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**19) **For a cemented carbide turning tool, Tailor's tool life exponent is 0.25. If the cutting speed halved, the tool life will increase by

**Answer is:**

## Sixteen times

**Related ISRO Technical Assistant Mechanical Question Paper - 2017 with Answer Key**

**Answer is:**

### Diesel cycle

**Answer is:**

### Remains constant

**Answer is:**

### Surface tension force

**Explanation:**

The important dimensionless numbers in fluid mechanics are

1. Reynold’s number

2. Froude’s number

3. Weber’s number

4. Euler’s number

5. Mach’s number or Cauchy’s number

**Reynold’s number**: Reynold’s number is the ratio of inertia force to the viscous force.

**Froude’s number**: Froude’s number is the ratio of inertia force to the gravity force.

**Weber’s number**: Weber’s number is the ratio of inertia force to the surface tension force.

**Euler’s number**: Euler’s number is the ratio of inertia force to the pressure force.

**Mach’s number or Cauchy’s number**: Mach’s number or Cauchy’s number is the ratio of inertia force to the elastic force.