GTU previous years question papers -BE- Sem-III -Manufacturing Process-I -Dec 2009

GTU previous years question papers

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. Sem-III Examination December 2009

Subject code: 131903

Subject Name: Manufacturing Process-I

 

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Explain different taper turning methods. 05

(b) Write short note on different type of chucks used in a lathe. 05

(c) Explain different operations performed with the help of a lathe. 04

Q.2 (a) Explain different factors affecting the tool life. A cutting tool cutting at 22 m/min, gave a life of 60 minutes between regrinds when operating on roughening cuts with mild steel. What will be its probable life when engaged on light finishing cuts? Take n = 1/8 and 1/10 for roughening and finishing cuts respectively in Taylor’s tool life equation.

(b) Explain single point cutting tool geometry. 03

(c) Explain hydraulic shaper mechanism. 07

OR

(c) Explain crank and slotted link quick return mechanism in a shaper. 07

Q.3 (a) Explain different types of reamers used in drilling. 05

(b) Explain instruments used in the alignment test of a lathe. 05

(c) Explain jig boring machine. 04

OR

Q.3 (a) Explain different types of milling cutters. 05

(b) Explain different indexing methods used in milling machine. 05

(c) Index for 87 divisions with the help of compound indexing. 04

Q.4 (a) Explain grinding wheel designation system. 05

(b) Differentiate between centre type and centre less grinding machines. 05

(c) Explain Trueing and Dressing of grinding wheel. 04

OR

Q.4 (a) Explain basic methods of milling. 05

(b) Explain the slotted disc mechanism in slotting machine. 05

(c) Differentiate between a shaper and a planer. 04

Q.5 (a) Write advantages, limitations and applications for broaching. 05

(b) Explain different types of saw bands in sawing machine. 05

(c) Explain different operations performed with the help of a drilling machine.

OR

Q.5 (a) A work piece 200 mm x 300 mm is to be machined on a shaper.

Calculate the machining time by considering following parameters.

Cutting speed = 10 m/min.

Return speed = 20 m/min.

Feed = 5 mm/full stroke.

Clearance at each end = 50 mm.

(b) A hole of 25 mm diameter and 62.5 mm depth is to be drilled. The

suggested feed is 1.25 mm/rev.and the cutting speed is 60 m/min.

Assume the clearance height is 5 mm. Determine: feed speed,

spindle rpm, cutting time and Material removal rate.

(c) A 150 mm long 12.7 mm diameter stainless steel rod is being turned

to 12.19 mm diameter on a centre lathe. Spindle speed = 400

rev./min.

Axial speed = 203.20 mm/min.

Determine: cutting speed, Material removal rate and Machining

time.

 

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