# IC Engine Questions and Answers – Engine Friction

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This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “Engine Friction”.

1. The bearing friction includes the friction due to the main bearing connecting rod bearing and other bearings.
a) True
b) False

Explanation: None.

2. Bearing friction is viscous in nature and does not depends upon the oil viscosity, the speed, size and geometry of the journal.
a) True
b) False

Explanation: No, actually, bearing friction is viscous in nature and depends upon the oil viscosity, the speed, size and geometry of the journal.

3. The valve gear friction losses vary with the engine design variables and no general equation is available predicting them.
a) True
b) False

Explanation: None.
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4. The blow by losses is the phenomenon of leakage of combustion products past the piston and piston rings from the cylinder to the crankcase.
a) True
b) False

Explanation: None.

5. Blow by losses depend on the outlet pressure and compression ratio.
a) True
b) False

Explanation: In fact, blow by losses depends on the inlet pressure and compression ratio.
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6. Blow by losses vary as the square root of inlet pressure, and increases as the compression ratio are ____________
a) increased
b) reduced
c) unpredictable
d) none of the mentioned

Explanation: None.

7. Blow by losses are reduced as the engine speed is ____________
a) increased
b) reduced
c) unpredictable
d) none of the mentioned

Explanation: Blow by losses are indirectly proportional to engine speed and it is reduced as the engine speed is increased.

8. A rise in cooling water temperature ____________ engine friction through its effect on oil viscosity.
a) increases
b) reduces
c) unpredictable
d) none of the mentioned

Explanation: None.

9. Higher the oil viscosity ____________ is the friction loss.
a) lower
b) greater
c) unpredictable
d) none of the mentioned

Explanation: Viscosity is proportional to friction loss, so higher the oil viscosity greater is the friction loss.

10. As the load increases the maximum pressure in the cylinder has a tendency to increase slightly.
a) True
b) False

Explanation: None.

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