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**61) **In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

**Answer is:**

## 0.6

**Related KPCL AE Mechanical Question Paper - 2018 with Answer Key**

**Answer is:**

### Slip gauge

**Answer is:**

### Two masses in any two planes

**Answer is:**

### A physical property of the material

**Explanation:**

Thermal diffusivity is defined as the ratio of the thermal conductivity to the heat capacity of a material and it measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. Thermal diffusivity is a physical property of the material.