative positions between the two parallel rotating shafts smoothly. A central floating disk...
Q5. How are kinematic pairs defined based on their contact characteristics__________________?
Show answer Hide answer
Answer: D. two elements that permit relative mo-tion
Kinematic pairs are fundamentally defined as two elements that permit relative motion between them. This relative motion constraint distinguishes mechanical linkages from rigid standalone structural components. The conne...
Q6. Under what operating conditions is Klein’s construction applicable_________________?
Show answer Hide answer
Answer: A. crank has a uniform angular velocity
Klein's construction assumes the driving crank rotates with constant angular velocity. This assumption simplifies the geometric acceleration polygon by eliminating angular acceleration terms. The construction uses the cr...