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 FL1/3 = 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 Bearing-typeLoading condition(a) Ball bearing (p) Tangential load(b) Roller bearing (q) Radial load (c) Needle bearing(r) Heavy radial load with impact(d) Taper roller bearing(s) Light radial load with space limitation(t) Heavy radial and axial load (u) Fatigue load
• Match the type of gears with their most appropriate description. Type of gearsDescriptionP. Helical1. Axes non parallel and non intersectingQ. Spiral Bevel2. Axes parallel and teeth are inclined to the axisR. Hypoid3. Axes parallel and teeth are parallel to the axisS. Rack and pinion4. Axes are perpendicular and intersecting, and teeth are inclined to the axis5. Axes are perpendicular and used for large speed reduction6. Axes parallel and one of the gears has infinite radius
• Match the following Type of gearsArrangement of shaftsP. Bevel gears1.Nonparallel offset shaftsQ. Worm gears2.Nonparallel intersecting shaftsR. Herringbone 3. Nonparallel, non -intersecting shafts S. Hypoid gears4.Parallel shafts