# IC Engine Questions and Answers – Mechanical Friction

«
»

This set of IC Engine Assessment Questions and Answers focuses on “Mechanical Friction”.

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

Explanation: None.

2. In hydrodynamic friction, the friction force does not depends on the lubricant viscosity.
a) True
b) False

Explanation: In fact, in hydrodynamic friction, the friction force entirely depends on the lubricant viscosity.

3. During normal engine operation there is almost no metallic contact except between the compression piston ring and cylinder walls.
a) True
b) False

Explanation: None.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

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

Explanation: None.

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

Explanation: None.

6. Ball and roller bearings and tappet rollers are subjected to rolling friction.
a) True
b) False

Explanation: None.

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

Explanation: None.

8. A circular cylindrical shaft called journal rotates against a cylindrical surface called the bearing.
a) True
b) False

Explanation: None.

9. Total friction is negligible compared to rolling friction.
a) True
b) False

Explanation: No, but rolling friction is negligible compared to total friction.

10. The mechanical friction ___________ with increase in speed.
a) increases
b) reduces
c) unpredictable
d) none of the mentioned

Explanation: Mechanical friction is directly proportional to engine speed, so mechanical friction increases with an increase in speed.

Sanfoundry Global Education & Learning Series – IC Engine.

To practice all areas of IC Engine Assessment Questions, here is complete set of 1000+ Multiple Choice Questions and Answers.