Given that the tooth geometry factor is 0.32 and the combined effect of dynamic load and allied factors intensifying the stress is 1.5; the minimum allowable stress (in MPa) for the gear material is

Given that the tooth geometry factor is 0.32 and the combined effect o

1.	Given that the tooth geometry factor is 0.32 and the combined effect of dynamic load and allied factors intensifying the stress is 1.5; the minimum allowable stress (in MPa) for the gear material is
A.	242.0
B.	166.5
C.	121.0
D.	74.0
Answer» C. 121.0

Discussion

No Comment Found

Related MCQs

Fatigue life of a material for a fully reversed loading condition is estimated from <sub>a</sub> = 1100 N<sup> 0.15</sup> where <sub>a</sub> is the stress amplitude in MPa and N is the failure life in cycles. The maximum allowable stress amplitude (in MPa) for a life of 1 10<sup>5</sup> cycles under the same loading condition is_______(correction to two decimal places).
For ball bearings, the fatigue life L measured in number of revolutions and the radial load P are related by FL<sup>1/3</sup> = K, where K is a constant. It withstands a radial load of 2 kN for a life of 540 million revolutions. The load (in kN) for a life of one million revolutions is ______.
Z<sub>2</sub> and Z<sub>4</sub> are
Ball bearings are rated by a manufacturer for a life of 106 revolutions. The catalogue rating of a particular bearing is 16 kN. If the design load is 2 kN, the life of the bearing will be P x 10<sup>6</sup> revolutions, where P is equal to _________
A self-aligning ball bearing has a basic dynamic load rating (C<sub>10</sub>, for 10<sup>6</sup> revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in 10<sup>6</sup> revolutions) is
At a critical point in a component, the state of stress is given as <sub>xx</sub> = 100 MPa, <sub>yy</sub> = 220 MPa, <sub>xy</sub> = <sub>yx</sub> = 80 M Pa and al l ot her st r ess components are zero. The yield strength of the material is 468 MPa. The factor of safety on the basis of maximum shear stress theory is_____ (round off to one decimal place).
A machine element is subjected to the following bi-axial state of stress; <sub>x</sub> = 80 MPa; <sub>y</sub> = 20 MPa; <sub>x</sub> = 40 MPa. If the shear strength of the material is 100 MPa, the factor of safety as per Tresca's maximum shear stress theory is
Match the rolling element bearings with the most appropriate loading condition <br><table class="wp-block-table"><tbody><tr><td><strong>Bearing-type</strong></td><td><strong>Loading condition</strong></td></tr><tr><td>(a) Ball bearing </td><td>(p) Tangential load</td></tr><tr><td>(b) Roller bearing </td><td>(q) Radial load </td></tr><tr><td>(c) Needle bearing</td><td>(r) Heavy radial load with impact</td></tr><tr><td>(d) Taper roller bearing</td><td>(s) Light radial load with space limitation</td></tr><tr><td></td><td>(t) Heavy radial and axial load </td></tr><tr><td></td><td>(u) Fatigue load </td></tr></tbody></table>
Match the type of gears with their most appropriate description. <br><table class="wp-block-table"><tbody><tr><td><strong>Type of gears</strong></td><td><strong>Description</strong></td></tr><tr><td>P. Helical</td><td>1. Axes non parallel and non intersecting</td></tr><tr><td>Q. Spiral Bevel</td><td>2. Axes parallel and teeth are inclined to the axis</td></tr><tr><td>R. Hypoid</td><td>3. Axes parallel and teeth are parallel to the axis</td></tr><tr><td>S. Rack and pinion</td><td>4. Axes are perpendicular and intersecting, and teeth are inclined to the axis</td></tr><tr><td></td><td>5. Axes are perpendicular and used for large speed reduction</td></tr><tr><td></td><td>6. Axes parallel and one of the gears has infinite radius</td></tr></tbody></table>
Match the following <br><table class="wp-block-table"><tbody><tr><td><strong>Type of gears</strong></td><td><strong>Arrangement of shafts</strong></td></tr><tr><td>P. Bevel gears</td><td>1.Nonparallel offset shafts</td></tr><tr><td>Q. Worm gears</td><td>2.Nonparallel intersecting shafts</td></tr><tr><td>R. Herringbone</td><td> 3. Nonparallel, non -intersecting shafts </td></tr><tr><td>S. Hypoid gears</td><td>4.Parallel shafts</td></tr></tbody></table>

Given that the tooth geometry factor is 0.32 and the combined effect of dynamic load and allied factors intensifying the stress is 1.5; the minimum allowable stress (in MPa) for the gear material is

Discussion

No Comment Found

Related MCQs

Reply to Comment