What condition must a kinematic chain satisfy to function as a working mechanism___________________?
Show answer Hide answer
Answer: B. one link should be fixed
Explanation
To function as a working mechanism, one link of a kinematic chain must be fixed. Fixing a single link establishes a grounded frame of reference for all other moving parts. Without a stationary reference link, relative motion cannot be usefully directed or constrained. A kinematic chain is an assembly of rigid links connected by joints to form a closed loop. Grubler's equation calculates mechanism mobility based on link counts and joint types. The choice of which specific link is fixed determines the resulting kinematic inversion.
Mechanism design in robotics and machinery always requires anchoring one structural base member. Engineers invert kinematic chains to create different mechanical motions from the same basic linkage. Failing to constrain at least one link results in a loose structure rather than a controlled machine. Option A suggests fixing two links, which locks the entire chain and eliminates all mobility. Option C claims no links should be fixed, leaving the assembly as a free-floating unconstrained body. Option D is incorrect because fixing one link is a mandatory criterion for functional mechanisms.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. 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...
Q2. What specific linkage configuration does a Peaucellier mechanism have__________________?
Show answer Hide answer
Answer: A. eight links
The Peaucellier-Lipkin linkage requires an interconnected arrangement consisting of exactly eight individual rigid links. This specific multi-bar geometry successfully constrains the motion to produce a mathematically pe...
Q3. What defines kinematic pairs in mechanical engineering terms___________________?
Show answer Hide answer
Answer: B. two elements having relative motion
Kinematic pairs in mechanical engineering are fundamentally defined as two machine elements having relative motion. This relative motion between connected links forms the basic building block of all mechanical mechanisms...
Q4. What kinematic parameters can be determined using Klein’s construction__________________?
Show answer Hide answer
Answer: B. acceleration of various parts
Klein's construction is specifically designed to determine linear and angular accelerations graphically. By drawing specific geometric quadrilaterals, acceleration vectors for the piston and rod are found. The primary pu...
Q5. What are open pairs defined as in the study of mechanism joints__________________?
Show answer Hide answer
Answer: C. elements of pairs not held together mechanically
Kinematic pairs that rely solely on physical contact without mechanical fastening are classified as open pairs. Gravity or external external forces typically keep the contacting elements together during their operating c...
Q6. How is the pitch point on a cam profile defined_________________?
Show answer Hide answer
Answer: B. the point on cam pitch curve having the maximum pressure angle
The pitch point on a cam profile corresponds specifically to the location on the pitch curve having maximum pressure angle. This critical point helps engineers evaluate force transmission efficiency and potential followe...