Related MCQs

• Fatigue life of a material for a fully reversed loading condition is estimated from _a = 1100 N^0.15 where _a 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 1 10⁵ 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^1/3 = 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 ______.
• Z₂ and Z₄ 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 10⁶ revolutions, where P is equal to _________
• A self-aligning ball bearing has a basic dynamic load rating (C₁₀, for 10⁶ revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in 10⁶ revolutions) is
• At a critical point in a component, the state of stress is given as _xx = 100 MPa, _yy = 220 MPa, _xy = _yx = 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; _x = 80 MPa; _y = 20 MPa; _x = 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>