Question

Assertion (A): Transmissibility is the ratio of force applied to the force transmitted.
Reason (R): Transmissibility is a measure of effectiveness of vibration isolating material.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Transmissibility = transmitted force applied force (not the inverse).

Answer 1

The Correct Option is D

Concept: Transmissibility in vibration is defined as: \[ T = \frac{\text{Force transmitted}}{\text{Force applied}} \]

Step 1: Check Assertion (A).
Assertion states: \[ \text{Force applied} / \text{Force transmitted} \] This is inverse of correct definition. Thus Assertion (A) is incorrect.

Step 2: Check Reason (R).
Transmissibility indicates how effectively vibrations are reduced.
• Lower transmissibility → better isolation
• Higher transmissibility → poor isolation Thus Reason (R) is correct.

Step 3: Final logic.
(A) is wrong, (R) is correct. Final Answer: \[ \boxed{\text{(A) is not correct but (R) is correct}} \]