(MME-564) Page 1 of 1

Reg. No.

II SEM. M. TECH. (CAMDA) DEGREE END SEMESTER EXAMINATIONS MAY 2014

SUBJECT: INDUSTRIAL TRIBOLOGY (MME 564)

Time: 3 Hours MAX.MARKS: 50 1A) 1B)

Discuss the following physical properties of mineral oils (i) Viscosity Index (ii) Extreme pressure property (iii) Fire point (iv)Drop point (v) Specific heat What is the significance of each property in the hydrodynamic lubrication of bearings. From first principles derive the continuity equation for a fluid with

density and flowing with velocities u, v, and w along the x, y and z axes respectively.

(05) (05)

2A) Starting with the Reynolds equation for the short journal bearing derive an expression for the axial pressure distribution. Sketch the variation of pressure in the axial direction.

(05)

2B)

What is hydrodynamic instability? Describe some of the bearing designs that are used to counter the effect of hydrodynamic instability.

(05)

3A) Derive an expression for the load capacity and flow in a circular step thrust externally pressurized fluid film bearing.

(05)

3B) Write a note on the numerical solution of Finite Journal Bearings, bringing out the salient points in the solution method.

(05)

4A) Write a note on ISO standards for rolling element bearings (04) 4B) Describe the materials and the manufacturing methods used in rolling

element bearings. (06)

5A) Stating the laws of frictions, briefly explain the various friction theories (04)

5B) Explain the following with neat sketches with regard to rolling element bearings

1. Diametral clearance 2. Inner and outer race conformities as well as total conformity 3. Endplay

(06)

6A) Explain different mechanisms of wear (05)

6B) With a neat sketch explain the working of electron microscope. (05)

MANIPAL INSTITUTE OF TECHNOLOGY Manipal University, Manipal – 576 104

Instructions to Candidates: Answer ANY FIVE FULL questions.

Additional data required, if any, may be appropriately assumed.