A cylindrical roller bearing is subjected to radial force of 5000 N and application factor of1.3. What is the equivalent dynamic load acting on bearing if it has 90% reliability with desired life of 20000 hrs. ?
If the load on a ball bearing is halved, its life
What is the frictional torque acting on a cylindrical roller bearing of 50 mm diameter which is subjected to radial load of 50 kN and has coefficient of friction 0.011 ?
What is the main advantage of hydrodynamic bearing over roller bearing ?
The friction torque transmitted in case of flat pivot bearing for uniform ratio of wear is equal to
The dynamic load capacity of bearing is 22KN. The maximum radial load, if it can sustain to operate at 600 rev/min, for 2000 hours is
Two identical ball bearings P and Q are operating at load 30 KN and 45 KN respectively. The ratio of the life of bearing P to the life of bearing Q is
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 × 106 revolutions, where P is equal to …..?
Which one of the following is criterion in the design of hydrodynamic journal bearings?
The most suitable bearing for carrying very heavy loads with slow speed is
The device which permits the connection and disconnection of shaft is
Which of the following statements is not true for couplings
Which clutch is known as Wet clutch?
In centrifugal clutches, when is the contact between shoe friction lining and surface of drum observed?
The inner and outer radius of friction surface of a plate clutch is 100mm and 200mm respectively. What is the ratio of maximum intensity of pressure to minimum intensity of pressure on clutch plate if magnitude of axial force is 8KN? Assume uniform wear theory.
On the motors with low starting torque, the type of the clutch to be used is
In a multiple disc clutch, if there are 8 discs on the driving shaft and 7 discs on driven shaft, the number of pair of contact surfaces will be equal to.
In a multiple disc clutch, the axial intensity of pressure is not Exceed 0.2MPa. The inner radius of the disc is 100mm and is half the outer radius. The axial force per pair of contact surfaces is.
In power screws, if friction angle is less than lead angle , then the screw undergoes-:
If friction angle is 30o then the maximum efficiency of the Screw is
The maximum efficiency of self-locking Screw is
A triple start square threaded Power Screw has torsional Shear Stress and direct Compressive Stress of 5N/mm2 and 7N/mm2. Calculate maximum shear stress induced in a screw body
If for a trapezoidal thread, angle of thread is 15o then what will be the replacement of the coefficient of friction which is 0.15
Determine torque required to overcome collar friction in square threaded Screw, if coefficient of friction is 0.12 and axial force of 20 KN is exerted by the Screw. Mean radius of friction collar is 20 mm.
If nominal diameter of Screw thread = 50 mm and Pitch = 50 mm then the mean diameter of the Screw thread will be?
