semech question bank1

SINHGAD TECHNICAL EDUCATION SOCIETYSSmt. Kashibai Navale College of Engineering

MANUFACTURING PROCESSES2009-2010

UNIT-ICASTING PROCESSES

------------------------------------------------------------------------------------------------------------Q.1

(a)Sketch a cupola and label the essential parts. Explain in brief different zones in Cupola. (R1)

[8]

(b) Explain the centrifugal casting process for production of cast iron pipes. [8]OR

Q.2 (a)Explain with neat sketch the different types of cores used in foundry. Give significance of color code for cores.

[8]

(b)With a neat sketch, explain the construction and working of a jolt squeezing Mouldig machine.

[8]

Q.3 (a)State the principle of centrifugal casting and state its advantages and limitations.

[6]

(b) Explain in brief various allowances provided on pattern (R1) [5](c) Write the procedure for permeability test for moulding sand [5]

ORQ.4 (b) Write on investment casting. [5]

(c) Describe the injection moulding process. [5]

Q.5 (a)What do you understand by core, core point and core box ? Explain in short types of core-boxes.

[5]

(b) Discuss different types of casting defects. [6]OR

Q.6 (a) Draw neat sketch of cupola. Explain the heat zones with the chemistry. [6](b) What is plastic? Explain any one plastic moulding process. [6](c) Explain Die casting process in brief. [4]

Q.7 (A) Explain the following types patterns with figure. [8]i Loose-piece pattern. ii Gated pattern.iii Sweep pattern.iv Skeleton pattern.

(B) Explain the following defects with their remedies. [6](i) Blow holes.(ii) Scabs.(iii) Cold shuts.(C) Explain the function of ‘Riser’ with figure. [4]

ORQ.8 (A) Explain pattern making allowance in detail.

(B) Describe ‘Gating System’ in casting with suitable sketch.(C) Describe ‘Centrifugal Casting’ process with suitable sketch are also explain its

various types. [6]

Q.9 (a) Write down the important properties of a good pattern material. [4](b) Sketch and describe a loose piece pattern pattern for making a sand mould. [4](c) Explain the construction and working of hot chamber die casting process. State the [8

Second Year Mech Engg. 1



advantage and limitations of the process. ]OR

Q.10 (a) What are the function of additives in moulding sand? [4] (b) Sketch and explain transfer process for plastic. (c) Explain with neat sketches:(i) True centrifugal casting.(ii) Continuous casting.




UNIT-II –Hot working and cold working processes

Q.1 (a) Describe with the help of a neat sketch a Board-Drop hammer used

for drop Forging . State their relative merits (R-1)

[8]

(b) Describe the following processes:

(i) Shot peening

(ii) Wire drawing. (R-1) [8]

Or

Q.2 (a) What are the varies operations which can be performed on sheet metal

using presses ? [8]

(b) Sketch and describe a progressive die used on presses. [8]

Q.3 (a) What is roll forging? What for is it used ? [8]

(b) How does direct extrusion differ from indirect extrusion ? Discuss

their Relative merits and demerits. (R-1) [6]

(c) What is meant by ‘cold working process’ ? List different cold

working Processes along with their applications . (R-1) [5]

Or

Q.4 (a) What is impact extrusion ? Explain the process and state specific

applications. [6]

(b) Descibe the process of wire-drawing. [5]

Q.5 (a) How does roll forming process differ from spinning process ? [4]

Or

Q.6 (a) Explain with the help of figure the process of Rotary Swaing name

the Different components produced by it. [6]

(b) Describe press forging process .How does it differe from drop

forging?

[6]

Q.7 (a) Difference between hot rolling and cold rolling. [4]

(b) Expalin forward extrusion and backword extrusion process with

figure.

[6]

Or

Q.8 (a) Write short notes on the following : [8]




UNIT-III

JOINING PROCESS

Q.1 (a) Describe the following welding process: [10]

(ii) Gas tungsten arc welding (GTAW)

(b) Differentiate between soldering and brazing operations. (R2) [8]OR

Q.2 (a) Describe the following welding processes stating their applications: [10](i) Submerged are welding.(ii) Plasma welding.(b) Explain with sketches different joints and edge preparations used in welding

operations. State the importance of edge preparation. [8]

Q.3 (a) What is resistance welding? Explain the types of resistance welding. [6](b) Compare A.C. Arc welding with D.C. Arc welding process.(R1) [6]

ORQ.4 [6]

(a) Write a note on Adhesives and state their applications. [6](b) Enumerate the different types of flames used in gas welding. [6]

Q.5 (a) Describe the following processes with their application (any two) [8](i) Projection welding.(ii) Spot welding.(b) Differentiate between forward and backward gas welding techniques. [5]

[5]OR

Q.6 (a) Describe different types of flames used in gas welding along with their applications. [8](b) Mention with sketch different types of joints used in adhesive joining. [5]

Q.7 (a) Explain submerged arc welding process with suitable sketch [6](b) Describe the following resistance welding processes: [6](i) Spot welding.(ii) Projection welding.(c) Write difference between ‘TIG’ and ‘MIG’ [4]

ORQ.8 [6]

(a) Describe different types of gas flames used in gas welding. [6]




Q.9 (a) What is the purpose of coating on an are welding electrode? [4](b) Distinguish between “Brazing” and “Braze welding”. [4](c) Explain the following electric arc welding processes with the help of neat sketches: [10](i) Flux-Cored Arc welding [FCAW].(ii) Gas Metal Arc welding [GMAW].

ORQ.10 (a) What are the special features of Resistance Projection Welding? [4]

(b) With the help of neat sketches explain the following welding methods: [10]




UNIT-V

MILLING ,DRILLING PLANNING & BORING MACHINE

Q.1(a) Draw a neat sketch of universal milling machine and label different parts. State the

function of each one. [8]

(b) Sketch and describe various operations which can be performed on drilling machines.

[8]

OR

Q.2(a) With the help of sketch, explain the construction and working of radial drilling

machine. [8]

(b) With a neat sketch explain the following operations: [8](i) Straddle milling.(ii) Cam milling.

Q.3 (a) Calculate Compound Indexing for 87 divisions. The hole circles available are: (R2) [6]Plate I : 15,16, 17, 18, 19, 20.Plate II : 21, 23, 27, 29, 31, 33.Plate III : 37, 39, 41, 43, 47, 49.

(b) Differentiate between upmilling and downmilling machine (R2) [5](c) How do you classify the various milling cutters ? Explain. [5]

ORQ.4 (a) Sketch and describe in brief a sensitive drilling machine. [6]

(b) What operations do you perform on a drilling machine ? Describe them in brief [5](c) Sketch a reamer and show the various terms related to it.(R1) [5]

Q.5(a) Draw a block diagram of a multi-spindle drilling machine and state how it differs

from a gang machine.[8]

(b) Describe with sketch nomenclature of a twist drill [4]

Q.6 (a) Draw a neat sketch to show construction of dividing head explain its working.(b) Calculate index crank movement to divide 57 division by us compound indexing.

OR

Q.7(a) Draw a neat sketch of twist drill with its nomenclature explain various

terminologies of twist drill. (b) Explain the following drilling operations with sketches.(i) Counterboaring (ii) Spot facing.(iii) Tapping.(c) Differentiate between Boring and Reaming Operation.

Q.8 (b) Sketch and describe a self-centering chuck for drilling machine.(c) Differentiate between:




(i) Gang Milling and straddle Milling.OR

Q.9 (a) Describe with a neat sketch a plain milling cutter.(b) Differentiate between gang drilling machine and multiple spindle drilling machine.(c) With the help of a sketch, explain the construction and work of radial drilling

machine.




UNIT VIGRINDING MACHINE

Q.1 (a) Describe standard marking system of grinding wheel. (R3) [10](b) Compare Honing, Lapping and Super-finishing operations. (R1) [8]

ORQ.2 (a) Explain with sketch the principle of : [10]

(i) Internal centerless grinding. (R1)(ii) External centreless grinding.(R1)(b) Write short notes on : [8](i) Tool and cutter grinder. (R1)(ii) Honing process.(R1)

Q.3(a) Explain the principles of centerless grinding. State its merits and demerits over

other types of grinding. (R1) [6]

(b) Why are ‘Truing’ and ‘Dressing’necessary in grinding wheel ? (R1) [6](c) What do you understand from ‘Grain’, ‘Grit’, ‘Structure’, and ‘Grade’ of a grinding

wheel ? Explain.(R3) [6]

OR

Q.4(b) With the aid of a neat sketch explain construction and working of tool and cutter

grinder. State its applications.[6]

(c) Make a neat sketch of horizontal wheel spindle and reciprocating table surface grinder and explain its operations.

[6]

Q.5(a) Explain in details the operating faults of a grinding wheel are give remedies to these

faults.[6]

(b) Explain with a neat sketch ‘mounting of grinding wheels’. [5] OR

Q.6 (a) Explain the following terms: [5](iii) Loading.(iv) Glating.(b) Differentiate between honing and lapping operations.

Q.7(a) Hard grinding wheel used for the soft work material and soft grinding wheel used

for hard work material. Comment. [6]

(b) Explain loading and glazing of grinding wheel. [6]Q.8 (a) Differentiate between glazing and loading of grinding wheel. [6]

(c) Write short notes on: (i) External and Internal centerless grinding process (ii) Surface grinders.

ORQ.9 (a) Explain the factors in the selection of grinding wheels. [4]




UNIT-IV-Centre Lathe Machine

Q.1 (a) List different accessories used on lathe and state the purpose of each with neat sketch. [8]

(b) List the various taper turning methods on lathe and explain the taper turning attachment with sketch. [8] Or

Q.2 (a) With the help of sketch , explain the working of all geared headstock of lathe stating its advantages and limitations. (R-1) [8]

(b) How multistart screw threads are cut on lathe ? Calculate the change gears for L.H.threads of 2 mm pitch on a lathe having lead screw of 6 mm pitch.Available change gears are with 20 teeth to 120 teeth in steps of 5 teeth. (R-1) [8]

Q.3 (a) Write a note on set-over method of taper turning . (R-1) [6](b) Name different work holding devises used on lathe and state their

typical applications. (R-1) [5](c) Draw a sketch of single point cutting tool ,mention all angels. (R-2) [5]

OrQ.4 (a) What is lathe carriage?Explain its various parts with the help of sketch. [6]

(b) Calculate the amount of off-set of tail-stock for turning taper on full length of a job 100mm long to have its two diameters as 50mm and 40mm. [5]

(c) Draw a neat sketch of tailstock and name the parts . (R-1) [5]Q.5 (a) Explain the sketch ‘thread cutting operation’. (R-1) [6]Q.6 (a) Explain the following lathe accessories with suitable sketch: [8]

(i) Driving plate(ii) mandrels.

(b) Diffrentiate between single start and multistart theards. [4] Or

Q.7 (a) Explain any one taper turning method with suitable sketch,also explain its advantages.

[6]

(b) Explain the following lathe operations :(i)Chamfering (ii) Knurling (iii) Grooving.

[6]

Q.8 (a) Find the angle at which the compound rest should be set up to turn taper on the workpiece having a length of 200mm, larger diameter 45mm, and the smaller diameter 30mm.

(b) State the function of the following in lathe :(i) Follower rest (ii) Live centre (iii) Half centre (iv) Tumbler gears. [4] Or

Q.9 (a) What is the difference between ‘face plate’ and a ‘drive plate’ ?




(b) Find the setting required for turning a taper of 85mm diameter to 75mm diameter over a length of 200mm,while the length of the job is 300mm between centres .Tailstock offset be used for generating the prescribed taper.

(c) Describe with neat sketch :(i) Apron mechanism of a lathe (ii) Geometry of a single point cutting tool.


semech question bank1

Documents