Indicate if the following statement are false or true by cir

Indicate if the following statement are false or true by circling the right choice, T F The fundamental gear law implies that the speed ratio of the gear and pinion be constant T F Spur gears are less noisy than helical gears T F an idle gear is used to change the velocity ratio of the gear and pinion. T F the larger the backlash, the less noisy is the gear. T F helical gears arc more expensive than spur gears T F If two shafts are skewed by an angle of 10 degrees, motion can still be transferred between than using spur gears. T F Herringbone gears eliminate the need for thrust bearing T F the line of action of a gear is the common tangent to the dedendum circles T F the line of action does not necessarily pass through the pitch point at all angular positions

Solution

1. Fundamental law of gearing: Line of action must meet the line of centers at a fixed poin (pitch point) to maintain constant angular velocity ratio. F

2. Spur gear has line contact which makes it noisier than Helical gear which has point contact. F

3. Idler is used just to invert the rotation. Speed remains same. T

4. Backlash creates more noise. F

5. Helical gears are difficult to manufacture and hence costlier than spur gears. T

6. Spur gear are always used to transfer motion between parallel shaft. F

7. Herringbone gears are designed such a way that, the axis thrust is cancelled. T

8. Line of action is the common tangent to the pitch circle. F

9. Line of action passes through pitch point F