In hydrodynamic bearings_____________________?

Related Mcqs:

1. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?

   A. 0.01 micron
   B. 0.1 micron
   C. 1 micron
   D. 10 microns
   E. 25 microns

2. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?

   A. dynamic loading
   B. static loading
   C. combined static and dynamic loading
   D. completely reversed loading
   E. all of the above

3. A hot short metal is_________________?

   A. brittle when cold
   B. brittle when hot
   C. brittle under all conditions
   D. ductile at high temperature
   E. hard when hot

4. For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?

   A. same
   B. 1/2
   C. 1/3
   D. 1/4
   E. 2/3

5. A self locking screw has________________>

   A. fine threads
   B. coarse threads
   C. coefficient of friction > tangent of load angle
   D. hole for inserting split pin
   E. two nuts for locking

6. The valve rod in a steam engine is connected to an eccentric rod by_________________?

   A. cotter joint
   B. bolted joint
   C. kunckle joint
   D. universal coupling
   E. gib and cotter joint

7. In standard taper roller bearings, the angle of taper of outer raceway is___________________?

   A. 5°
   B. 8°
   C. 15°
   D. 25°
   E. 40°.

8. Basic hole is one_________________?

   A. whose upper deviation is zero
   B. whose lower deviation is zero
   C. whose lower as well as upper deviations are zero
   D. does not exist
   E. none of the above

9. Split nut is a locking device in which_________________?

   A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
   B. a slot is cut partly in middle of nut and then slot reduced by tightening screw
   C. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
   D. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
   E. none of the above

10. The designation M 33 x 2 of a bolt means___________________?

    A. metric threads of 33 nos in 2 cm.
    B. metric threads with cross-section of 33 mm
    C. metric threads of 33 mm outside diameter and 2 mm pitch
    D. bolt of 33 mm nominal diameter having 2 threads per cm
    E. none of the above