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
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2. In hydrodynamic friction, the friction force does not depends on the lubricant viscosity.
a) True
b) False
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3. During normal engine operation there is almost no metallic contact except between the compression piston ring and cylinder walls.
a) True
b) False
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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
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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
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6. Ball and roller bearings and tappet rollers are subjected to rolling friction.
a) True
b) False
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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
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8. A circular cylindrical shaft called journal rotates against a cylindrical surface called the bearing.
a) True
b) False
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9. Total friction is negligible compared to rolling friction.
a) True
b) False
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10. The mechanical friction ___________ with increase in speed.
a) increases
b) reduces
c) unpredictable
d) none of the mentioned
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