Q.1
The hydrodynamic friction is associated with the phenomena when a complete film of lubricant exists between the two bearing surfaces.
  • a) True
  • b) False
Q.2
In hydrodynamic friction, the friction force does not depends on the lubricant viscosity.
  • a) True
  • b) False
Q.3
During normal engine operation there is almost no metallic contact except between the compression piston ring and cylinder walls.
  • a) True
  • b) False
Q.4
During starting of the engine, the journal bearings operate in ____________ friction.
  • a) rolling
  • b) hydrodynamic friction
  • c) partial-film
  • d) none of the mentioned
Q.5
The ____________ friction is due to rolling motion between the two surfaces.
  • a) rolling
  • b) hydrodynamic friction
  • c) partial-film
  • d) none of the mentioned
Q.6
Ball and roller bearings and tappet rollers are subjected to rolling friction.
  • a) True
  • b) False
Q.7
Rolling friction coefficient is ____________ than journal bearing friction coefficient during starting and initial running of engine.
  • a) higher
  • b) lower
  • c) faster
  • d) none of the mentioned
Q.8
A circular cylindrical shaft called journal rotates against a cylindrical surface called the bearing.
  • a) True
  • b) False
Q.9
Total friction is negligible compared to rolling friction.
  • a) True
  • b) False
Q.10
The mechanical friction ___________ with increase in speed.
  • a) increases
  • b) reduces
  • c) unpredictable
  • d) none of the mentioned
0 h : 0 m : 1 s