Series OSS                                                                                                                               Code No. 111

                                                            FABRICATION TECHNOLOGY – III
                                                                             (Theory)

Time allowed : 3 hours                                                                                                  Maximum Marks :40

Note : Attempt  all  questions. Draw  neat  pencil  sketches,  wherever necessary.

 

 

1. (a) What is selective assembly ?    2

    (b) Show tolerances on the shaft with a diameter of mm, and on the hole with a  diameter of mm. Sketch clearances between the two mating parts and mention the type of fit.            4

   (c) What is allowance ?    2

 

2. (a) What are the rules of designing jigs and fixtures ?    3

    (b) How does an angle plate jig differ from a channel jig ?    3

    (c) What are the advantages and disadvantages of hydraulic and pneumatic clamping over manual clamping ?    2

 

3. (a) What  are the differences between a Vernier Caliper and a Micrometer ?    3

    (b) What is a Ratchet drive ? Explain the uses and limitations of Ratchet drive.    3

    (c) Describe the uses of limit gauges with suitable sketches.    2

 

4. (a) Explain multiple sampling plan with an example.
    (b) Explain probability, with reference to inspection and quality control activities of a factory.

 

5. (a) Estimate the lathe cutting time to turn a 350 mm long mild steel bar, having 125 mm diameter, down to 120 mm diameter in two cuts with a high carbon steel tool. First cut feed is 0.75 mm/rev. and second cut feed is 0.50 mm/rev. The cutting speed of both cuts is 30 m/min.

    (b) Explain depreciation with an example.